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Work out how many wallpaper rolls your room needs. Free calculator handles pattern repeats, doors, windows, paste, and liner. Get your roll count fast. Unit System Imperial (in / ft / ft²)Metric (mm / m / m²) Wall Details Wall Input Mode Room PerimeterSingle Wall (L × H)Direct Area Entry Number of Identical Walls walls Room Length ft Room Width ft Wall Height ft Sides to Cover All 4 Walls3 Walls (One Open)2 Walls (Opposite)1 Wall Wall Length ft Wall Height ft Total Wall Area ft² Total Wall Perimeter (for trim) ft Openings to Deduct Number of Doors doors Door Width ft Door Height ft Number of Windows windows Window Width ft Window Height ft Deduct Openings? Yes — Standard PracticeNo — Install Around (Extra Paper) Wallpaper Specification Wallpaper Type Standard Roll — US (20.5″ × 33 ft)US Double Roll (20.5″ × 66 ft)Euro Roll (21″ × 33 ft)Metric Roll (0.53 × 10.05 m)Wide Metric Roll (1.06 × 10.05 m)Custom Roll Size Roll Width in Roll Length ft Pattern Type Random / No Matching (Free Match)Straight Across (Horizontal Match)Offset / Drop Match (Half-Drop) Pattern Repeat in Extra / Waste Factor % Surface Prep & Installation Wall Liner / Primer No — Apply DirectlyYes — Wall LinerYes — Primer / Sizing Paste Coverage per Roll rolls Adhesive Type Ready-Mixed PastePowder (Mix-Your-Own)Peel & Stick (Self-Adhesive) Cost Details Wallpaper Cost per Roll $ Wall Liner / Primer per ft² $ Paste per Unit $ Tools & Supplies $ Labor / Hanging Cost $ Additional Cost $ Summary Detailed Breakdown Wallpaper Summary Wallpaper Rolls: — Wall Input Mode— Total Wall Perimeter— Wall Height— Gross Wall Area— Openings Deducted— Net Wall Area— Wallpaper Type— Roll Dimensions— Usable Strip Length (per strip)— Pattern Type— Pattern Repeat— Pattern Matching Allowance— Total Strips Required— Strips per Roll— Rolls Required (net)— Waste Factor— Rolls to Order— Wall Liner / Primer— Adhesive Type— Paste Units Required— Wallpaper Cost— Wall Liner Cost— Paste Cost— Tools & Supplies— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Ordering wallpaper by square footage alone gets you short. The reason is pattern matching. A wall that’s 108 inches tall with an 18-inch straight-match pattern wastes 18 inches from every strip before you cut the first piece. A half-drop match wastes more. This wallpaper calculator works the way an installer does: it counts strips, not squares. Enter your wall height and perimeter, pick a roll preset, set the pattern type, and the tool returns total strips, strips per roll, and rolls to order with waste built in. Doors and windows get subtracted when you want them deducted. Paste coverage and liner area are calculated from the same inputs.   How to Use the Wallpaper Calculator Pick your unit system. Imperial uses inches, feet, and square feet. Metric uses millimeters, meters, and square meters. Choose a wall input mode. Perimeter walks the whole room. Single Wall covers one face. Direct Area works if you already know the square footage. Enter the wall dimensions. For perimeter mode, add room length, width, and height. Pick how many sides you’re papering. Subtract openings. Enter door and window counts with widths and heights. Toggle the deduct switch if you want them removed from net area. Choose a wallpaper type. Standard US roll, US double roll, Euro roll, metric roll, wide metric roll, or a custom size. Set the pattern match type. Random match wastes nothing. Straight match wastes one full repeat per strip. Offset match wastes 1.5 times the repeat. Enter the pattern repeat. Skip this if you picked random match. Set your waste factor. 10% covers most rooms. Bump to 15% for heavy cutting. Choose surface prep and paste. Wall liner, primer, or none. Then set paste coverage per roll. Add unit costs and read the summary. Rolls to order, paste units, liner area, and total cost all show in the result panel.   How the Wallpaper Calculator Formula Works Wallpaper math runs on strips, not squares. A strip is one vertical length of paper that runs from ceiling to floor. The number of strips depends on your wall perimeter and the roll width. The strips per roll depends on wall height and usable strip length. Formula: Total Strips = Ceiling(Wall Perimeter ÷ Roll Width) Formula: Pattern Allowance = Pattern Repeat × Match Factor Formula: Usable Strip Length = Roll Length − Pattern Allowance Formula: Strips per Roll = Floor(Usable Strip Length ÷ Wall Height) Formula: Rolls Required = Ceiling(Total Strips ÷ Strips per Roll) Formula: Rolls to Order = Ceiling(Rolls Required × (1 + Waste % ÷ 100)) Match factors come from the pattern type. Random match uses 0. Straight match uses 1 full repeat. Offset match uses 1.5 repeats. The offset figure accounts for cutting strips from alternating positions on the roll so the pattern lines up. Net area matters for paste and liner, not for roll count. Paste covers roughly five rolls per unit, so a 12-roll job needs three paste units. Liner covers the net wall area. Roll count always uses strips and perimeter, since cutting from a roll wastes the top and bottom of every strip. Openings matter too. If you deduct a door, the perimeter drops by the door width, which drops the strip count. Most installers deduct openings because papering around a door wastes material. The trade-off is more cutting and more waste. The tool lets you toggle it either way.   Worked Example A 14-foot

Work out how many wainscot panels, stiles, rails, and trim you need with our free calculator. Get sheet count, frame lumber, and a full cost estimate. Unit System Imperial (in / ft / ft²)Metric (mm / m / m²) Wall Details Wall Input Mode Single Wall (L × H)Room PerimeterDirect Area Entry Number of Identical Walls walls Wall Length ft Wall Height (floor to ceiling) ft Room Length ft Room Width ft Wall Height (floor to ceiling) ft Sides to Cover All 4 Walls3 Walls (One Open)2 Walls (Opposite)1 Wall Total Wall Length (for wainscot run) ft Wall Height (floor to ceiling) ft Openings to Deduct Number of Doors doors Door Width (each) ft Number of Windows in Wainscot Zone windows Window Width (each) ft Wainscoting Specification Wainscot Height (floor to chair rail top) in Panel Style Recessed Panel (Shaker)Raised PanelFlat Panel (Applied Moulding)BeadboardBoard & Batten Panel Count Mode Auto — Fit Standard WidthManual — Specify Count Number of Panels (per run) panels Target Panel Width in Stile Width (vertical members) in Top Rail Height in Bottom Rail Height in Trim & Moulding Baseboard Height in Chair Rail Height in Cap Moulding on Top of Chair Rail NoYes — Add Cap Moulding Cap Moulding Height in Cost Details Panel Sheet Cost (4×8 sheet) $ Frame Lumber per ft $ Chair Rail per ft $ Baseboard per ft $ Cap Moulding per ft $ Beadboard / Backing per ft² $ Adhesive & Fasteners (per area) $ Caulk & Filler (per area) $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Wainscoting Summary Panels Required: — Wall Input Mode— Total Wall Length— Total Openings Deducted— Effective Wainscot Length— Wainscot Height— Panel Style— Baseboard Height— Chair Rail Height— Cap Moulding— Panel Field Height— Panel Opening Height— Number of Panels— Panel Opening Width— Panel Opening Area (each)— Total Panel Opening Area— Stiles Required— Stile Length (total)— Rails Required— Rail Length (total)— Total Frame Lumber Length— Beadboard / Backing Area— Battens Required (B&B)— Panel Sheets Required— Chair Rail Length— Baseboard Length— Cap Moulding Length— Panel Material Cost— Frame Lumber Cost— Chair Rail Cost— Baseboard Cost— Cap Moulding Cost— Beadboard / Backing Cost— Adhesive & Fasteners— Caulk & Filler— Material Subtotal— Labor Cost— Additional Cost— Cost per ft² of Wainscot— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Introduction Wainscoting projects have a hidden cost: the layout math. A 20-foot wall with a door isn’t the same as 20 feet of panels. The stiles, rails, and panel openings all have to fit inside the effective run, and that run changes the moment you subtract a doorway. This wainscoting calculator handles that geometry for you. Feed it your wall length, wall height, and opening count. Then set your wainscot height, panel style, stile width, and rail heights. The tool returns a panel count that fits the space evenly, along with every stile, rail, and sheet you’ll need. Trim lengths for baseboard, chair rail, and cap moulding come out in the same run. Contractors use it for bids. Homeowners use it to sanity-check a materials list before ordering.   How to Use the Wainscoting Calculator Choose your unit system. Imperial uses inches, feet, and square feet. Metric uses millimeters, meters, and square meters. Pick a wall input mode. Single Wall covers one face. Room Perimeter walks the whole room. Direct Length skips geometry if you already know the total run. Enter the wall dimensions and any openings. Doors and windows reduce the effective wainscot length. Set the wainscot height. Thirty-six inches to the top of the chair rail is standard. Forty-two inches works in formal dining rooms. Pick a panel style. Shaker, raised, flat panel, beadboard, or board and batten. Frame-based styles need stile and rail dimensions. Choose panel count mode. Auto fits standard-width panels. Manual lets you set the count. Set trim heights. Baseboard, chair rail, and optional cap moulding. The tool subtracts these from wainscot height to find the panel field. Enter unit costs and read the summary. The result panel shows panel count, sheet count, frame lumber total, trim lengths, and total cost.   How the Wainscoting Calculator Formula Works The core calculation runs from the wall inward. Total wall length minus openings gives the effective wainscot length. Wainscot height minus baseboard and chair rail gives the panel field height. Every panel and frame piece sits inside those two numbers. Formula: Effective Length = Total Wall Length − (Doors × Door Width) − (Windows × Window Width) Formula: Panel Field Height = Wainscot Height − Baseboard Height − Chair Rail Height Formula: Panel Opening Height = Panel Field Height − Top Rail − Bottom Rail Formula: Number of Panels = Round((Effective Length − Stile Width) ÷ (Target Panel Width + Stile Width)) Formula: Panel Opening Width = (Effective Length − (Panels + 1) × Stile Width) ÷ Panels Formula: Stiles Required = Panels + 1 + Number of Openings Formula: Rails Required = 2 × Panels Each panel gets framed by stiles on both sides and rails at top and bottom. The tool adds one stile per opening, since each doorway or window interrupts the panel run and needs its own end stile. That’s where a lot of hand calculations go wrong. Skip those extra stiles and your frame lumber comes up short. Panel sheets are 4×8 feet (2.97 m²). The tool divides total panel opening area by sheet area and rounds up. Sheet count is a minimum, not a finished layout, so most installs use

Work out riser height, tread depth, stringer length, and total run with this free stair calculator. Checks IRC, IBC, and OSHA compliance plus costs. Unit System Imperial (in / ft)Metric (mm / m) Stair Geometry Total Rise (floor to floor) in Layout Method Auto — Fit Best RiserSpecify Number of Steps Number of Steps (risers) steps Tread Depth (going) in Stair Width in Nosing Overhang in Code Compliance Building Code Reference IRC — Residential (US)IBC — Commercial (US)OSHA — WorkplaceUK Building Regs (Part K)NCC — AustraliaCustom Limits Max Riser Height in Min Tread Depth in Min Stair Width in Max Riser / Tread Ratio ratio Headroom & Landings Available Headroom in Include Landing / Platform? NoYes — Add Landing Landing Length in Landing Width in Materials Stringer Count 2 Stringers (Standard ≤ 36″)3 Stringers (Wide Stairs)4 Stringers (Extra Wide / Heavy Load) Stringer Stock Length ft Tread Thickness in Riser Type Closed Riser (solid board)Open Riser (no board) Handrail Height in Baluster Spacing in Cost Details Stringer per ft $ Tread per ft $ Riser per ft $ Handrail per ft $ Baluster / Spindle Each $ Newel Post Each $ Landing Deck per ft² $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Stair Summary Stair Layout: — Total Rise— Number of Risers— Number of Treads— Actual Riser Height— Tread Depth (going)— Nosing Overhang— Total Run— Stringer Length (each)— Stair Angle— Stair Width— Riser / Tread Ratio— Landing Area— Riser Compliance— Tread Compliance— Width Compliance— Ratio Compliance— Headroom Compliance— Overall Compliance— Stringers Required— Stringer Material Length— Stringer Stock Pieces— Treads Required— Tread Material Length— Risers Required— Riser Material Length— Handrail Length (one side)— Total Handrail Length— Balusters Required— Newel Posts Required— Stringer Cost— Tread Cost— Riser Cost— Handrail Cost— Baluster Cost— Newel Post Cost— Landing Cost— Material Subtotal— Labor Cost— Additional Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Introduction Building a staircase without checking the numbers first is a recipe for sore knees and a failed inspection. This stair calculator takes the one measurement you can’t change, floor-to-floor rise, and works out everything else from there. Feed it your tread depth and stair width, and it returns the actual riser height, the number of steps, the total run, the stringer length, and the angle of the flight. It flags any dimension that fails your chosen building code and shows exactly which limit was crossed. For a typical 8-foot ceiling with a 10-inch tread, the tool lands you at 14 or 15 risers within a minute. Contractors use it for framing takeoffs. Homeowners use it to check a design before ordering lumber. Cost fields turn the geometry into a full materials estimate.   How to Use the Stair Calculator Pick your unit system. Imperial uses inches and feet. Metric uses millimeters and meters. Enter the total rise. Measure from finished floor to finished floor, not to the subfloor. Choose a layout method. Auto picks the number of risers for you. Manual lets you set the step count yourself. Set the tread depth and stair width. Ten inches of tread and 36 inches of width are common baselines. Choose a code standard. IRC, IBC, OSHA, UK, or NCC. The tool loads that code’s riser, tread, width, and ratio limits. Confirm the max riser, min tread, min width, and max ratio. Override them for a custom job. Add a landing if the stair turns. Enter the length and width in the same unit. Set stringer count, stock length, riser type, and baluster spacing. Then check the summary for compliance and material counts.   How the Stair Calculator Formula Works The math starts with rise and works backward to riser count. In auto mode, the tool targets an ideal riser height of about 7 inches (0.178 m) and rounds the total rise into whole risers. That means a 108-inch rise becomes 15 risers at 7.2 inches each, not 14 at 7.71. Formula: Number of Risers = Round(Total Rise ÷ Ideal Riser) Formula: Actual Riser Height = Total Rise ÷ Number of Risers Formula: Number of Treads = Number of Risers − 1 Formula: Total Run = Number of Treads × Tread Depth Formula: Stringer Length = √(Total Rise² + Total Run²) Formula: Stair Angle = atan2(Total Rise, Total Run) × 180 ÷ π The 17–18 rule (riser plus tread should land between 17 and 18 inches) is why auto mode aims for a 7-inch riser. On a 10-inch tread, that puts you at 17 inches exactly. The tool doesn’t enforce this rule directly, but it gives you the ratio output so you can check it. Compliance uses the code you pick. IRC caps the riser at 7.75 inches, sets the minimum tread at 10 inches, the minimum width at 36 inches, and the max riser-to-tread ratio at 1.0. IBC is stricter on commercial stairs. Headroom is checked against 80 inches (2032 mm) regardless of code. Stringer length is the diagonal across the whole flight. It’s the hypotenuse of rise and run. A carpenter cutting a stringer lays that number out on a 2×12 and traces the steps. Stock length matters: a 16-foot board covers a stringer up to 16 feet, and anything longer needs a second piece. Material counts come from the geometry. Stringer total length is one stringer length times the count (two for most residential stairs). Tread and riser lengths multiply step count by stair width. Handrail length equals stringer length on each side.   Worked Example A main staircase

Work out how many square yards of carpet your staircase needs. Free stair carpet calculator handles landings, hallway runs, pattern repeats, and cost. Unit System Imperial (in / ft / yd²)Metric (mm / m / m²) Stair Details Stair Configuration Preset Straight Flight — 13 StepsStraight Flight — 15 StepsStraight Flight — 16 StepsL-Shaped with Winder (split count)U-Shaped with Winder (split count)Custom Configuration Number of Steps (risers) steps Tread Depth (Going) in Riser Height in Stair Width in Nosing Allowance (per step) in Landings & Hallway Include Landing / Platform? NoYes — Add Landing Area Landing Length ft Landing Width ft Include Hallway? NoYes — Add Hallway Area Hallway Length ft Hallway Width ft Carpet Specification Carpet Roll Width 12 ft (3.66 m) — Standard15 ft (4.57 m) — WideCustom Width Actual Roll Width ft Pattern Type Plain / Solid — No RepeatSmall Pattern — Repeat ≤ 12″Medium Pattern — Repeat 12–24″Large Pattern — Repeat > 24″ Pattern Repeat in Waste / Cut Factor % Installation Materials Underlay Yes — Standard UnderlayYes — Premium / ThickNo — Carpet Only Gripper Rod YesNo Binding / Whipping NoYes — Exposed Edges Binding Length ft Cost Details Carpet per yd² $ Underlay per yd² $ Gripper Rod per ft $ Binding per ft $ Fitting / Labor Cost $ Additional Cost $ Summary Detailed Breakdown Stair Carpet Summary Carpet Required: — Number of Steps— Tread Depth— Riser Height— Nosing Allowance— Developed Length per Step— Stair Developed Length (total)— Stair Width— Stair Surface Area— Landing Area— Hallway Area— Total Installed Area— Total (sq yd)— Carpet Roll Width— Pattern Type— Pattern Repeat— Pattern Matching Allowance— Linear Length Required— Waste Factor— Carpet to Order (sq yd)— Carpet to Order (m²)— Underlay Required— Gripper Rod Required— Binding Length— Roll Width Check— Carpet Material Cost— Underlay Cost— Gripper Rod Cost— Binding Cost— Material Subtotal— Fitting / Labor Cost— Additional Cost— Cost per sq yd Installed— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Stair Carpet Calculator Carpet on stairs isn’t a simple area calculation. Each step has a tread you walk on, a riser behind it, and a nosing that wraps over the edge. Stack fourteen of those and you’ve got a developed length much longer than the horizontal run a tape measure gives you. This stair carpet calculator handles that math. Enter tread depth, riser height, and nosing allowance, and the tool builds a developed length, multiplies by stair width, then adds any landing or hallway you’re covering. It returns square yards to order, linear length along the roll, underlay and gripper rod quantities, and a cost estimate. Pattern repeats get their own matching allowance, and the tool checks whether your stair width fits inside a standard roll. Imperial and metric both work, and everything runs in your browser.   How to Use the Stair Carpet Calculator Choose your unit system. Imperial uses inches, feet, and square yards. Metric uses millimeters, meters, and square meters. Pick a stair configuration preset, or set the number of steps, tread depth, riser height, and stair width by hand. Set the nosing allowance. 1.5 inches is typical for a wrapped nosing. Bump it higher if your carpet is thick or you’re folding around a bullnose. Add a landing if the stairs turn. Enter the landing length and width. Add a hallway if you’re carpeting the run-up. Enter its length and width. Pick your carpet roll width. 12 feet is standard. 15 feet works for wide landings. Choose the pattern type and repeat. Plain adds no allowance. A patterned carpet adds one repeat per junction to keep the pattern lined up. Set the waste factor. 10% is standard for plain carpet. Toggle underlay, gripper rod, and binding. Enter binding length only if you’re wrapping exposed edges. Add unit costs and read the result. The output panel shows total carpet to order, linear feet along the roll, and total cost.   How the Stair Carpet Calculator Formula Works The core calculation is developed length. Each step contributes one tread depth, one riser height, and one nosing allowance. Multiply that per-step figure by the number of steps and you have the total length of carpet that runs up the staircase before any width is applied. Formula: Developed Length per Step = Tread Depth + Riser Height + Nosing Allowance Formula: Total Developed Length = Developed Length per Step × Number of Steps Formula: Stair Surface Area = Total Developed Length × Stair Width Formula: Total Installed Area = Stair Area + Landing Area + Hallway Area Formula: Linear Length Along Roll = (Total Installed Area ÷ Roll Width) + Pattern Allowance Formula: Carpet to Order = Linear Length Along Roll × Roll Width × (1 + Waste % ÷ 100) Formula: Square Yards to Order = Carpet to Order Area ÷ 9 A few details matter here. First, developed length uses tread plus riser, not just tread. A 14-step flight with an 11-inch tread and a 7.25-inch riser has a per-step figure of 18.25 inches before the nosing. That’s the number most hand calculations miss. Second, the linear length along the roll assumes the carpet runs up the stairs in one continuous strip. If your stair width exceeds the roll width, you’ll need a seam, and the tool flags it in the result panel. A 12-foot roll covers almost any residential stair, so the warning typically only fires on 15-foot rolls with very wide landings. Third, pattern repeats get added once per junction, not once per

Convert any shape into square yards with our free calculator. Get area, volume, weight, and cost estimates for carpet, concrete, topsoil, and more in one pass. Unit System Imperial (ft / yd)Metric (m / yd) Area Input Shape Rectangle / SquareL-Shape (Corner Cutout)CircleTriangleTrapezoidDirect Area Entry Number of Identical Areas areas Length ft Width ft Overall Length ft Overall Width ft Cutout Length ft Cutout Width ft Input Method RadiusDiameterCircumference Circle Dimension ft Base ft Height ft Parallel Side A ft Parallel Side B ft Height ft Total Area ft²yd²m²in²acres Material Specification Material / Use CarpetSod / TurfConcrete SlabTopsoilMulchGravel / AggregateSandPaver BaseCustom (area only) Depth / Thickness inftcmmm Waste / Cut Factor % Material Density (bulk only) lb/ft³ Cost Details Material Cost per yd² $ Bulk Material per ton $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Area Summary Square Yards: — Shape— Number of Areas— Area per Unit— Total Area (ft²)— Total Area (m²)— Total Area (in²)— Total Area (acres)— Total Area (square yards)— Waste Factor— Area with Waste— Square Yards with Waste— Material / Use— Depth / Thickness— Volume (ft³)— Volume (yd³)— Volume (m³)— Material Weight— Material Cost— Bulk Material Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Cost per yd²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Ordering carpet by the square yard gets expensive fast when your estimate is off. This square yard calculator converts any floor plan, garden bed, or slab into the units your supplier actually sells in. Pick a shape (rectangle, circle, triangle, trapezoid, L-shape, or a direct area number), enter the dimensions, and it returns area in yd², ft², m², in², and acres. Choose a material and the tool adds volume and weight, since concrete, topsoil, and gravel sell by the cubic yard or the ton, not the square yard. Waste factor defaults to 10%, which handles most cuts and offcuts. Contractors use it for takeoffs; homeowners use it to double-check quotes before signing.   How to Use the Square Yard Calculator Choose your unit system. Imperial uses feet and yards. Metric uses meters and still reports square yards for supplier matching. Pick a shape. Rectangle, L-shape, circle, triangle, trapezoid, or direct area entry if you already know the number. Enter the dimensions for your shape. Add how many identical areas you have if you’re doing multiple rooms or garden beds. Choose a material. Carpet, sod, concrete, topsoil, mulch, gravel, sand, paver base, or custom. Set the depth. Defaults load per material, so concrete starts at 4 inches and mulch at 3. Adjust the waste factor. 10% covers most cuts. Bump it to 15% for diagonal layouts. Optional: set the density. Only matters for bulk materials when you’re pricing by weight. Enter unit costs and read the summary. Material, labor, and additional cost lines add up to a total.   How the Square Yard Calculator Formula Works One square yard is 9 square feet. That’s the pivot point. The tool converts every input to square meters first, then converts again to display in yd², ft², m², in², and acres. This keeps the math consistent no matter which unit you start in. Formula: Square Yards = Square Feet ÷ 9 Formula: Rectangle Area = Length × Width Formula: L-Shape Area = (Overall L × Overall W) − (Cutout L × Cutout W) Formula: Circle Area = π × r² (r = radius, diameter ÷ 2, or circumference ÷ 2π) Formula: Triangle Area = 0.5 × Base × Height Formula: Trapezoid Area = 0.5 × (Side A + Side B) × Height Formula: Area with Waste = Total Area × (1 + Waste % ÷ 100) Formula: Volume = Area with Waste × Depth Formula: Weight = Volume × Density Depth converts to meters internally, then back out to feet and yards. If you enter 4 inches, that’s 0.1016 meters, or 0.333 feet, or 0.111 yards. Density is stored as kg/m³ internally and displayed as lb/ft³ in imperial mode. Cost math runs on square yards, not square feet, because most material suppliers quote that way. Carpet, for example, comes in 12-foot wide rolls priced per square yard. Concrete sells by the cubic yard. Bulk materials like gravel and topsoil sell by the ton or tonne. The calculator lets you use both cost lines at once, so a job with bulk material and a per-area install can be priced in one pass.   Worked Example A living room that’s 14 feet 6 inches by 11 feet 3 inches, plus a hallway that’s 9 by 4 feet. Both areas go through the calculator together. Carpet at $4.25 per square yard, 10% waste, $350 labor. Living room: 14.5 × 11.25 = 163.13 ft². Hallway: 9 × 4 = 36 ft². Total: 163.13 + 36 = 199.13 ft². Add as two identical areas of different sizes, or enter the sum directly in direct area mode. Square yards: 199.13 ÷ 9 = 22.13 yd². With 10% waste: 22.13 × 1.10 = 24.34 yd². Material cost: 24.34 × $4.25 = $103.44. Labor: $350. Total: $453.44. Cost per square foot: 453.44 ÷ 199.13 = $2.28. Interpretation: You need 25 square yards of carpet to be safe. Most carpet suppliers sell by the square yard and will round up to the next full yard. At 24.34, you’d order 25. That’s 225 square feet of material for 199 square feet of floor, which is normal for a wall-to-wall job. Frequently Asked Questions How do I calculate square yards? Divide total square

Work out how much siding you need with our free calculator. Get squares, piece counts, starter strip, J-channel, corner trim, and a full cost breakdown. Unit System Imperial (in / ft / ft²)Metric (mm / m / m²) Wall Details Wall Input Mode Single Wall (L × H)Building PerimeterGable End (Rectangle + Triangle)Direct Area Entry Number of Identical Walls walls Wall Length ft Wall Height (eave) ft Building Length ft Building Width ft Wall Height (eave) ft Sides to Sided All 4 Sides3 Sides (One Open)2 Sides (Opposite)1 Side Gable Wall Width ft Wall Height (eave) ft Peak Height Above Eave ft Number of Gable Ends gables Total Wall Area ft² Total Perimeter (for trim) ft Average Wall Height (for corners) ft Openings to Deduct Number of Doors doors Door Width ft Door Height ft Number of Windows windows Window Width ft Window Height ft Siding Specification Siding Type Preset Exposure / Reveal in Piece Length ft Waste / Cut Factor % Trim & Accessories Starter Strip YesNo Corner Trim Yes — Inside + OutsideOutside OnlyNo J-Channel Yes — Around openings & trimNo House Wrap Yes — Full coverage + 10%No Frieze / Top Trim NoYes Trim Piece Length ft Cost Details Siding Cost per Square (100 ft²) $ Starter Strip per ft $ Corner Trim per ft $ J-Channel per ft $ House Wrap per ft² $ Frieze Trim per ft $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Siding Summary Siding Required: — Wall Input Mode— Gross Wall Area— Openings Deducted— Net Wall Area— Net Wall Area (Squares)— Wall Perimeter (bottom run)— Siding Type— Exposure / Reveal— Piece Length— Waste Factor— Area with Waste— Squares with Waste— Siding Pieces Required— Total Siding Length— Starter Strip Length— Corner Trim Length— J-Channel Length— House Wrap Area— Frieze / Top Trim Length— Siding Material Cost— Starter Strip Cost— Corner Trim Cost— J-Channel Cost— House Wrap Cost— Frieze Trim Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Introduction Every siding job starts with one number: the net wall area you actually have to cover. Get that wrong and you’re either short on material mid-install or you’ve overpaid for boards that sit in the garage. This calculator handles the arithmetic in one pass. Feed it your building length, width, eave height, and opening sizes. It computes gross area, deducts doors and windows, converts to squares, applies your waste factor, and returns piece count plus every trim and accessory length you need. Gable ends get their own mode so you’re not guessing at triangle area. Cost fields stay separate from dimensions, so you can build a bid without re-entering wall sizes. Metric and imperial both work, and the whole thing runs in your browser.   How to Use the Siding Calculator Set your unit system. Imperial uses inches, feet, and square feet. Metric uses millimeters, meters, and square meters. Pick a wall input mode. Single Wall handles one face. Perimeter covers a whole building. Gable End adds a triangle on top of a rectangle. Direct Area Entry skips geometry if you already know the square footage. Enter the wall dimensions for your chosen mode. For gable, add the peak height above the eave. Subtract openings. Enter door count, width, and height. Do the same for windows. Choose a siding preset or enter custom exposure and piece length. The exposure field drives piece count, not nominal board width. Set your waste factor. Default is 10%. Toggle trim and accessories. Starter strip, corner trim, J-channel, house wrap, and frieze trim each have their own switch. Enter unit costs and read the summary. The result panel shows squares, pieces, linear feet, and total cost.   How the Siding Calculator Formula Works The tool works in four stages: gross area, net area, squares, then pieces. Gross area depends on your input mode. A single wall is length times height. A perimeter is building perimeter times eave height. A gable adds a triangle (half the width times peak height) on top of the rectangle. Direct entry skips all of that. Formula: Gross Area = Wall Length × Wall Height Formula: Gable Area = (Width × Eave Height) + (0.5 × Width × Peak Height) Formula: Net Area = Gross Area − (Doors × Door W × Door H) − (Windows × Window W × Window H) Formula: Area with Waste = Net Area × (1 + Waste % ÷ 100) Formula: Squares = Area ÷ 100 ft² (imperial) or ÷ 9.29 m² (metric) Formula: Pieces = Ceiling(Area with Waste ÷ (Exposure × Piece Length)) Squares are a roofer’s unit, but siding suppliers use them too. One square equals 100 square feet. A 10-square job means 1,000 square feet of coverage. Vinyl, fiber cement, and engineered wood all get priced per square at the supplier level. Piece count uses the exposed face of the board, not the nominal width. A 5-inch vinyl lap board has a 5-inch exposure in this tool’s default. Multiply exposure by piece length and you get the coverage per piece. For a 12-foot piece at 5-inch exposure, that’s 5 square feet per piece. Divide area with waste by that number and round up. Trim calculations are simpler. Starter strip runs along the bottom perimeter. Corner trim runs the full height at each corner. J-channel runs around every opening plus a rough allowance along vertical terminations. House wrap covers net area plus 10%. Frieze trim runs along

Work out how many shiplap boards you need with our free calculator. Get board count, furring strips, trim lengths, and a full cost estimate in seconds. Unit System Imperial (in / ft / ft²)Metric (mm / m / m²) Wall Details Wall Input Mode Single Wall (L × H)Perimeter (Room)Direct Area Entry Number of Identical Walls walls Wall Length ft Wall Height ft Room Length ft Room Width ft Wall Height ft Sides to Cover All 4 Walls3 Walls (One Open)2 Walls (Opposite)1 Wall Total Wall Area ft² Total Perimeter (for trim) ft Openings to Deduct Number of Doors doors Door Width ft Door Height ft Number of Windows windows Window Width ft Window Height ft Shiplap Board Specification Board Preset Board Width (nominal) in Reveal Width (exposed face) in Stock Board Length ft Orientation Horizontal (standard)Vertical Waste / Cut Factor % Furring Strips & Fasteners Furring Strips Yes — Install Furring StripsNo — Fix Directly to Studs Furring Spacing (o.c.) in Fastener Type Brad Nails / Finish NailsFinish ScrewsStaplesAdhesive Only Fasteners per Board pcs Fasteners per Box pcs Trim & Finish Baseboard Trim YesNo Crown / Top Trim NoYes Corner Trim Yes — Inside + Outside cornersNo — Butt joints Trim Piece Length ft Finish / Paint Yes — Paint / StainNo — Raw Finish Cost Details Shiplap Cost per ft $ Furring Strip per ft $ Cost per Fastener Box $ Baseboard per ft $ Crown per ft $ Corner Trim per ft $ Finish Cost per ft² $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Shiplap Summary Shiplap Required: — Wall Input Mode— Gross Wall Area— Openings Deducted— Net Wall Area— Wall Perimeter (trim)— Board Width (nominal)— Reveal Width (exposed)— Stock Board Length— Orientation— Rows / Columns— Boards per Row / Column— Total Boards (net)— Total Boards (with waste)— Total Board Length Required— Furring Strips— Furring Strip Length (total)— Fastener Type— Total Fasteners Required— Fastener Boxes Required— Baseboard Trim Length— Crown Trim Length— Corner Trim Length— Total Trim Length— Shiplap Material Cost— Furring Strip Cost— Fastener Cost— Baseboard Cost— Crown Cost— Corner Trim Cost— Finish / Paint Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Introduction Shiplap projects live and die on board count. Order too few and you’re making a second trip to the lumber yard mid-install. Order too many and you’ve tied up money in boards you’ll return. This calculator takes the wall dimensions you already have and returns the numbers you actually need: rows of boards, boards per row, total board count with waste, furring strip length, fastener boxes, trim lengths, and a full cost estimate. It handles three wall input modes so you can work from a single wall, a room perimeter, or a direct area entry. Contractors use it for bids; homeowners use it to sanity-check material lists. Everything runs in your browser. No signup, no data leaves your device.   How to Use the Shiplap Calculator Choose your unit system. Pick imperial (inches, feet, square feet) or metric (millimeters, meters, square meters). Every input follows that choice. Pick a wall input mode. Single Wall uses length and height. Perimeter uses room dimensions. Direct Area Entry takes a known square footage. Enter wall dimensions and openings. Add the wall sizes, then subtract doors and windows by count, width, and height. Set your board. Pick a preset (1×4 through 1×10, or nickel gap) or enter custom width, reveal, and stock length. Reveal drives board count, not nominal width. Choose orientation and waste. Horizontal runs boards parallel to the floor; vertical stacks them floor to ceiling. Waste defaults to 10%. Configure furring and fasteners. If you’re adding furring strips, set the on-center spacing. Then pick a fastener type and set fasteners per board and per box. Add trim and finish. Toggle baseboard, crown, corner trim, and paint or stain. Enter trim piece length so the tool can estimate piece count. Enter cost figures and read the summary. Add unit costs for materials and labor, then check the result panel for boards, lengths, boxes, and total cost.   How the Shiplap Calculator Formula Works Board count comes from two numbers: how many rows you need and how many boards fit in each row. Rows = ceiling of wall height divided by reveal width. Boards per row = ceiling of wall length divided by stock board length. Multiply those together and you have the net board count. Formula: Rows = Ceiling(Wall Height ÷ Reveal Width) Formula: Boards per Row = Ceiling(Wall Length ÷ Stock Board Length) Formula: Total Boards (net) = Rows × Boards per Row Formula: Total Boards (with waste) = Ceiling(Net Boards × (1 + Waste % ÷ 100)) Formula: Net Wall Area = Gross Wall Area − (Doors × Door Width × Door Height) − (Windows × Window Width × Window Height) For vertical orientation, the axes swap: columns across the wall width replace rows, and boards per column come from dividing height by stock length. Horizontal is the standard install for most rooms, but vertical works well on accent walls and short runs. Furring strip count depends on orientation. For horizontal boards, furring rows = ceiling of wall height divided by furring spacing, plus one extra strip. Multiply that by the wall length and any duplicate walls. Fastener count is straightforward: total boards with waste times fasteners per board, then rounded up to full boxes. The cost side multiplies each material length

Calculate wheelchair ramp slope, length, and cost with our free ADA ramp calculator. Check 1:12 compliance, estimate materials, and plan landings and handrails. Unit System Imperial (in / ft / ft²)Metric (mm / m / m²) Ramp Geometry Rise (total vertical height) in Run Input Method Enter Run LengthEnter Desired Slope Run (horizontal distance) ft Desired Slope Ratio (1:X)Percent (%)Degrees (°) Ramp Width in Compliance & Landings Max Rise per Run in Number of Ramp Runs runs Number of Landings landings Landing Depth in Rise per Run in Safety & Surface Decking / Surface Material ConcreteWood DeckingComposite DeckingAluminum / MetalSteel GratingPaver / Tiled Handrails Auto (per code)Both SidesOne SideNone Edge Protection (Curbs) Yes — 2″ min curb / railNo Edge Protection Post Spacing ft Cost Details Decking Cost per ft² $ Framing Cost per ft² $ Handrail Cost per ft $ Post & Footing per Post $ Edge Protection per ft $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Ramp Summary Ramp Slope: — Total Rise— Total Run— Slope (Ratio)— Slope (Percent)— Slope (Degrees)— Ramp Surface Length (per run)— Total Ramp Surface Length— Number of Ramp Runs— Number of Landings— Rise per Run— Ramp Width— Landing Depth— Ramp Deck Area— Landing Area— Total Deck Area— Total Footprint Length— ADA Slope Compliance— ADA Width Compliance— Overall ADA Compliance— Handrails Required?— Handrail Length (total)— Edge Protection Length— Number of Support Posts— Decking Material Cost— Framing Cost— Handrail Cost— Post & Footing Cost— Edge Protection Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft² of Deck— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Introduction A wheelchair ramp needs to hit the right slope before anything else. Get that number wrong and the ramp fails inspection, strains the person using it, or costs more than it should. This calculator takes your rise (the vertical height from ground to threshold) and either your available run or a target slope, then returns everything downstream: slope ratio, percent grade, ramp surface length, number of runs, landing count, deck area, handrail length, post count, and a full cost breakdown. Contractors use it to price jobs. Homeowners use it to check whether the space beside a door can fit a compliant ramp. It handles imperial and metric units, and all the math runs in your browser.   How to Use the Wheelchair Ramp Calculator Pick your unit system. Choose imperial (inches, feet, square feet) or metric (millimeters, meters, square meters). Every input and result follows that choice. Enter the total rise. Measure from the ground to the top of the threshold or landing surface. The default is 24 inches. Choose how to set the run. Pick “Enter Run Length” if you know your horizontal distance, or “Enter Desired Slope” if you’re targeting a specific gradient. Enter the run or slope value. If you chose run, type the horizontal distance. If you chose slope, enter the value and pick ratio, percent, or degrees. Set the ramp width. The ADA minimum is 36 inches. Wider ramps work better for two-way traffic. Adjust compliance settings. Set the max rise per run (30 inches by default), landing depth, handrail choice, edge protection, and post spacing. Enter cost figures. Add decking cost per square foot, framing cost, handrail cost per foot, post cost, curb cost, labor, and any additional expenses. Leave them at zero if you just want dimensions. Read the summary. The result panel shows slope in three formats, ADA pass/fail on slope and width, total deck area, and total cost.   How the Wheelchair Ramp Calculator Formula Works The core relationship is simple: slope equals rise divided by run. Everything else builds off that. When you enter a run length, the calculator computes slope percent as (rise / run) × 100, slope ratio as run / rise, and slope degrees as atan2(rise, run) × 180 / π. When you enter a desired slope instead, the tool works backward to find the run length. Formula: Slope percent = (Rise ÷ Run) × 100 Formula: Slope ratio = Run ÷ Rise Formula: Slope length = √(Rise² + Run²) Formula: Run = Rise ÷ (Slope percent ÷ 100) The ramp surface length (also called slope length) is the hypotenuse of the triangle formed by rise and run. You need that number for decking and railing material takeoffs, not just the horizontal run. Runs and landings depend on the max rise per run. The calculator divides total rise by that limit and rounds up. A 40-inch rise with a 30-inch max gives you two runs and three landings. Each run’s rise is the total rise divided by the run count.   Worked Example Let’s run through a 27-inch rise with a 20-foot run, 42-inch width, and a target 1:12 slope check. Inputs: Rise = 27 in, Run = 20 ft, Width = 42 in, Max rise per run = 30 in, Landing depth = 60 in. Step 1 – Slope calculation. Convert run to inches: 20 ft × 12 = 240 in. Slope percent = (27 ÷ 240) × 100 = 11.25%. Slope ratio = 240 ÷ 27 = 1:8.89. Slope degrees = atan2(27, 240) × 180/π = 6.42°. Step 2 – ADA check. The ADA maximum is 8.33%. At 11.25%, this ramp fails slope compliance. Width passes at 42 in. Overall: not compliant. Step 3 – Runs and landings. 27 ÷ 30 = 0.9, rounded up to 1 run. Landings = 1 + 1 = 2. Rise per run = 27 in. Step

Work out how many plywood sheets a project needs. Enter the area, sheet size, thickness, framing spacing and waste, then get sheets, fasteners and cost. Unit System Imperial (ft / ft² / in)Metric (m / m² / mm) Project Area Application Wall SheathingSubfloorUnderlaymentRoof DeckingCabinet / FurnitureShelving / StorageConcrete FormworkCustom Project Area Shape RectangleL-Shape (Corner Cutout)Direct Area Entry Number of Identical Areas areas Length ft Height / Width ft Overall Length ft Overall Width ft Cutout Length ft Cutout Width ft Total Area ft² Sheet Specification Sheet Size Preset Sheet Length ft Sheet Width ft Panel Thickness 1/4″ (6 mm) — Underlayment3/8″ (9 mm) — Light Sheathing1/2″ (12 mm) — General Purpose5/8″ (15 mm) — Subfloor / Roof3/4″ (18 mm) — Heavy Duty / Cabinet1″ (25 mm) — Structural Number of Layers 1 Layer2 Layers (double thickness) Waste / Cut Factor % Framing & Fasteners Framing Spacing in Fastener Type ScrewsNails (Ring-Shank / Common)StaplesAdhesive OnlyNone (Dry Fit) Fasteners per Sheet pcs Fasteners per Box pcs Cost Details Cost per Sheet $ Cost per Fastener Box $ Construction Adhesive per Sheet $ Edge Banding / Tape $ Finish / Sealer $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Plywood Summary Plywood Required: — Application— Area Shape— Number of Areas— Area per Unit— Total Area— Sheet Size— Sheet Area (each)— Panel Thickness— Number of Layers— Layered Coverage Area— Waste Factor— Area with Waste— Sheets Required (net)— Sheets Required (with waste)— Total Panel Thickness— Framing Spacing— Fastener Type— Total Fasteners Required— Fastener Boxes Required— Plywood Material Cost— Fastener Cost— Adhesive Cost— Edge Banding Cost— Finish / Sealer Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Plywood Calculator: Sheets, Fasteners and Total Cost This plywood calculator works out how many sheets a job needs. Enter the area, sheet size, thickness, layers, and waste. It returns sheet count, fasteners, and cost. Plywood estimating comes down to three numbers: sheets, fasteners, and waste. Get the sheet count right and the job moves. Get it wrong and you’re short a sheet with no matching grain. This plywood calculator handles the arithmetic for wall sheathing, subfloor, roof decking, cabinets, and concrete forms.   How to Use the Plywood Calculator Pick the unit system: imperial (ft, ft², in) or metric (m, m², mm). Choose an application: sheathing, subfloor, roof, cabinet, and more. Pick the area shape: rectangle, L-shape, or direct area. Enter the dimensions. For a rectangle, type length and height. Set the number of identical areas if you have more than one. Choose a sheet size preset or enter custom dimensions. Pick panel thickness, number of layers, and waste factor. Set framing spacing, fastener type, and fasteners per sheet.   How the Plywood Calculator Formula Works Sheet count comes from area divided by sheet area, with layers and waste applied. Fasteners come from sheet count and the pattern you choose. Formula: Project area = Length × Width × AreasFormula: Sheet area = Sheet length × Sheet widthFormula: Layered area = Project area × Number of layersFormula: Area with waste = Layered area × (1 + Waste %)Formula: Sheets needed = [ Area with waste ÷ Sheet area ]Formula: Total fasteners = Fasteners per sheet × Sheets × LayersFormula: Fastener boxes = [ Total fasteners ÷ Fasteners per box ] The tool separates the net sheet count from the sheet count with waste. Net is the bare area divided by sheet area. With waste is the number you order. Waste covers cuts at edges, around openings, and mistakes. Ten percent is the default for most projects. Fastener counts scale with sheet count and layers. A single-layer wall gets one set of fasteners per sheet. A double-layer floor gets two. The tool adjusts the default fastener count based on framing spacing and application.   Worked Example: A 20 ft × 8 ft Wall Sheathing Job Say you’re sheathing a 20 ft by 8 ft wall. One area, one layer. Sheets are 4 ft × 8 ft, 1/2 inch thick. Framing is 16 inches on centre. Fastener type is screws, 32 per sheet, 100 per box. Waste is 10%. Sheets cost $35 each, screws $8 per box, labor $200. Area: 20 × 8 = 160 ft² Sheet area: 4 × 8 = 32 ft² Layered area: 160 × 1 = 160 ft² With 10% waste: 160 × 1.10 = 176 ft² Sheets net: ⌈160 ÷ 32⌉ = 5 Sheets with waste: ⌈176 ÷ 32⌉ = 6 Total fasteners: 32 × 6 × 1 = 192 Fastener boxes: ⌈192 ÷ 100⌉ = 2 Plywood cost: 6 × $35 = $210 Fastener cost: 2 × $8 = $16 Material subtotal: $226 Labor: $200 Total: $426 Cost per ft²: $2.66 Six sheets cover the wall with waste. Two boxes of screws cover the fastening. The material cost is $226 before labor. Frequently Asked Questions How many sheets of plywood do I need? Divide the area by the sheet area, then add waste. A 160 ft² wall with 4 ft × 8 ft sheets needs 5 sheets net and 6 with 10% waste.   What thickness plywood for a subfloor? Five-eighths inch is standard for subfloor. Three-quarter inch is used for heavy duty or when the joist spacing is wider than 16 inches. Check local code.   How many screws per sheet of plywood? About 32 screws for a 4 ft × 8 ft sheet on 16-inch centres. Closer framing needs more. Roof decking uses slightly

Work out how much bedding sand and joint sand a paver patio needs. Enter the area, sand depth, and joint width, then get volume, weight, bags and cost. Unit System Imperial (ft / ft² / lb)Metric (m / m² / kg) Area Details Area Shape RectangleL-Shape (Corner Cutout)Direct Area Entry Number of Identical Areas areas Area Length ft Area Width ft Overall Length ft Overall Width ft Cutout Length ft Cutout Width ft Total Area (all areas) ft² Total Perimeter ft Sand Specification Sand Application Bedding Sand (under pavers)Leveling Sand (thicker layer)Bedding + Joint SandJoint Sand Only Sand Bedding Depth in Compaction Factor % Waste / Loss Factor % Sand Density lb/ft³ Joint Sand Joint Sand Type Polymeric Sand (stabilised)Fine / Masonry SandCoarse SandStone Dust / Fines Joint Width in Paver Length in Paver Width in Joint Depth (fill depth) in Coverage per Bag / Roll ft² Cost Details Bedding Sand per ton $ Bulk Sand Bag Cost (25 kg / 50 lb) $ Joint Sand per Bag / Roll $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Sand Summary Sand Required: — Area Shape— Number of Areas— Area per Unit— Total Area— Total Perimeter— Sand Application— Sand Bedding Depth— Compaction Factor— Waste Factor— Sand Density— Bedding Sand Volume (loose)— Bedding Sand Weight— Bulk Bags (25 kg / 50 lb)— Joint Sand Type— Joint Width— Joint Depth— Joint Sand Volume (net)— Joint Sand Weight— Joint Sand Bags Required— Bedding Sand Cost— Joint Sand Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Paver Sand Calculator: Bedding, Joint Sand and Cost This paver sand calculator works out how much bedding sand goes under the pavers and how much joint sand goes between them. Enter the area, sand depth, and joint width, and it returns volume, weight, bulk bags, and total cost. Sand is the quiet cost of a paver job. The pavers get all the attention, but the sand underneath and between them decides whether the patio stays level and whether the joints hold. This paver sand calculator covers both. It takes the area you’re paving, the sand depth, the compaction factor, and the joint width, then works out bedding sand, joint sand, and the bags or bulk weight you need to order. It handles rectangles, L-shapes, and direct area entry.   How to Use the Paver Sand Calculator Pick the unit system: imperial (ft, ft², lb) or metric (m, m², kg). Choose the area shape: rectangle, L-shape, or direct area. Enter the dimensions. For a rectangle, type length and width. Set the number of identical areas if you have more than one. Pick the sand application: bedding, leveling, both bedding and joint, or joint only. Enter the bedding sand depth, compaction factor, and waste factor. For joint sand, set the joint width, paver size, joint depth, and coverage per bag. Add your prices for bedding sand, joint sand, and labor. The Summary tab leads with total sand weight and bag counts. Detailed Breakdown lists every volume and weight behind the result.   How the Paver Sand Calculator Formula Works The calculator separates bedding sand from joint sand. Each has its own volume calculation. Formula: Area = Length × Width (rectangle) or (Overall area − Cutout area) for L-shapeFormula: Bedding volume (compacted) = Area × Sand depthFormula: Bedding volume (loose) = Compacted volume × (1 + Compaction %) × (1 + Waste %)Formula: Bedding weight = Loose volume × Sand densityFormula: Bulk bags = ⌈ Bedding weight ÷ Bag weight ⌉Formula: Joint area fraction = 1 − (Paver L × Paver W) ÷ ((Paver L + Joint W) × (Paver W + Joint W))Formula: Joint volume = Area × Joint area fraction × Joint type factor × Joint depthFormula: Joint bags = ⌈ Area ÷ Coverage per bag ⌉ Bedding volume starts compacted, then loosens up. Base material and sand both compact, so you order more loose volume than the finished depth suggests. A 20% compaction factor means 20% more volume in the bag than in the ground. Joint sand volume depends on the gap between pavers. The joint area fraction compares the paver’s face area to the module area (paver plus joint). The difference is the joint. Polymeric sand uses slightly less volume because it binds, so the tool applies a 0.95 factor. Coarse sand uses slightly more. Density converts volume to weight. The default is 100 lb/ft³ (1,600 kg/m³), which matches most dry masonry sand. If your supplier publishes a different density, change it.   Worked Example: A 20 ft × 15 ft Patio Say you’re laying a 20 ft by 15 ft patio. Bedding sand is 1 inch deep, compaction factor is 20%, waste is 10%. Sand density is 100 lb/ft³. Joint width is 0.125 in, paver is 8×4 in, joint depth is 1 in, coverage is 100 ft² per bag. Bulk bags are 50 lb. Costs: $5 per bulk bag, $25 per joint bag, $200 labor. Area: 20 × 15 = 300 ft² Sand depth: 1 in = 0.0833 ft Bedding volume compacted: 300 × 0.0833 = 25.0 ft³ Bedding volume loose: 25 × 1.20 × 1.10 = 33.0 ft³ Bedding weight: 33 × 100 = 3,300 lb Bulk bags: ⌈3,300 ÷ 50⌉ = 66 bags Paver area: 8 × 4 = 32 in² Module area: (8 + 0.125) × (4 + 0.125) = 8.125 × 4.125 = 33.52 in² Joint area fraction: 1 − (32 ÷ 33.52)

Work out how many pavers a patio or driveway needs. Enter the area, pick a paver size and pattern, then get pavers, base, sand, edge and estimated total cost. Unit System Imperial (ft / ft² / ton)Metric (m / m² / tonne) Area Details Area Shape RectangleL-Shape (Corner Cutout)Direct Area Entry Number of Identical Areas areas Area Length ft Area Width ft Overall Length ft Overall Width ft Cutout Length ft Cutout Width ft Total Area (all areas) ft² Total Perimeter ft Paver Selection Paver Size Preset Paver Length in Paver Width in Laying Pattern Running Bond / StretcherHerringbone 45°Herringbone 90°BasketweaveStack BondRandom / Ashlar Pattern Waste Factor % Pavers per Bundle / Pallet (0 = unit pricing) pcs Base, Bedding & Edge Application Type Patio / Walkway (light duty)Driveway (standard duty)Driveway (heavy duty) Compacted Base Depth in Base Compaction Factor % Sand Bedding Depth in Joint Sand Coverage per Bag ft² Edge Restraint Length Auto (= perimeter)Manual Override Edge Length (manual) ft Cost Details Cost per Paver $ Base Material per ton $ Sand per ton $ Joint Sand per Bag $ Edge Restraint per ft $ Labor Cost per ft² $ Additional Cost $ Summary Detailed Breakdown Paver Summary Pavers Required: — Area Shape— Number of Areas— Area per Unit— Total Area— Total Perimeter— Paver Size— Paver Area (each)— Laying Pattern— Pavers Required (net)— Pavers Required (with waste)— Bundles / Pallets— Application Type— Base Depth (compacted)— Base Volume (loose)— Base Weight— Sand Bedding Volume— Sand Weight— Joint Sand Bags— Edge Restraint Length— Paver Material Cost— Base Material Cost— Sand Cost— Joint Sand Cost— Edge Restraint Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Paver Calculator: Estimate Pavers, Base, Sand and Cost This paver calculator works out how many pavers a patio or driveway needs. Enter the area, pick a paver size and laying pattern, and it returns pavers, base material, bedding sand, joint sand, edge restraint, and total cost. Works in metric or imperial units. Laying a patio or driveway starts with a simple question: how many pavers do I need? Get it wrong and you’re either short mid-job or stuck with a pallet of leftovers. This paver calculator answers that question and the ones that follow it. It takes the area you’re covering, the paver size, and the laying pattern, then works out the paver count, the base material, the bedding sand, the joint sand, and the edge restraint. It also handles costs, so you can budget the whole project. The tool runs in your browser, which means your measurements and prices stay private. Use it for a small walkway or a full driveway. It works in both metric and imperial units, and it’s free to use as many times as you need. Whether you’re a contractor pricing a job or a homeowner planning a weekend project, the numbers you need are here.   How to Use the Paver Calculator Pick the unit system: imperial or metric. Choose the area shape: rectangle, L-shape, or direct area. Enter the dimensions. For a rectangle, type length and width. Set the number of identical areas if you have more than one. Pick a paver size preset or enter custom dimensions. Choose a laying pattern. The waste factor updates automatically. Enter the base depth, sand depth, and joint sand coverage. Add your prices for pavers, base, sand, joint sand, edge, and labor.   How the Paver Calculator Formula Works Start with the area. A rectangle is length times width. An L-shape subtracts the cutout. Direct area is whatever you type. Then divide by the area of one paver to get the paver count. Formula: Pavers = [ (Area × (1 + Waste %)) ÷ Paver Area ]Formula: Base volume (loose) = Area × Base depth × (1 + Compaction %)Formula: Base weight = Base volume × 1600 kg/m³Formula: Sand volume = Area × Sand depthFormula: Sand weight = Sand volume × 1600 kg/m³Formula: Joint sand bags = [ Area ÷ Coverage per bag ]Formula: Edge length = Perimeter (or manual)Formula: Total cost = Pavers + Base + Sand + Joint sand + Edge + Labor + Additional The compaction factor accounts for the difference between loose and compacted base. A 25% factor means you need 25% more volume in loose material to end up with the compacted depth. That’s why you order more than the finished volume suggests. Pattern waste runs from 5% for running bond up to 12% for herringbone 45°. The tool adds that to your base waste factor.   Worked Example: A 20 ft × 15 ft Patio Say you’re paving a 20 ft by 15 ft patio. You choose 4″ × 8″ brick pavers, running bond pattern, 5% waste. Base depth is 4 inches compacted, with a 25% compaction factor. Bedding sand is 1 inch. Joint sand covers 100 ft² per bag. Edge restraint is auto. Prices: $0.85 per paver, $40 per ton of base, $35 per ton of sand, $18 per bag of joint sand, $3 per foot of edge, $4 per ft² labor. Area: 20 × 15 = 300 ft² Paver area: (4/12) × (8/12) = 0.333 × 0.667 = 0.222 ft² Waste: 5% (running bond) Pavers net: ⌈300 ÷ 0.222⌉ = 1,351 With 5% waste: ⌈300 × 1.05 ÷ 0.222⌉ = 1,419 Base depth (compacted): 4 in = 0.333 ft Base volume (compacted): 300 × 0.333 = 100 ft³ Compaction factor: 25% → loose volume = 100

Work out how much paint a room needs. Enter dimensions, deduct openings, and get gallons or litres for walls, ceiling and trim plus a cost estimate. Unit System Imperial (ft / ft² / gal)Metric (m / m² / L) Room Dimensions Number of Identical Rooms rooms Room Length ft Room Width ft Wall Height ft Surfaces to Paint Paint Walls? YesNo Paint Ceiling? NoYes Paint Trim / Baseboard? YesNo Trim Height (baseboard) ft Openings to Deduct Number of Doors doors Door Width ft Door Height ft Number of Windows windows Window Width ft Window Height ft Paint Specification Paint Type Interior Latex / AcrylicExterior AcrylicPrimer / SealerOil-Based EnamelSpecialty / Elastomeric Number of Coats 1 Coat2 Coats3 Coats Coverage per Gallon ft² Waste / Loss Factor % Cost Details Cost per Gallon (Walls/Ceiling) $ Cost per Quart (Trim) $ Painter’s Tape & Supplies $ Brushes, Rollers & Trays $ Labor Cost $ Additional Cost $ Summary Detailed Breakdown Paint Summary Paint Required: — Number of Rooms— Wall Area (per room, net)— Ceiling Area (per room)— Trim Area (per room)— Total Paintable Area (net)— Total Area with Coats— Total Area with Waste— Coverage per Gallon— Paint Type— Number of Coats— Gallons Required (Walls & Ceiling)— Quarts Required (Trim)— Paint Cost (Walls & Ceiling)— Paint Cost (Trim)— Supplies Cost— Tools Cost— Material Subtotal— Labor Cost— Additional Cost— Cost per ft²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Paint Calculator: Estimate Walls, Ceiling, Trim and Cost This paint calculator figures out how much paint a room needs. It handles walls, ceiling, and trim separately, subtracts doors and windows, and adds a waste factor. You’ll get gallons or litres for the main surfaces and quarts or small cans for trim, plus a full cost breakdown. A gallon of paint covers about 350 square feet. That’s the number on the label. But the real amount you need depends on how many coats, how much waste, and whether you’re painting the ceiling or just the walls. This tool pulls all those variables together. Enter room dimensions, dedut openings, pick a paint type, and set the coverage. It returns the containers to buy and what they’ll cost.   How to Use the Paint Calculator Pick the unit system: imperial (ft, ft², gal) or metric (m, m², L). Enter the number of identical rooms. Type the room length, width, and wall height. Choose which surfaces to paint: walls, ceiling, trim. If painting trim, set the baseboard height. 0.33 ft (4 inches) is typical. Enter the number of doors and windows, plus their dimensions. Pick a paint type and number of coats. Two coats is standard. Adjust coverage per gallon and waste factor, then add costs. The Summary tab shows total paint needed and the cost. Detailed Breakdown lists every area and calculation.   How the Paint Calculator Formula Works The tool works in three stages: net area, area with coats and waste, then containers and cost. Formula: Perimeter = 2 × (Length + Width)Formula: Gross wall area = Perimeter × Wall heightFormula: Net wall area = Gross wall area − Door area − Window areaFormula: Ceiling area = Length × WidthFormula: Trim area = Perimeter × Trim heightFormula: Total net area = (Net wall + Ceiling + Trim) × RoomsFormula: Area with coats = Total net area × CoatsFormula: Area with waste = Area with coats × (1 + Waste %)Formula: Main containers = [ (Wall + Ceiling area with waste) ÷ Coverage per gallon ]Formula: Trim containers = [ (Trim area with waste) ÷ (Coverage per gallon ÷ 4) ] Trim uses quart cans, so its coverage is one quarter of a gallon. That’s why the tool divides coverage by four when calculating trim containers. If you’re working in metric, the same logic applies with litres and small cans. Deductions are per room. If you have three identical rooms, the tool subtracts doors and windows from each room’s wall area, then multiplies by three. Waste and coats are applied after all areas are summed. Costs are straightforward. Main paint cost is containers times price per gallon. Trim cost is trim containers times price per quart. Supplies, tools, labor, and additional costs are added on top. Cost per square foot is total cost divided by total net area.   Worked Example: A 12 ft × 10 ft Bedroom Say you’re painting a 12 ft by 10 ft bedroom with 8 ft walls. One room. You’re painting walls and trim, not the ceiling. Two doors (3 ft × 7 ft) and two windows (3 ft × 4 ft). Two coats. Coverage is 350 ft² per gallon. Waste is 10%. Paint costs $30 per gallon, trim paint $12 per quart. Perimeter: 2 × (12 + 10) = 44 ft Gross wall area: 44 × 8 = 352 ft² Door area: 2 × 3 × 7 = 42 ft² Window area: 2 × 3 × 4 = 24 ft² Net wall area: 352 − 42 − 24 = 286 ft² Trim area: 44 × 0.33 = 14.5 ft² Total net area: 286 + 14.5 = 300.5 ft² Area with two coats: 300.5 × 2 = 601 ft² With 10% waste: 601 × 1.10 = 661.1 ft² Main area (walls only): 286 × 2 × 1.10 = 629.2 ft² Main containers: ⌈629.2 ÷ 350⌉ = 2 gallons Trim area with waste: 14.5 × 2 × 1.10 = 31.9 ft² Trim coverage: 350 ÷ 4 = 87.5 ft² per quart Trim containers: ⌈31.9 ÷ 87.5⌉

Work out the safest ladder angle for any job. Enter working height and base distance to get the angle, base distance, reach height and duty rating. Unit System Imperial (ft)Metric (m) Ladder Details Ladder Type Extension LadderStraight / Single LadderCombination LadderArticulated / Multi-PositionPlatform Ladder (Self-Supporting)Step Ladder (A-Frame, Self-Supporting) Total Ladder Length ft Duty Rating Type III — 200 lb (Light Duty)Type II — 225 lb (Medium Duty)Type I — 250 lb (Heavy Duty)Type IA — 300 lb (Extra Heavy Duty)Type IAA — 375 lb (Special Duty) Setup Geometry Working Height (to support point) ft Base Distance (wall to foot) ft Standout Above Roof (0 if none) ft User Overhead Reach ft Cost Details Ladder Cost $ Safety Accessories $ Labor / Installation $ Additional Cost $ Summary Detailed Breakdown Ladder Angle Summary Ladder Angle: — Ladder Type— Duty Rating— Load Capacity— Total Ladder Length— Working Height— Base Distance (actual)— Ladder Angle— Ideal Angle (4:1 rule)— Recommended Base Distance— Base Distance Deviation— Angle Deviation from Ideal— Contact Length (ladder to support)— Standout Above Contact (actual)— Standout Required— Required Total Ladder Length— Length Surplus / Deficit— Max Safe Standing Height— Max Reach Height— Ladder Cost— Safety Accessories— Labor / Installation— Additional Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Ladder Angle Calculator: Safe Setup, Angle and Reach Height A ladder that’s set too steep can tip backward. One that’s set too shallow can slip out at the base. Both failures happen in under a second, and both are avoidable. This ladder angle calculator works out the angle from your working height and base distance, checks it against the 4:1 rule, and returns the recommended base distance, contact length, standout above the roof, and maximum safe reach height. Six ladder types are covered: extension, straight, combination, articulated, platform, and step. Duty ratings run from Type III at 200 lb up to Type IAA at 375 lb. The tool flags unsafe angles, confirms whether the ladder is long enough, and shows whether the standout above the contact point meets the 3-foot OSHA minimum. Metric and imperial units switch cleanly, and everything runs in the browser.   How to Use the Ladder Angle Calculator Pick the unit system: imperial (ft) or metric (m). Choose a ladder type. Extension is the default for roof access. Enter the total ladder length as marked on the side rail. Pick the duty rating that matches your ladder’s label. Type the working height, measured vertically to the support point. Enter the base distance, the horizontal distance from the wall to the foot. Add the standout above the roof and your overhead reach. Enter your ladder, accessories, labor and additional costs if you want a total. The Summary tab leads with the ladder angle and a pass or fail against the 4:1 rule. Detailed Breakdown lists every dimension and safety check.   How the Ladder Angle Calculator Formula Works The calculation is trigonometry. Working height is the vertical side of a right triangle, base distance is the horizontal side, and the ladder is the hypotenuse. Formula: Contact length = √(Height² + Base²)Formula: Ladder angle = atan2(Height, Base) × 180 ÷ πFormula: Recommended base = Working height ÷ 4Formula: Ideal angle (OSHA) = 75.5°Formula: Required ladder length = Contact length + StandoutFormula: Max standing height = (Ladder length − 3 ft clearance) × sin(angle)Formula: Max reach height = Max standing height + Overhead reach The 4:1 rule says the base should sit one quarter of the working height away from the wall. A 20 ft working height needs a 5 ft base distance, which produces an angle of about 76°, right at the OSHA ideal of 75.5°. That’s the ratio the calculator checks against when it flags safe or unsafe setups. The 70° to 80° window is the safe range. Below 70° and the ladder is too shallow, which stresses the feet and can slip. Above 80° and the ladder is too steep, which puts the center of gravity over the base and can tip backward. Both are flagged as unsafe. Standout is how much ladder extends above the contact point. OSHA requires at least 3 feet for extension ladders, so you have something to hold onto when stepping off at the top. The calculator checks this against your actual ladder length. Max standing height uses a 3-foot clearance from the top. The top rungs aren’t meant for standing. The tool subtracts that clearance, then projects the remaining ladder length up the angle to find the highest safe standing point. Adding your reach gives the top of your working envelope. Platform and step ladders are self-supporting, so the 4:1 rule doesn’t apply. The tool still calculates cost and duty rating but skips the angle assessment.   Worked Example: A 24 ft Extension Ladder at 20 ft Working Height Say you’re setting a 24 ft extension ladder to reach a 20 ft working height. Base distance is 5 ft. Standout is 3 ft. Overhead reach is 6.5 ft. Duty rating is Type IA (300 lb). Contact length: √(20² + 5²) = √425 = 20.62 ft Ladder angle: atan2(20, 5) = 75.96° Recommended base (4:1): 20 ÷ 4 = 5.00 ft Base deviation: 5 − 5 = 0.00 ft Angle deviation from ideal: 75.96° − 75.5° = +0.46° Required ladder length: 20.62 + 3 = 23.62 ft Length surplus: 24 − 23.62 = +0.38 ft Actual standout: 24 − 20.62 = 3.38 ft Standout requirement met: yes (3.38 ft ≥ 3 ft) Max standing height:

Work out hoops, frame pipe, greenhouse film and cost for a high tunnel. Enter the size, spacing and roll coverage to get rolls, pipe length and total cost.

Work out heat loss in BTU and kW for any room or home. Enter design temperatures, insulation R-values, and infiltration to get furnace size and annual heating cost. Unit System Imperial (ft² / °F / BTU)Metric (m² / °C / W) Design Conditions Indoor Design Temperature °F Outdoor Design Temperature °F Temperature Difference °F Safety Margin % Envelope Components (Conduction) Walls — Net Area ft² Walls — R-Value h·ft²·°F/BTU Ceiling / Roof — Area ft² Ceiling / Roof — R-Value h·ft²·°F/BTU Windows — Area ft² Windows — R-Value h·ft²·°F/BTU Doors — Area ft² Doors — R-Value h·ft²·°F/BTU Floor (over unconditioned) — Area ft² Floor — R-Value h·ft²·°F/BTU Slab Perimeter (set 0 if not applicable) ft Slab Edge F-Factor BTU/h·ft·°F Infiltration & Ventilation Method Air Changes per Hour (ACH)Airflow Rate (CFM / m³/h)None / Sealed Construction Air Changes per Hour ACH Conditioned Volume ft³ Airflow Rate CFM Cost Details Fuel Type Natural GasPropaneFuel OilElectric ResistanceHeat Pump (COP 3) Fuel Cost per Million BTU $ Full-Load Hours per Year hours Equipment Cost per 1,000 BTU/h $ Installation Labor $ Additional Cost $ Summary Detailed Breakdown Heat Loss Summary Total Heat Loss: — Indoor Design Temperature— Outdoor Design Temperature— Temperature Difference— Conduction Heat Loss— — Walls— — Ceiling / Roof— — Windows— — Doors— — Floor— — Slab Perimeter— Infiltration Heat Loss— Total Heat Loss— Total Heat Loss (kW)— Safety Margin— Design Heating Load— Recommended Furnace Size— Estimated Annual Heating Cost— Equipment Cost— Installation Labor— Additional Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Heat Loss Calculator: BTU, kW and Furnace Size Calculate heat loss through walls, ceiling, windows, doors, and floor using design temperatures and R-values. Infiltration adds to the total. The tool returns BTU, kW, recommended furnace size, and annual heating cost in imperial or metric units. Heat loss is the rate at which a building loses heat to the outside. It’s measured in BTU per hour or watts, and it depends on the temperature difference, the area and R-value of every surface, and how much air leaks through gaps. This heat loss calculator takes those inputs and returns the total load, plus a recommended furnace size and annual heating cost. Contractors use it to size equipment. Homeowners use it to check whether a quote makes sense. Enter design temperatures, wall and ceiling areas, R-values, window and door details, and infiltration.   How to Use the Heat Loss Calculator Pick the unit system: imperial (ft², °F, BTU) or metric (m², °C, W). Enter the indoor and outdoor design temperatures. The tool calculates the difference. Set a safety margin. Twenty percent is a common default. Type the net area and R-value for walls, ceiling, windows, doors, and floor. For slab-on-grade, add the perimeter and F-factor. Set both to zero if not applicable. Choose an infiltration method: air changes per hour (ACH), airflow rate (CFM), or none. Enter the conditioned volume if using ACH, or the airflow rate if using CFM. Pick a fuel type and cost, then add equipment, labor, and additional cost. The Summary tab leads with total heat loss and recommended furnace size. Detailed Breakdown lists every component’s heat loss and U-value.   How the Heat Loss Calculator Formula Works The calculator adds conduction losses through every envelope component to the infiltration loss. Conduction uses U-value, area, and temperature difference. Infiltration uses airflow and temperature difference. Formula: Temperature difference (ΔT) = Indoor temp − Outdoor tempFormula: U-value = 1 ÷ R-valueFormula: Conduction loss = U × Area × ΔTFormula: Slab loss = Perimeter × F-factor × ΔTFormula: Infiltration loss = 1.08 × CFM × ΔTFormula: Total heat loss = Conduction + InfiltrationFormula: Design load = Total heat loss × (1 + Safety margin ÷ 100)Formula: Recommended furnace size = Smallest standard size ≥ Design load The tool converts R-values and F-factors if you work in metric. An R-value of 13 h·ft²·°F/BTU becomes about 2.29 m²·K/W. The 1.08 multiplier in the infiltration formula converts CFM and ΔT to BTU/h for standard air. Standard furnace sizes run from 40,000 to 250,000 BTU/h. The tool picks the smallest one that meets the design load. It also estimates annual heating cost from the total heat loss, full-load hours, and fuel cost per million BTU.   Worked Example: A 2,000 ft² Home in a Cold Climate Say you’re calculating heat loss for a 2,000 ft² home. Indoor design temperature is 70°F. Outdoor design temperature is 10°F. Safety margin is 20%. The envelope has 1,200 ft² of walls at R-13, 1,500 ft² of ceiling at R-30, 200 ft² of windows at R-2, 60 ft² of doors at R-3, and 1,500 ft² of floor at R-19. Slab perimeter is 180 ft with an F-factor of 0.6. Infiltration is 0.5 ACH with a volume of 16,000 ft³. Natural gas costs $12 per million BTU. Full-load hours are 1,800. ΔT: 70 − 10 = 60°F Walls: U = 1/13 = 0.0769. Q = 0.0769 × 1,200 × 60 = 5,538 BTU/h Ceiling: U = 1/30 = 0.0333. Q = 0.0333 × 1,500 × 60 = 3,000 BTU/h Windows: U = 1/2 = 0.5. Q = 0.5 × 200 × 60 = 6,000 BTU/h Doors: U = 1/3 = 0.333. Q = 0.333 × 60 × 60 = 1,200 BTU/h Floor: U = 1/19 = 0.0526. Q = 0.0526 × 1,500 × 60 = 4,737 BTU/h Slab: Q = 180 × 0.6 × 60 = 6,480 BTU/h Conduction total: 5,538 + 3,000 + 6,000 + 1,200 + 4,737 + 6,480 =

Work out the right furnace size for your home. Enter floor area, climate, insulation and fuel type to get BTU, efficiency and annual cost. Unit System Imperial (ft² / °F)Metric (m² / °C) Home Details Conditioned Floor Area ft² Ceiling Height ft Number of Exterior Doors doors Window Area ft² Climate & Insulation Climate Zone Warm (South / Southwest) — 30–35 BTU/ft²Moderate (Midwest / Mid-Atlantic) — 40–50 BTU/ft²Cold (Northeast / Northern Midwest) — 50–60 BTU/ft²Very Cold (Extreme North) — 55–65 BTU/ft² Insulation Level Poor — Older home, drafty windowsAverage — Standard insulationGood — Well-insulated, newer windowsExcellent — Energy-efficient, tight envelope Sun Exposure Heavily ShadedModerate ShadingFull Sun — Many west/south windows Furnace Configuration Furnace Type Single-StageTwo-StageModulating / Variable-Speed Fuel Type Natural GasPropaneFuel OilElectric AFUE Efficiency 80% (Standard)82%85%90%92%95% (High-Efficiency)97% (Premium) Safety Margin % Cost Details Furnace Cost per 1,000 BTU $ Installation Labor $ Additional Cost $ Summary Detailed Breakdown Furnace Sizing Summary Recommended Furnace: — Conditioned Floor Area— Ceiling Volume— Climate Zone— Insulation Level— Base BTU Factor— Adjusted BTU Factor— Heating Load (before margin)— Safety Margin— Required Input Capacity— Recommended Furnace Size— Furnace Type— AFUE Efficiency— Effective Output— Oversizing Risk— Estimated Annual Heating Cost— Furnace Equipment Cost— Installation Labor— Additional Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Furnace Size Calculator: Find the Right BTU and Efficiency This furnace size calculator estimates the heating capacity your home needs. Enter floor area, ceiling height, window area and door count, then pick a climate zone and insulation level. The tool returns recommended BTU input, effective output, oversizing risk, annual heating cost and installed price. It covers single-stage, two-stage and modulating furnaces running on natural gas, propane, oil or electric, with AFUE ratings from 80% to 97%. A furnace that’s too small runs constantly and never gets the house warm. One that’s too big cycles on and off, wastes fuel, and wears out faster. This furnace size calculator helps you find the right capacity before you buy. It takes the home’s conditioned floor area, ceiling height, window area and door count, then adjusts for climate zone, insulation quality and sun exposure. The result is a recommended BTU input and a standard furnace size you can actually order. Use it to compare quotes, check a contractor’s recommendation, or plan a replacement before the old unit fails.   How to Use the Furnace Size Calculator Pick the unit system: imperial (ft² / °F) or metric (m² / °C). Enter the conditioned floor area and ceiling height. Add the number of exterior doors and total window area. Choose your climate zone from the dropdown. Set the insulation level that matches your home. Pick the sun exposure based on window orientation. Select furnace type, fuel type and AFUE rating. Adjust the safety margin, then enter equipment and labor costs. The Summary tab leads with recommended furnace size and oversizing risk. Detailed Breakdown lists every multiplier and load behind the result.   How the Furnace Size Calculator Formula Works The calculation starts with a base BTU factor per square foot, adjusted for climate, insulation and sun. Then it adds infiltration loads from doors and windows, applies a safety margin, and divides by AFUE to find the required input capacity. Formula: Adjusted BTU factor = Climate base × Insulation multiplier × Sun multiplierFormula: Heating load = Floor area × Adjusted BTU factorFormula: Total load = Heating load + (Doors × 1,000 BTU) + (Window area × 1.5 BTU)Formula: Required input = Total load × (1 + Safety %) ÷ AFUEFormula: Recommended size = Smallest standard furnace size above required input Climate base factors run from 32 BTU/ft² in warm zones to 60 BTU/ft² in very cold zones. Insulation multipliers range from 1.25 for poor insulation down to 0.72 for an excellent envelope. Sun exposure adjusts by 0.95 for shaded homes up to 1.08 for full sun. Those three multipliers stack, so a poorly insulated home in a cold climate can need nearly twice the BTU per square foot of a tight, shaded home in a warm zone. Standard furnace sizes run 40,000 to 200,000 BTU input. The tool picks the smallest size that meets the required input, then reports the effective output, which is that size multiplied by AFUE. It also calculates oversizing as the percentage of effective output above the total heating load. A result under 15% is well sized. Up to 30% is slightly oversized. Above 30% is significantly oversized. Annual heating cost comes from the recommended size, full-load hours for the climate zone, fuel cost per million BTU, and AFUE. Full-load hours range from 1,200 in warm climates to 2,800 in very cold ones. Fuel costs are approximate US averages and should be replaced with local rates.   Worked Example: A 1,800 ft² Home in a Moderate Climate Say you’re sizing a furnace for a 1,800 ft² home with 8 ft ceilings, three exterior doors, and 180 ft² of windows. Moderate climate, average insulation, moderate shading. You want a 95% AFUE two-stage furnace with a 15% safety margin. Equipment cost is $0.80 per 1,000 BTU, labor is $1,200. Floor area: 1,800 ft² Ceiling volume: 1,800 × 8 = 14,400 ft³ Climate base: 45 BTU/ft² Insulation (average): × 1.00 Sun (moderate): × 1.00 Adjusted BTU factor: 45 × 1.00 × 1.00 = 45.0 BTU/ft² Heating load: 1,800 × 45.0 = 81,000 BTU Door load: 3 × 1,000 = 3,000 BTU Window load: 180 × 1.5 = 270 BTU Total load: 81,000 + 3,000 + 270 = 84,270 BTU Safety

Work out how many boxes of flooring a room needs. Enter the dimensions, pick a material, and get boxes, underlayment, trim and a total cost estimate. Unit System Metric (m² / m)Imperial (ft² / ft) Room Details Room Shape RectangleL-Shape (Corner Cutout)Direct Area Entry Number of Identical Rooms rooms Room Length m Room Width m Overall Length m Overall Width m Cutout Length m Cutout Width m Total Floor Area (all rooms) m² Total Room Perimeter m Flooring Material Flooring Type Coverage per Box m² Waste Factor % Plank / Tile Length m Plank / Tile Width m Underlayment & Trim Underlayment Coverage per Roll m² Total Door Width to Deduct m Trim Piece Length m Cost Details Cost per Box $ Underlayment Cost per Roll $ Cost per Trim Piece $ Adhesive / Mortar per m² $ Labor per m² $ Additional Cost $ Summary Detailed Breakdown Flooring Summary Total Area: — Room Shape— Number of Rooms— Floor Area (each room)— Total Floor Area— Waste Factor— Area with Waste— Flooring Type— Coverage per Box— Boxes Required— Pieces per Box— Total Pieces Required— Underlayment Rolls— Trim Length Required— Trim Pieces Required— Flooring Material Cost— Underlayment Cost— Trim Cost— Adhesive / Mortar Cost— Labor Cost— Additional Cost— Cost per m²— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Flooring Calculator: Boxes, Underlayment and Total Cost Flooring is sold in boxes, not square feet, and every material covers a different area per box. This flooring calculator works out how many boxes you need from the room dimensions and the material you’re installing. It handles rectangles, L-shapes, and direct area entry, then adds waste, calculates underlayment rolls, and counts trim pieces by perimeter. Ten flooring types are included: solid hardwood, engineered, laminate, luxury vinyl plank, ceramic tile, porcelain tile, vinyl sheet, carpet tile, broadloom carpet, and custom. The tool loads coverage per box and plank dimensions automatically for each. Enter your local prices and it returns the full cost with a per-square-metre or per-square-foot breakdown.   How to Use the Flooring Calculator Pick the unit system: metric (m² / m) or imperial (ft² / ft). Choose the room shape: rectangle, L-shape, or direct area. Enter the dimensions. Rectangle uses length and width. Set how many identical rooms you’re flooring. Pick the flooring type from the dropdown. Coverage loads automatically. Adjust the waste factor. Ten percent is the standard starting point. Set underlayment coverage, door width to deduct, and trim piece length. Enter your prices for flooring, underlayment, trim, adhesive, and labor. The Summary tab shows total area, boxes, underlayment rolls, trim, and total cost. Detailed Breakdown lists every intermediate figure.   How the Flooring Calculator Formula Works Flooring quantity comes from area divided by coverage, with waste added. Trim comes from perimeter, minus door openings. Formula: Rectangle area = Length × WidthFormula: L-shape area = (Overall length × Overall width) − (Cutout length × Cutout width)Formula: Total area = Room area × Number of roomsFormula: Area with waste = Total area × (1 + Waste %)Formula: Boxes needed = ⌈ Area with waste ÷ Coverage per box ⌉Formula: Pieces per box = ⌊ Coverage per box ÷ Area per piece ⌉Formula: Total pieces = ⌈ Area with waste ÷ Area per piece ⌉Formula: Underlayment rolls = ⌈ Total area ÷ Coverage per roll ⌉Formula: Trim length = Total perimeter − Door widthFormula: Trim pieces = ⌈ Trim length ÷ Trim piece length ⌉ Waste applies to flooring, not to underlayment. Underlayment rolls are calculated from the bare room area, since underlayment is easier to piece together and doesn’t need pattern waste. Trim is calculated from perimeter with door widths deducted, since a door doesn’t need trim. The L-shape uses the outer rectangle minus the cutout rectangle. That’s the common corner-cutout shape for a room that wraps around a closet, staircase, or exterior corner. The perimeter formula for an L-shape is the same as the outer rectangle’s perimeter because the cutout adds and removes equal edges. Piece counts matter for plank and tile. A box of laminate covers 2.23 m² and holds about 10 planks, so a 30 m² floor with waste needs 15 boxes and about 149 planks. The tool reports both, since some installers like to know the plank count for layout planning.   Worked Example: Three 5 m × 4 m Bedrooms, Laminate Say you’re flooring three bedrooms, each 5 m long and 4 m wide, with laminate. Coverage is 2.23 m² per box. Waste factor is 10%. Underlayment roll covers 15 m². Trim piece is 2.4 m long. One door per room, 0.9 m wide. Costs: $35 per box, $25 per underlayment roll, $12 per trim piece, $3 per m² adhesive, $15 per m² labor. Room area: 5 × 4 = 20.00 m² Total area: 20 × 3 = 60.00 m² Room perimeter: 2 × (5 + 4) = 18.00 m Total perimeter: 18 × 3 = 54.00 m With 10% waste: 60 × 1.10 = 66.00 m² Boxes: ⌈66 ÷ 2.23⌉ = 30 boxes Area per plank: 1.20 × 0.19 = 0.228 m² Pieces per box: ⌊2.23 ÷ 0.228⌉ = 10 planks Total planks: ⌈66 ÷ 0.228⌉ = 290 planks Underlayment rolls: ⌈60 ÷ 15⌉ = 4 rolls Trim length (one door per room): 54 − (3 × 0.9) = 51.30 m Trim pieces: ⌈51.30 ÷ 2.4⌉ = 22 pieces Flooring cost: 30 × $35 = $1,050 Underlayment cost: 4 × $25 = $100 Trim cost: 22 × $12 = $264

Work out floor area ratio and ground coverage for a plot. Enter the building footprint, floors and zoning limits, then see FAR, compliance and cost. Unit System Metric (m² / m)Imperial (ft² / ft) Plot Details Plot Input Mode Enter Plot Area DirectlyEnter Length × Width Plot Length m Plot Width m Plot Area m² Building Configuration Ground Floor Footprint m² Number of Upper Floors floors Upper Floor Area Same as Ground FootprintCustom Area Typical Upper Floor Area m² Basement / Stilt / Parking Area m² Count Basement / Stilt in FAR? No — Excluded from FARYes — Included in FAR Zoning Regulations Max Permitted FAR ratio Max Ground Coverage % Cost Details Construction Cost per m² $ Land Cost $ Additional Cost $ Summary Detailed Breakdown FAR Summary Floor Area Ratio: — Plot Area— Ground Floor Footprint— Number of Upper Floors— Typical Upper Floor Area— Basement / Stilt Area— Total Built-up Area— FAR-Counted Floor Area— Floor Area Ratio (FAR)— Ground Coverage— Max Permitted FAR— Max Ground Coverage— Permissible Floor Area— FAR Utilisation— Remaining FAR Allowance— Compliance Status— Construction Cost— Land Cost— Cost per FAR Unit— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT FAR Calculator: Floor Area Ratio, Coverage and Compliance Floor area ratio is the single number that decides how much building a plot can hold. This FAR calculator works it out from the plot area and the total floor area you’re planning, then checks the result against the zoning caps you enter. It also returns ground coverage, permissible floor area, remaining allowance, and compliance status in plain language. Enter the plot area directly or as length by width. Add the ground floor footprint, how many upper floors, and whether a basement or stilt counts toward FAR. The tool handles the arithmetic, including the case where basement area exists but sits outside the FAR calculation. Costs come through as construction, land, and total, with a cost-per-FAR-unit figure at the end. Metric and imperial units switch cleanly.   How to Use the FAR Calculator Pick the unit system: metric (m² / m) or imperial (ft² / ft). Choose how to enter the plot. Direct area or length × width. Enter the plot area, or the two dimensions. Type the ground floor footprint. Set how many upper floors the building has. Choose whether upper floors match the footprint or use a custom area. Add basement or stilt area if it exists, and decide whether it counts toward FAR. Enter the zoning limits, then the construction and land costs. The Summary tab shows FAR, coverage, compliance, and cost in one card. Detailed Breakdown lists every area and ratio behind the result.   How the FAR Calculator Formula Works FAR is total floor area divided by plot area. Coverage is the ground floor footprint as a percentage of the plot. Formula: Plot area = Length × Width (dimensions mode)Formula: Total built-up area = Footprint + (Upper floors × Upper floor area) + BasementFormula: FAR-counted area = Footprint + Upper total + (Basement if included)Formula: FAR = FAR-counted area ÷ Plot areaFormula: Ground coverage = (Footprint ÷ Plot area) × 100Formula: Permissible area = Max FAR × Plot areaFormula: FAR utilisation = (FAR ÷ Max FAR) × 100Formula: Remaining allowance = Permissible area − FAR-counted area Basement handling is the part that surprises people. Many zoning codes exclude basement and stilt parking from FAR entirely. Others include it. The calculator gives you a toggle so the same building can produce two different FAR figures depending on the local rule. Compliance is a simple comparison. If FAR is above the max, or coverage is above the max, the result is flagged. If both caps are met, it passes. If no caps are entered, the tool says limits were not specified and skips the check. Cost runs on the built-up area, not the FAR-counted area. That’s because you pay for every square metre you construct, even if some of it doesn’t count toward FAR. The cost per FAR unit figure uses the FAR-counted area instead, since it’s meant to compare the value of usable floor area across schemes.   Worked Example: A 400 m² Plot With a G+3 Building Say you have a 400 m² plot. Ground footprint is 200 m². Three upper floors, each matching the footprint. No basement. Max FAR is 2.0. Max coverage is 60%. Construction cost is $1,200 per m². Land cost is $400,000. Plot area: 400 m² Footprint: 200 m² Upper floors: 3 × 200 = 600 m² Total built-up area: 200 + 600 = 800 m² FAR-counted area (no basement): 800 m² FAR: 800 ÷ 400 = 2.000 Coverage: (200 ÷ 400) × 100 = 50.00% Permissible area: 2.0 × 400 = 800 m² FAR utilisation: (2.0 ÷ 2.0) × 100 = 100.0% Remaining allowance: 0 m² Compliance: at the FAR limit and under the coverage limit, so compliant Construction cost: 800 × $1,200 = $960,000 Total cost: $960,000 + $400,000 = $1,360,000 Cost per FAR unit: $1,360,000 ÷ 800 = $1,700 per m² The scheme sits exactly at the FAR cap, which means any additional floor area would exceed it. The coverage of 50% leaves headroom under the 60% cap, so the ground floor could grow without breaking coverage rules, but FAR would break first. That’s the kind of tension the calculator exists to surface. Frequently Asked Questions What is FAR in construction? Floor Area Ratio is the total floor area of a building divided by the plot area. A

Work out how deep to bury fence posts, the right hole size and the concrete needed. Enter post size, soil type and frost depth for a full footing estimate. Unit System Metric (mm / m)Imperial (in / ft) Post Details Post Size (preset) Post Width / Diameter mm Post Profile Square / RectangularRound Height Above Ground m Number of Posts posts Soil & Climate Soil Type Normal / LoamClay (Moderate Drainage)Sandy / LooseCompacted Fill / Made GroundRocky / Hardpan Frost Line Depth (0 = none) m Footing & Hole Hole Diameter Mode Auto (3 × post width)Manual Override Hole Diameter mm Footing Material Concrete MixFast-Set Post ConcreteGravel BackfillNative Soil (No Fill) Bag Size Cost Details Post Cost per m $ Cost per Bag $ Gravel Cost per m³ $ Labor Cost per Post $ Additional Cost $ Summary Detailed Breakdown Post Depth Summary Burial Depth: — Post Size— Height Above Ground— Recommended Burial Depth— Governing Rule— Total Post Length (each)— Total Post Length (all posts)— Hole Diameter— Hole Depth— Net Fill Volume per Hole— Total Fill Volume— Footing Material— Bags per Hole— Total Bags— Number of Posts— Post Material Cost— Footing Cost— Labor Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Fence Post Depth Calculator: Burial Depth, Hole Size and Concrete Fence posts fail at the base, not the top. A post that sits too shallow in sandy soil will lean within a season. This fence post depth calculator works out the burial depth your posts actually need, given the height above ground, the soil type, and the local frost line. It also sizes the hole, subtracts the post’s own volume, and returns the concrete or gravel needed to fill it. Pick a post preset or enter your own dimensions. Choose square or round. The tool loads a footing plan with the governing rule shown in plain language, whether that’s the standard third rule, the frost line, or the absolute minimum. Then it prices the posts, the concrete, and the labour per post, so you can see cost per post rather than a lump sum that hides the details. Metric and imperial units convert on the fly.   How to Use the Fence Post Depth Calculator Pick the unit system: metric (mm / m) or imperial (in / ft). Choose a post size preset. Custom sizes are allowed. Enter the height of the post above ground. Set how many posts are in the run. Pick the soil type. Sandy soil needs deeper burial than rock. Enter the frost line depth for your area. Zero if there’s no frost. Confirm the hole diameter, or leave it in auto mode. Choose the footing material, then enter your unit costs. The Summary tab shows burial depth first, with hole size and bags below. Detailed Breakdown lists every intermediate value.   How the Fence Post Depth Calculator Works Burial depth comes from three competing requirements. The calculator picks the deepest one, since that’s the rule that governs the job. Formula: Base burial = Height above ground × 0.5Formula: Soil-adjusted burial = Base × Soil factorFormula: Frost requirement = Frost depth + 0.15 mFormula: Absolute minimum = 0.45 m (rocky) or 0.60 m (other soils)Formula: Burial depth = max(soil-adjusted, frost requirement, absolute minimum)Formula: Total post length = Height above ground + Burial depth That 0.5 multiplier isn’t arbitrary. It buries one third of the total post, which is the classic rule for fence posts. If above-ground height is two thirds of the post, then the buried third is half the above-ground figure. A 1.8 m post above ground buries 0.9 m. Soil factors scale the base. Normal loam is 1.00. Clay is 1.10. Compacted fill is 1.25. Sandy or loose soil is 1.30, the largest multiplier because it holds the least. Rocky or hardpan is 0.75, which reflects how hard it is to dig and how little the surrounding material can move. Frost is the rule that catches people by surprise. When frost depth is greater than zero, the calculator adds a 150 mm (about 6 in) margin and treats that as a minimum. In cold climates, this often drives the depth well past the third rule. A 900 mm frost line means the footing needs to sit at 1,050 mm minimum. The hole diameter auto-sizes at three times the post width, floored at 150 mm. That gives enough room for the fill material to surround the post. You can override it if your auger only comes in specific sizes. Net fill volume is hole volume minus post volume. The tool computes each separately with the right geometry, then subtracts. The result is the actual material you’d buy, not the total hole volume that includes the post itself. Bags come from net fill divided by bag yield. Yields are entered in cubic metres (metric) or cubic feet (imperial), based on standard bag sizes. Round up to whole bags.   Worked Example: Ten 100 mm Posts, 1.8 m Above Ground, Normal Soil Say you’re setting ten 100 mm square posts, each 1.8 m above ground, in normal loam with a 600 mm frost line. Hole diameter is auto. Footing is 25 kg concrete bags. Costs: $4 per metre of post, $8 per bag, $5 per post labour. Base burial: 1.8 × 0.5 = 0.900 m Soil factor (normal): 1.00 Soil-adjusted burial: 0.900 × 1.00 = 0.900 m Frost requirement: 0.600 + 0.150 = 0.750 m Absolute minimum: 0.600 m Burial depth: max(0.900, 0.750, 0.600) = 0.900 m

Work out the fenced length, post count, rails and cost for a rectangular yard. Pick the sides to fence, then get posts, gates and a full material quote. Unit System Metric (metres)Imperial (feet) Rectangle Dimensions Side A (Length) m Side B (Width) m Sides to Fence All 4 Sides (Full Perimeter)3 Sides — One A Side Open3 Sides — One B Side Open2 Sides (A Sides Only)2 Sides (B Sides Only)1 Side (A Only)1 Side (B Only) Posts, Rails & Height Post Spacing (on centre) m Post Height m Rails per Section 1 Rail2 Rails3 Rails4 Rails Gates & Openings Number of Gates gates Gate Width (each) m Cost Details Cost per Post $ Cost per Rail $ Cost per Linear m $ Cost per Gate $ Concrete per Post $ Labor per m $ Additional Cost $ Summary Detailed Breakdown Rectangle Fence Summary Fenced Length: — Full Rectangle Perimeter— Fenced Length— Net Fence Run (excl. gates)— Sides Fenced— Rectangle Area— Diagonal— Post Spacing (actual)— Number of Posts— Number of Sections— Number of Rails— Number of Gates— Material Cost— Labor Cost— Cost per Unit Length— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Rectangle Fence Calculator: Perimeter, Posts and Cost This rectangle fence calculator works out the fenced perimeter of a rectangular property, then counts posts, rails, gates, and cost. Enter side A and side B, pick which sides get fencing, and the tool does the rest. It handles full-perimeter runs, three-sided yards with an open front, and partial runs where only one or two sides need fence. Set the post spacing, rail count, and gate width, then add your unit prices. The output covers fenced length, actual spacing, post count, section count, net run after gates, material cost, labor, and a total. It switches between metric and imperial units and converts the existing values when you do.    How to Use the Rectangle Fence Calculator Pick the unit system: metric (metres) or imperial (feet). Enter side A, the longer dimension of the rectangle. Enter side B, the shorter dimension. Choose which sides to fence. All four, three sides, two, or one. Confirm the post spacing and post height. 2.4 m and 1.8 m are common defaults. Set how many rails run between each post. Add the number of gates and gate width. Enter cost per post, rail, linear unit, gate, concrete, and labor rate. The Summary tab leads with fenced length and post count. Detailed Breakdown lists every line item, including diagonal and area.   How the Rectangle Fence Calculator Works A rectangle has four sides. Fencing all four is a closed loop. Fencing three or fewer is an open run with two ends. Formula: Full perimeter = 2 × (Side A + Side B)Formula: Fenced length = (A × A-sides) + (B × B-sides)Formula: Diagonal = √(A² + B²)Formula: Posts (closed loop) = max(4, ⌈ Fenced length ÷ Spacing ⌉)Formula: Posts (open run) = ⌈ Fenced length ÷ Spacing ⌉ + 1Formula: Sections = Posts − 1 (open run) or Posts (closed loop)Formula: Actual spacing = Fenced length ÷ SectionsFormula: Rails = Sections × Rails per sectionFormula: Net fence run = Fenced length − Total gate width The closed-loop case uses one fewer post than a naive count. Four sides of fence meet at four corners, and each corner post serves two sides. So a closed rectangle with 20 posts has 20 sections, not 21. That’s why the tool returns posts equal to sections for the all-four option. The open case adds one post at the starting end. A three-sided yard with two open ends needs a post at each end, so the count is bays plus one. Fenced length drives everything. Area and diagonal are computed for reference but don’t feed the material counts. Gates subtract from the fenced length for the linear material cost, since a gate gap doesn’t get fence boards. Cost comes from four inputs: posts, rails, linear fence material, and gates. Concrete per post is added to material cost. Labor is billed on the full fenced length, not the net run, since the gate posts still get set.   Worked Example: A 14 m × 9 m Backyard, All Four Sides Say you’re fencing a rectangular backyard. Side A is 14 m, side B is 9 m. All four sides get fence. Post spacing is 2.4 m. Two rails per section. One gate at 1.0 m. Costs: $18 per post, $9 per rail, $12 per metre of fence material, $120 per gate, $6 concrete per post, $25 per metre labor. Full perimeter: 2 × (14 + 9) = 46.00 m Fenced length (all 4 sides): (14 × 2) + (9 × 2) = 46.00 m Diagonal: √(14² + 9²) = √277 = 16.64 m Posts (closed loop): max(4, ⌈46 ÷ 2.4⌉) = max(4, 20) = 20 posts Sections: 20 sections (closed loop) Actual spacing: 46 ÷ 20 = 2.30 m Rails: 20 × 2 = 40 rails Net fence run: 46 − 1.0 = 45.00 m Post cost: 20 × $18 = $360 Rail cost: 40 × $9 = $360 Fence material cost: 45 × $12 = $540 Gate cost: 1 × $120 = $120 Concrete cost: 20 × $6 = $120 Material cost: $1,500 Labor cost: 46 × $25 = $1,150 Total: $2,650 Cost per metre: $57.61 Twenty posts for a 46 m perimeter. The actual spacing comes in at 2.30 m, tighter than the 2.4 m target, which is normal when bays round

Work out fence posts, rails, pickets or panels and cost. Enter the run length, pick a fence type, and get material quantities, labor and total cost. Unit System Metric (metres)Imperial (feet) Fence Details Fence Type Wood Privacy (Solid Picket)Wood Picket (Spaced)Chain LinkVinyl / PVC PanelAluminum / Steel OrnamentalComposite Panel Total Fence Length m Fence Height m Posts, Rails & Pickets Post Spacing (on centre) m Rails per Section 1 Rail2 Rails3 Rails4 Rails Picket / Panel Width m Gap Between Pickets m Gates & Openings Number of Gates gates Gate Width m Cost Details Cost per Post $ Cost per Rail $ Cost per Picket $ Cost per Gate $ Concrete Cost per Post $ Labor Cost per m $ Additional Cost $ Summary Detailed Breakdown Fence Material Summary Total Fence Cost: — Fence Type— Total Fence Length— Fence Height— Post Spacing (actual)— Number of Posts— Number of Sections (Bays)— Number of Rails— Pickets Required— Number of Gates— Material Cost— Labor Cost— Cost per Unit Length— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Fence Calculator: Posts, Rails, Pickets and Total Cost A fence estimate comes down to five numbers: posts, rails, pickets or panels, gates, and concrete. Get the post count wrong and the whole layout shifts. This fence calculator works through all five from the run length, post spacing, and fence type. Pick wood privacy, spaced picket, chain link, vinyl, ornamental, or composite, and the tool loads the default spacing and rail count for that style. Enter the cost per post, per rail, per picket or panel, per gate, and per post of concrete, and the total cost builds itself. Labor can be a flat rate per metre or per foot. The output also gives the cost per linear unit, which is the number most people compare against a contractor quote. It works in metric or imperial units and recalculates on every change.   How to Use the Fence Calculator Pick your unit system: metric (metres) or imperial (feet). Choose a fence type from the dropdown. Defaults load automatically. Enter the total fence run length. Set the fence height. Confirm the post spacing. 2.4 m or 8 ft is standard for wood privacy. Pick how many rails per section. Two rails is typical. Set the picket width and gap. These are disabled for panel fences. Add gates and gate width, then enter your unit costs and labor rate. The Summary tab leads with total cost and material counts. Detailed Breakdown lists every quantity and cost line.   How the Fence Calculator Formula Works Fence math starts with how many bays fit along the run. Each bay sits between two posts. Formula: Bays = [ Total length ÷ Post spacing ]Formula: Posts = Bays + 1Formula: Actual spacing = Total length ÷ BaysFormula: Rails = Bays × Rails per sectionFormula: Pickets per bay = ⌊ (Actual spacing + Gap) ÷ (Picket width + Gap) ⌋Formula: Total pickets = Pickets per bay × BaysFormula: Material cost = (Posts × Cost per post) + (Rails × Cost per rail) + (Items × Cost per item) + (Gates × Cost per gate) + (Posts × Concrete per post)Formula: Total cost = Material + (Length × Labor rate) + Additional The bay count rounds up, so the actual spacing comes out slightly shorter than the target. A 30 m run at 2.4 m spacing gives 13 bays and 14 posts, with actual spacing of 2.31 m. That’s the correct way to lay out a fence. The posts land at even intervals, and the last bay isn’t an odd short piece. Picket count uses the pitch between pickets, which is picket width plus gap. The formula adds one extra gap so the first and last picket sit flush with the posts. For a 2.31 m bay with 0.14 m pickets and 0.02 m gaps, the count is 14 pickets per bay. Panel fences (chain link, vinyl, ornamental, composite) skip the picket math. One panel fills each bay. The fence type dropdown loads sensible defaults: rails per section, post spacing, picket size, gate width. Change the type and the fields update. You can override any of them.   Worked Example: A 30 m Wood Privacy Fence Say you’re pricing a 30 m wood privacy fence, 1.8 m tall, with one gate. Post spacing is 2.4 m, two rails per section. Pickets are 0.14 m wide with a 0.02 m gap. Costs are $18 per post, $9 per rail, $2.50 per picket, $120 per gate, $6 per post of concrete, and $25 per metre of labor. Bays: ⌈ 30 ÷ 2.4 ⌉ = 13 sections Posts: 13 + 1 = 14 Actual spacing: 30 ÷ 13 = 2.31 m Rails: 13 × 2 = 26 rails Pitch: 0.14 + 0.02 = 0.16 m Pickets per bay: ⌊ (2.31 + 0.02) ÷ 0.16 ⌋ = ⌊ 14.56 ⌋ = 14 pickets Total pickets: 14 × 13 = 182 pickets Post cost: 14 × $18 = $252 Rail cost: 26 × $9 = $234 Picket cost: 182 × $2.50 = $455 Gate cost: 1 × $120 = $120 Concrete cost: 14 × $6 = $84 Material cost: $1,145 Labor cost: 30 × $25 = $750 Total cost: $1,895 Cost per metre: $63.17 That’s $63 per metre for a mid-grade wood privacy fence, materials and labor. The picket count is the biggest material line, which is typical. A spaced picket fence with wider gaps would cut that significantly. Frequently Asked Questions

This mortgage calculator shows interest and time saved with extra payments. Enter your loan details to instantly compare standard vs. accelerated payoff. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Surface Dimensions Surface Length ftinmcmmmyd Surface Width ftinmcmmmyd Number of Areas areasrooms Epoxy Details Epoxy Type Standard Epoxy (2:1 or 1:1)Tabletop EpoxyCasting EpoxyCoating / Floor EpoxyMetallic EpoxyPolyasparticCustom Ratio Epoxy Coverage Rate ft²/gal @ 1 milm²/L @ 1 mil Coating Thickness milsmmin Mix Ratio (Part A : Part B) 2:1 (Resin : Hardener)1:1 (Equal Parts)3:14:15:110:1 Number of Coats coats Waste Factor % Cost Details Price per Gallon (Kit) $ per gallonper literper kit Tools / Prep Cost $ total Labor Cost $ totalper ft²per m² Summary Detailed Breakdown Epoxy Summary Total Epoxy Needed: — Epoxy Type— Surface Area (per area)— Total Surface Area— Effective Coverage— Epoxy Volume (base)— Epoxy Volume (with waste)— Mix Ratio— Part A (Resin) Required— Part B (Hardener) Required— Kits Needed— Estimated Epoxy Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Epoxy Calculator: Resin, Hardener and Cost This epoxy calculator figures out how much resin and hardener a project needs. Enter the surface area, coating thickness, and mix ratio. It returns total epoxy volume, Part A and Part B amounts, kit count, and cost. Use it for floors, countertops, castings, and tabletop pours. Epoxy comes as two parts. Mix them wrong and the cure fails. Mix too little and you stop mid-pour. Mix too much and the extra kicks off in the bucket. This tool does the volume math so you can focus on prep and application. It handles standard 2:1 and 1:1 systems, plus 3:1 through 10:1. Coverage rate and thickness drive the volume. The mix ratio splits the total into resin and hardener. Measure the surface, pick your thickness, and enter the coverage from the product data sheet. The calculator rounds to whole kits so you order what’s actually sold.   How to Use the Epoxy Calculator Pick your currency from the top dropdown. Enter surface length and width, then set the unit. Add how many areas you’re coating. Choose an epoxy type. The label doesn’t change the math. Type the coverage rate from the product data sheet. Set the coating thickness in mils, millimeters, or inches. Pick the mix ratio. 2:1 is common for coatings. Adjust coats, waste, and price, then read the total. The Summary tab shows total epoxy and kit count. Detailed Breakdown lists Part A, Part B, and every conversion.   How the Epoxy Calculator Formula Works Epoxy volume starts with area and thickness. Coverage tells you how far one gallon spreads. Thickness scales that coverage down. Formula: Total area = Length × Width × Number of areasFormula: Effective coverage = Coverage rate ÷ Thickness in milsFormula: Gallons per coat = Total area ÷ Effective coverageFormula: Gallons with waste = Gallons per coat × Coats × (1 + Waste %)Formula: Part A = Total gallons × (A ratio ÷ Total ratio)Formula: Part B = Total gallons × (B ratio ÷ Total ratio) Coverage rate is entered as square feet per gallon at one mil. A product that covers 1,600 ft² per gallon at 1 mil covers 160 ft² at 10 mils. The tool divides by the thickness in mils. If you enter thickness in millimeters or inches, it converts to mils first. One mil is one thousandth of an inch. Mix ratio splits the total volume. In a 2:1 system, Part A is two-thirds of the total and Part B is one-third. The calculator shows both amounts in gallons and liters. Kit count rounds up to the next whole gallon. It also suggests the closest standard kit size from 0.5, 1, 1.5, 2, 3, and 5 gallons. Cost comes from price per gallon, per liter, or per kit. Labor can be a flat fee or a rate per square foot or meter.   Worked Example: An 18 ft × 14 ft Garage Floor Say you’re coating an 18 ft by 14 ft garage floor. One area. Thickness is 10 mils. Coverage is 1,600 ft² per gallon at 1 mil. Two coats. Waste factor is 8%. Mix ratio is 2:1. Price is $85 per gallon. Area: 18 × 14 = 252.00 ft² Effective coverage: 1,600 ÷ 10 = 160.00 ft²/gal Gallons per coat: 252 ÷ 160 = 1.575 gal Gallons for two coats: 1.575 × 2 = 3.150 gal With 8% waste: 3.150 × 1.08 = 3.402 gal Liters: 3.402 × 3.78541 = 12.88 L Part A (2:1): 3.402 × (2/3) = 2.268 gal Part B (2:1): 3.402 × (1/3) = 1.134 gal Kits needed: ⌈3.402⌉ = 4 kits Recommended kit size: 5 gal Epoxy cost: 3.402 × $85 = $289.17 Four kits cover the floor with a small buffer. The 2:1 split means 2.268 gallons of resin and 1.134 gallons of hardener. Those are the numbers you take to the supplier. Understanding Epoxy Calculations: Full Guide How Much Epoxy Do I Need for a Floor? Multiply floor area by the desired thickness, then divide by the coverage rate. A 500 ft² floor at 10 mils needs about 3.125 gallons if the product covers 160 ft² per gallon at that thickness. Add waste and round up to the next kit.

Work out how much deck stain a project needs. Enter deck size and extra surfaces, pick stain type and coats, then get gallons, coverage and total cost. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Deck Dimensions Deck Length ftinmcmmmyd Deck Width ftinmcmmmyd Number of Deck Sections sections Additional Surfaces Railing Area ft²m² Stairs / Steps Area ft²m² Siding / Fence Area ft²m² Stain Details Stain Type Transparent / Clear StainSemi-Transparent StainSemi-Solid StainSolid Color StainOil-Based StainWater-Based StainClear Sealer Number of Coats coats Waste Factor % Cost Details Price per Gallon $ per gallonper liter Applicator / Tools Cost $ total Labor Cost $ totalper ft²per m² Summary Detailed Breakdown Deck Stain Summary Stain Needed: — Stain Type— Deck Area— Other Areas— Total Area to Stain— Coverage Rate— Stain Volume (base)— Stain Volume (with waste)— Number of Coats— Total Gallons Needed— Stain Cost— Tools / Applicator Cost— Labor Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Deck Stain Calculator: Gallons, Coverage and Total Cost This deck stain calculator estimates how much stain a project needs. Enter deck length and width, add railing or stair area, then choose a stain type and coat count. The tool returns total square footage, coverage rate, gallons with waste, and a full cost estimate. It works for transparent, solid, oil, and water-based stains. A deck stain order is easy to get wrong. Buy too little and you stop mid-board to chase another gallon. Buy too much and the extra sits in the garage until it separates. Stain coverage varies with the product, the wood, and how many coats you apply. This deck stain calculator folds those variables into one number so the trip to the store only happens once. It also handles railing, stairs, and siding, which are the surfaces most people forget when they estimate by deck floor area alone.   How to Use the Deck Stain Calculator Pick your currency from the top dropdown. Enter the deck length and width, then set the unit for each. Add how many deck sections you’re staining. Enter railing, stair, and siding area if those surfaces are part of the job. Choose a stain type from the dropdown. Set the number of coats. Two is the common default. Adjust the waste factor if your wood is rough or absorbent. Add the price per gallon or liter, then enter tool and labor cost. The Summary tab leads with gallons needed. Detailed Breakdown lists every area and conversion behind the result.   How the Deck Stain Calculator Formula Works Stain volume comes from area divided by coverage, then multiplied by coats and waste. Coverage depends on the stain type. Formula: Deck area = Length × Width × SectionsFormula: Total area = Deck area + Railing area + Stairs area + Siding areaFormula: Base volume = Total area ÷ Coverage rateFormula: Volume with coats = Base volume × Number of coatsFormula: Volume with waste = Volume with coats × (1 + Waste %)Formula: Gallons needed = [ Volume with waste ] Coverage rates run from 200 ft² per gallon for oil-based stain up to 350 ft² per gallon for solid color stain. Semi-transparent and clear stains sit at 250 ft² per gallon. Water-based and semi-solid stains cover about 300 ft² per gallon. Those figures assume smooth wood at one coat. The tool rounds gallons up to the next whole gallon, since stain is sold that way. Labor can be a flat total or a rate per square foot or square meter. If you enter price per liter, the tool converts it to per gallon before costing.   Worked Example: A 16 ft × 12 ft Deck With Railing and Stairs Say you’re staining a 16 ft by 12 ft deck. One section. Railing area is 40 ft². Stairs add 25 ft². No siding. Stain is semi-transparent. Two coats. Waste factor is 10%. Price is $45 per gallon. Deck area: 16 × 12 = 192.00 ft² Other areas: 40 + 25 = 65.00 ft² Total area: 192 + 65 = 257.00 ft² Coverage rate (semi-transparent): 250 ft²/gal Base volume: 257 ÷ 250 = 1.028 gal With two coats: 1.028 × 2 = 2.056 gal With 10% waste: 2.056 × 1.10 = 2.262 gal Gallons needed: 3 gal Stain cost: 2.262 × $45 = $101.79 Estimated total: $101.79 That’s a small deck, but the railing and stairs add 65 ft², which is roughly a third of the deck floor. Without them, the job would need about 2.3 gallons. With them, it needs 3. That extra gallon is the difference between finishing on Saturday and driving back to the store. Understanding Deck Stain Calculations How Much Stain Do I Need for a Deck? Divide total square footage by the coverage rate on the can, then multiply by coats and add waste. A 200 ft² deck with semi-transparent stain at 250 ft² per gallon needs 0.8 gallons per coat. Two coats plus 10 percent waste lands near 1.8 gallons, so buy 2. Railing and stairs change the number more than people expect. Railing adds surface area on both sides of every baluster. Stairs add treads, risers, and stringers. Measure them or estimate them generously, then enter them as separate areas in the

Find the right clearance hole and drill bit for any bolt. Pick the fastener, fit type and standard, then get hole size, min and max, and tap drill reference. Unit System Metric (mm)Imperial (inches) Fastener Details Fastener Size Thread Pitch mm Number of Holes holes Fit Type & Tolerance Fit Classification Close Fit (Precision)Normal / Medium FitLoose Fit (Easy Assembly) Standard ISO 273 (Metric)ANSI B18.2.8 (Imperial)Custom Tolerance Custom Clearance mm Cost Details Cost per Hole $ Cost per Drill Bit $ Additional Cost $ Summary Detailed Breakdown Clearance Hole Summary Clearance Hole: — Fastener Size— Nominal Diameter— Fit Type— Standard Applied— Clearance Hole (min)— Clearance Hole (max)— Recommended Hole Size— Recommended Drill Bit— Tap Drill Size (Reference)— Total Holes— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Clearance Hole Calculator: Drill Size for Bolts and Screws A clearance hole is the hole a bolt passes through, not the hole it threads into. It has to be big enough for the fastener to slide in without hammering, but tight enough to keep the joint from shifting. This clearance hole calculator takes the fastener size, fit type, and standard, then returns the recommended hole diameter, a min and max range, the closest standard drill bit, and the tap drill size for reference. Both metric and imperial fasteners are covered. The metric table spans M1.6 to M36. The imperial table covers #0 through 1″. Fit type is set by the standard: close, normal, or loose. Custom tolerance is available if your drawing or your shop uses different rules.   How to Use the Clearance Hole Calculator Pick your unit system. Metric uses millimeters, imperial uses inches. Choose the fastener size from the dropdown. Thread pitch fills automatically. Set the fit type. Normal is the default for most work. Pick the standard: ISO 273 for metric, ANSI B18.2.8 for imperial, or Custom. If you picked Custom, set the clearance value in the active unit. Enter how many holes you’re drilling. Add cost per hole and cost per drill bit if you want a total. Read the recommended hole size and the closest standard drill bit. The Summary tab leads with the recommended hole size. Detailed Breakdown lists the min, max, drill bit, and tap drill reference.   How the Clearance Hole Calculator Works Every clearance hole comes from a standard table. This calculator looks up the value, then shows the min and max tolerance window around it. Formula: Clearance hole = Table value (ISO 273 or ANSI B18.2.8)Formula: Hole min = Table value × 0.98Formula: Hole max = Table value × 1.02Formula: Custom hole = Fastener diameter + Custom clearanceFormula: Total cost = (Holes × Cost per hole) + Cost per drill bit + Additional cost For a standard lookup, the tolerance band is ±2 percent of the nominal hole size. That’s a reasonable approximation of the tolerance a machinist would see on a properly sized hole. For custom tolerance, the min and max are 80 percent and 120 percent of the specified clearance. The recommended drill bit is the closest match from a standard drill index. Metric indexes step in 0.1 mm increments below 3 mm and coarser above that. Imperial indexes use both numbered bits, lettered bits, and fractional sizes. The tool picks the one that lands closest to the calculated hole size, so you can buy a bit that’s actually available. The tap drill reference is the drill you’d use to tap the hole for the fastener. That’s a different hole than the clearance hole. Tap drill sizes come from standard tapping charts. They appear on the summary so you can check both numbers when you’re setting up a job.   Worked Example: A 1/2″ Bolt, Normal Fit Say you’re drilling a clearance hole for a 1/2″ UNC bolt in a steel plate. Normal fit, ANSI standard, four holes. Cost per hole is $0.50, drill bit is $12, no additional cost. Fastener: 1/2″ (0.500″) Nominal diameter: 0.5000 in Fit: Normal ANSI B18.2.8 normal clearance for 1/2″: 0.531 in Hole min: 0.531 × 0.98 = 0.5204 in Hole max: 0.531 × 1.02 = 0.5416 in Recommended drill: 17/32″ (0.5313 in) Tap drill reference: 27/64″ (0.4219 in) Number of holes: 4 Cost for holes: 4 × $0.50 = $2.00 Total cost: $2.00 + $12.00 = $14.00 The ANSI normal clearance for a 1/2″ bolt is 0.531″. That’s 17/32″. The tap drill is 27/64″, which is what you’d use if you were threading the plate rather than bolting through it. Those two numbers are commonly confused, and the tool shows them side by side so you can tell them apart before you drill. Frequently Asked Questions What is a clearance hole? It’s the hole a bolt passes through. It’s larger than the bolt so the fastener slides in without threading. Clearance holes are through holes; tap drills are for threads.   What size clearance hole for a bolt? It depends on the fit class and standard. A 1/2″ bolt uses 0.531″ for normal fit under ANSI B18.2.8 and 0.531″ for close fit. Metric M10 bolts use 11.0 mm for normal and 10.5 mm for close under ISO 273.   What’s the difference between a clearance hole and a tap drill? A clearance hole is bigger than the bolt so it passes through. A tap drill is smaller so the threading tap has material to cut into. Using the wrong one ruins the joint.   How do I pick a drill bit for a clearance hole? Find

Work out how big a chicken coop and run need to be. Enter flock size, breed, and time spent inside, then get indoor area, run area and cost estimate. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Flock Details Number of Chickens chickens Chicken Type / Size Standard / Dual PurposeLarge / Heavy BreedBantam (Small) Time Spent in Coop Full Time (Confined)Part Time (Some Free Range)Night Only (Mostly Free Range) Coop Size Requirements Space per Chicken (Indoor) ft²m² Run Space per Chicken ft²m² Nesting Boxes Auto (1 per 4-5 hens)Manual Preferred Coop Dimensions Coop Length ftinmcmmm Coop Width ftinmcmmm Coop Height ftinmcmmm Cost Details Price per Unit Area (Coop) $ per ft²per m² Price per Run Area $ per ft²per m² Additional Cost $ total Summary Detailed Breakdown Chicken Coop Summary Recommended Coop Size: — Number of Chickens— Recommended Indoor Area— Recommended Run Area— Total Footprint— Suggested Coop Dimensions— Nesting Boxes Needed— Roost Length Needed— Coop Cost— Run Cost— Accessories / Additional— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Chicken Coop Size Calculator: Space, Dimensions and Cost Chicken coops get built too small more often than too big. Six standard hens need at least 24 square feet inside the coop and 60 square feet in the run before any adjustments. This calculator works out those figures from your actual flock, then adds multipliers for breed size and how much time the birds spend confined. Enter the number of chickens, pick the breed class, and set how long they’re inside. The tool returns recommended indoor area, run area, total footprint, suggested dimensions, nesting box count, and roost length. Enter prices per square foot and it adds the cost.   How to Use the Chicken Coop Size Calculator Pick your currency from the top dropdown. Enter the number of chickens in your flock. Choose a breed class: standard, large, or bantam. Set how much time they spend in the coop: full time, part time, or night only. Confirm the indoor space per chicken. Four square feet is the standard starting point. Set the run space per chicken. Ten square feet is the residential default. Pick nesting boxes as auto or enter your own count. Add coop dimensions if you have a specific footprint in mind, then enter prices. The Summary tab leads with recommended indoor and run areas. Detailed Breakdown lists every multiplier and adjustment.   How the Chicken Coop Size Calculator Formula Works The calculation starts with a base space allowance per bird, then adjusts it for breed size and confinement time. Formula: Indoor space per chicken = Base × Breed multiplier × Time multiplierFormula: Run space per chicken = Base × Breed multiplier × (Night only ? 0.7 : 1.0)Formula: Total indoor area = Chickens × Indoor space per chickenFormula: Total run area = Chickens × Run space per chickenFormula: Nesting boxes (auto) = [ Chickens ÷ 4 ]Formula: Roost length = Chickens × 9 inches Breed multipliers are 1.0 for standard, 1.3 for large or heavy breeds, and 0.6 for bantams. Time multipliers are 1.2 for full confinement, 1.0 for partial free range, and 0.8 for night only. A flock of six large breed chickens confined full time needs 6 × 4 × 1.3 × 1.2 = 37.4 ft² indoors. The run gets a slightly different treatment. Night-only birds get a 0.7 multiplier instead of 0.8, since they only use the run during daytime and can spread out more. Nesting boxes default to one per four hens, rounded up, with a minimum of one. Roost length uses 9 inches per bird, a standard figure that gives each hen room to settle without crowding. If you enter preferred coop dimensions, the tool uses those instead of suggesting a footprint. The 1.5-to-1 aspect ratio used for auto-suggested dimensions is a common backyard shape, long enough to fit a roost and wide enough to walk in.   Worked Example: Eight Standard Hens, Part-Time Free Range Say you’re planning a coop for eight standard chickens that get out to free range for a few hours a day. Base indoor space is 4 ft², base run space is 10 ft². The tool returns: Indoor space per chicken: 4 × 1.0 × 1.0 = 4.00 ft² Run space per chicken: 10 × 1.0 × 1.0 = 10.00 ft² Total indoor area: 8 × 4 = 32.00 ft² Total run area: 8 × 10 = 80.00 ft² Total footprint: 112.00 ft² Suggested dimensions: about 6.9 × 4.6 ft (indoor) Nesting boxes: ceil(8 ÷ 4) = 2 boxes Roost length: 8 × 9 = 72 inches, or 6.00 ft Coop cost at $25/ft²: $800.00 Run cost at $8/ft²: $640.00 Estimated total: $1,440.00 That’s the layout. The coop itself is modest. The run is where most of the footprint lives. Budget-wise, the run tends to be cheaper per square foot, but it adds up fast because the area is larger. Frequently Asked Questions How big should a chicken coop be? Four square feet per standard chicken inside the coop, plus ten square feet per bird in the run. A flock of six standard hens needs at least 24 ft² indoors and 60 ft² outside.   How much space per chicken in a coop? Four square

Work out how much carpet and underlay a room needs. Enter the dimensions, roll width, pattern match and waste, then get area, linear length and total cost. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Room Dimensions Room Length ftinmcmmmyd Room Width ftinmcmmmyd Number of Rooms roomsareas Carpet & Roll Details Carpet Roll Width ftinmcmmmyd Carpet Pattern Match No Pattern (Plain)Small Pattern MatchLarge Pattern Match Waste Factor % Underlay / Padding Underlay Type No UnderlayStandard FoamPremium PU FoamRubber CrumbFelt / Wool Price per Unit Area (Underlay) $ per ft²per yd²per m² Carpet Cost Details Carpet Price per Unit Area $ per yd²per ft²per m² Grip Rod / Accessories $ total Installation Labor $ totalper yd²per ft²per m² Summary Detailed Breakdown Carpet Summary Total Cost: — Room Area (per room)— Total Room Area— Carpet Area (with waste)— Linear Length Needed— Rolls / Cuts Needed— Underlay Area Needed— Carpet Cost— Underlay Cost— Accessories Cost— Labor Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Carpet Calculator: Estimate Carpet, Underlay and Cost This carpet calculator works out how much carpet and underlay a room needs. Enter the dimensions, roll width, pattern match, and waste factor. It returns carpet area, linear length, roll widths, underlay area, and a full cost estimate. Useful for bedrooms, stairs, and whole-floor projects. Carpet is sold by the square yard in the US and by the square meter almost everywhere else. It also comes on rolls of fixed width, which means the linear length you need isn’t the same as the room area divided by the roll width. A 15 ft × 12 ft room needs 180 ft² of carpet, but the roll width and the direction of the seams decide how many linear feet you actually buy. Get that wrong and you either run short or pay for a lot of waste. This tool handles the roll math. It checks both orientations for each room, picks the one that uses less material, and reports the linear length with waste included. Patterned carpet gets extra waste added automatically. Underlay is calculated with a small buffer. Then everything gets priced out. For a bedroom, a rental unit, or a whole house, the number you need is the total cost and the linear length to order.   How to Use the Carpet Calculator Pick your currency from the top dropdown. Enter the room length and width, then set the unit for each. Set how many rooms or areas you’re carpeting. Type the carpet roll width. Twelve feet is the common residential width. Choose a pattern match: none, small, or large. Adjust the base waste factor. Ten percent is the default. Select an underlay type, then enter its price per square foot, yard, or meter. Add the carpet price, any accessories cost, and labor if you have it. The Summary tab shows total cost, carpet area, linear length, and underlay area. Detailed Breakdown lists every value behind the result.   How the Carpet Calculator Formula Works The math runs in three stages: room area, carpet area with waste, and cost. Roll width and pattern match change the waste and the linear length. Formula: Area per room = Length × WidthFormula: Total area = Area per room × Number of roomsFormula: Carpet area = Total area × (1 + (Base waste + Pattern waste) ÷ 100)Formula: Underlay area = Total area × 1.05Formula: Linear length = Sum of the shorter room dimension in each orientation, then × (1 + total waste ÷ 100) Pattern waste is added to the base waste. Small pattern match adds 5 percent. Large pattern match adds 15 percent. A 10 percent base waste with a large pattern becomes 25 percent total. Linear length is the part most people get wrong. For each room, the tool compares two ways to lay the roll. Option one runs the roll along the room length and counts how many roll widths are needed across the width. Option two runs the roll along the room width and counts roll widths across the length. It picks the option that needs fewer roll widths, then adds the corresponding room dimension to the linear length. After all rooms are added, the total waste percentage is applied to the linear length too. Prices convert to per square foot before multiplying. Per square yard divides by 9. Per square meter divides by 10.7639. Labor can be a flat total or a rate per square yard, per square foot, or per square meter. When it’s a rate, it multiplies the carpet area with waste, not the bare room area.   Worked Example: Two 16 ft × 13 ft Bedrooms, 12 ft Roll Say you’re carpeting two bedrooms, each 16 ft long and 13 ft wide. Roll width is 12 ft. Carpet has a large pattern match. Base waste is 8 percent. Underlay is premium PU foam at $0.60 per ft². Carpet is $4.25 per yd². Accessories are $75. Labor is $2.50 per yd². Area per room: 16 × 13 = 208.00 ft² Total area: 208 × 2 = 416.00 ft² Pattern waste (large): 15% Total waste: 8% + 15% = 23% Carpet area with waste: 416 × 1.23 = 511.68 ft² Carpet area in yd²: 511.68 ÷

Find the boiler size a home needs in kW. Enter dimensions, insulation, bathrooms and climate, then get the required output, BTU/hr and a recommended unit. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Property Dimensions Property Length ftinmcmmmyd Property Width ftinmcmmmyd Wall Height ftinmcmmm Insulation & Building Details Insulation Level Excellent (Modern, A-rated)Good (Well insulated)Average (Standard)Poor (Old / Uninsulated)Very Poor (Pre-1930) Glazing Type Triple GlazedDouble GlazedSingle Glazed Number of Windows windows Number of External Doors doors Number of Occupants people Number of Bathrooms bathrooms Climate & System Details Climate Zone Mild (Warm Winters)ModerateCold (Harsh Winters)Severe (Extreme Cold) Boiler Type Combi BoilerSystem BoilerRegular / Conventional Safety Margin % Cost Details Price per kW (installed) $ per kW Additional Cost (installation, etc.) $ total Summary Detailed Breakdown Boiler Size Summary Required Boiler Size: — Total Floor Area— Total Volume— Base Heat Loss— Adjusted Heat Loss— Domestic Hot Water (DHW)— Total Heat Demand— Required in kW— Required in BTU/hr— Recommended Boiler Size— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Boiler Size Calculator: Find the Right kW Rating Boiler sizing comes down to two loads. One is the heat a house loses through walls, roof, windows and doors. The other is hot water demand from taps and showers. A combi handles both from the same box, which means the domestic hot water figure usually sets the floor. A system or regular boiler splits them across a cylinder and a heating circuit. This boiler size calculator works through both. Enter the property’s dimensions, the insulation and glazing, the number of bathrooms, and the climate zone, and it returns the required kW output, the BTU equivalent, and a recommended size from standard boiler ratings. Combi, system, and regular layouts each get their own DHW treatment. If you’re replacing an old unit or sizing one for a renovation, the number you need is the required kW, not the figure on the old boiler’s badge. Old boilers were often oversized on purpose.   How to Use the Boiler Size Calculator Pick your currency from the top dropdown. Enter the property length, width, and wall height, then set the unit for each. Pick the insulation level that matches the building. Old uninsulated homes need the lowest setting. Set the glazing type: triple, double, or single. Count the windows and external doors. Add the number of occupants and bathrooms. Choose the climate zone and boiler type. Combi, system, and regular each carry a different hot water load. Set the safety margin, then enter your price per kW and any additional cost. The Summary tab leads with required output in kW. Detailed Breakdown lists every multiplier and adjustment behind the result.   How the Boiler Size Calculator Formula Works The calculation stacks heating load and hot water load, then applies a safety margin. The final number snaps to a standard boiler rating. Formula: Base heat loss = Floor area (m²) × 60 W/m²Formula: Adjusted heat loss = (Base × Insulation × Glazing × Climate) + (Windows × 150 W) + (Doors × 200 W)Formula: DHW load = 24 kW + 3 kW per extra bathroom (combi), or 3 kW per bathroom (system / regular)Formula: Required output = (Heating kW + DHW kW) × (1 + Safety %)Formula: BTU/hr = Required output in kW × 3,412.14 The 60 W/m² figure is a standard UK rule for average insulation. It converts to roughly 5.6 W/ft². The multiplier stack then shifts that base up or down. Excellent insulation drops it to 70 percent. Very poor insulation lifts it to 160 percent. Glazing adds another 0.9× to 1.15×. Climate swings wider, from 0.85× in mild zones to 1.4× in severe cold. Each window adds a flat 150 W. Each external door adds 200 W. Those adders capture air leakage and conduction paths that don’t scale with wall area alone. The DHW load is where most people get surprised. A combi heats water instantly, so it needs a minimum output near 24 kW just to serve one shower at a normal flow rate. Each extra bathroom pushes that up by 3 kW. A system or regular boiler stores hot water in a cylinder, so its DHW load is only 3 kW per bathroom. After the totals, the safety margin inflates the result. The calculator defaults to 15 percent. Ten percent is often enough for residential work. The recommended size snaps to standard kW ratings: 12, 15, 18, 21, 24, 26, 28, 30, 32, 35, 38, 40, 45, 50, or 60. Above 60 kW, it rounds up to the nearest multiple of 5.   Worked Example: A 28 ft × 22 ft Three-Bedroom House Say you’re sizing a combi boiler for a small three-bedroom house. The footprint is 28 ft × 22 ft, ceilings are 8 ft. Insulation is excellent after a recent renovation. Triple glazing. Eight windows, one external door, three occupants, one bathroom. Climate zone is mild. Safety margin is 10%. Installed price is $180 per kW. Floor area: 28 × 22 = 616 ft² (57.23 m²) Total volume: 616 × 8 = 4,928 ft³ Base heat loss: 57.23 × 60 = 3,434 W Insulation (excellent): × 0.7 Glazing (triple): × 0.9 Climate (mild): × 0.85 Adjusted base: 3,434 × 0.7 ×

Work out the volume, arc length and radius of a semicircular, segmental, gothic, elliptical or flat arch. Enter span, rise and depth for a cost estimate. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Arch Dimensions Arch Span (Width) ftinmcmmmyd Arch Rise (Height) ftinmcmmm Arch Depth / Thickness ftinmcmmm Number of Arches arches Waste Factor % Arch Type & Material Arch Type Semicircular (Half Round)Segmental ArchGothic (Pointed) ArchElliptical ArchFlat Arch Material Type ConcreteBrick MasonryStone MasonryWood / TimberSteel Cost Details Price per Unit Volume $ per yd³per ft³per m³ Additional Cost (formwork, labor) $ total Summary Detailed Breakdown Arch Summary Total Volume: — Arch Type— Material— Arch Span— Arch Rise— Arc Length— Radius of Curvature— Central Angle— Face Area— Volume per Arch— Total Volume (base)— Total Volume with Waste— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Arch Calculator: Volume, Arc Length and Material Cost An arch is a curve with volume behind it. The face looks simple until you need a number for the radius, the arc length, or the cubic yards of masonry to fill it. This arch calculator handles five arch types, from a half-round semicircle to a flat arch, and returns the arc length, radius of curvature, central angle, face area, and total volume. Enter the span, rise, and depth, and the summary updates as you type. Five arch types are covered. Five material types are tracked for record-keeping. Prices accept per cubic yard, per cubic foot, or per cubic meter, which covers most supplier quotes. It runs in the browser, so dimensions and prices stay on your device.   How to Use the Arch Calculator Pick your currency from the top dropdown. Enter the arch span, which is the total width across the opening. Add the rise, the height of the arch above its spring line. Set the depth or thickness of the arch ring. Type how many identical arches you’re building. Pick an arch type: semicircular, segmental, gothic, elliptical, or flat. Select the material for the record, then adjust the waste factor. Enter your price per unit volume and any additional cost. The Summary tab leads with total volume in cubic yards and cubic meters. Detailed Breakdown lists every value the math passes through.   How the Arch Calculator Formula Works Each arch type uses a different geometry, but they all end the same way: face area times depth equals volume. Formula: Semicircular radius = Span ÷ 2Formula: Segmental radius = (Rise ÷ 2) + (Span² ÷ (8 × Rise))Formula: Gothic radius = SpanFormula: Flat area = Span × RiseFormula: Total volume = Face area × Depth × Count × (1 + Waste %) The semicircle is the simplest case. Its radius is half the span, the central angle is 180 degrees, and the face area is a half-circle. Everything is exact. The segmental arch is the one most builders actually want. Given a span and a rise, the formula solves for the radius that produces that curve. A shallow segmental arch over a wide doorway is the classic use case. The math behind it uses the chord and sagitta relationship, which is why the radius calculation looks different from the others. The gothic arch uses a fixed geometry. The radius equals the span and each side sweeps through 60 degrees, creating the pointed peak. That’s the standard equilateral gothic profile. Real gothic arches vary, but this is the common construction shape. The elliptical arch approximates the perimeter using Ramanujan’s formula, which is accurate to within a fraction of a percent for most ellipse shapes. Face area is π × half-span × rise, divided by two for the half-ellipse. The flat arch is a rectangle with a level soffit. It’s not really curved at all, but it’s included because flat arches over doors and windows are common in masonry. Material type affects display only. It doesn’t change the volume math. The material matters when you’re pricing, and the calculator lets you do that with the price per unit volume field.   Worked Example: A 12 ft Segmental Arch, 3 ft Rise, 1.5 ft Deep Say you’re building a segmental arch over a 12 ft doorway. The rise is 3 ft. The arch ring is 1.5 ft thick. Waste factor is 10%. Concrete at $150 per cubic yard. Span: 12 ft Rise: 3 ft Half span: 6 ft Radius: (3 ÷ 2) + (12² ÷ (8 × 3)) = 1.5 + 6 = 7.5 ft Half angle: asin(6 ÷ 7.5) = asin(0.8) = 0.9273 rad Central angle: 2 × 0.9273 = 1.8546 rad, or 106.26° Arc length: 7.5 × 1.8546 = 13.91 ft Face area: (7.5² ÷ 2) × (1.8546 − sin(1.8546)) = 28.125 × 0.8948 = 25.17 ft² Volume per arch: 25.17 × 1.5 = 37.76 ft³ With 10% waste: 41.53 ft³, or 1.538 yd³ Cost at $150/yd³: 1.538 × 150 = $230.70 Just over a yard and a half of concrete, and the arc length comes in at nearly 14 ft. The contractor who cuts the formwork needs that arc length number more than the volume number. It tells them how long a piece of plywood to bend. Benefits of Using This Arch Calculator Five arch types are covered, so you’re not

Work out the BTU an air conditioner needs for a room. Enter the dimensions, sun exposure, insulation and occupants, then get BTU and a standard AC size. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Room Dimensions Room Length ftinmcmmmyd Room Width ftinmcmmmyd Ceiling Height ftinmcmmm Room Conditions Number of Occupants people Sun Exposure Low (Shaded / North-Facing)Medium (Partial Sun)High (Full Sun / West-Facing)Very High (Top Floor / No Shade) Insulation Quality Excellent (New Construction)Good (Well Insulated)Average (Standard)Poor (Old / Uninsulated) Number of Windows windows Appliances / Heat Sources None / MinimalLight (TV, computer)Medium (Multiple electronics, refrigerator)Heavy (Kitchen, server room) Safety Margin % Cost Details Price per 1,000 BTU $ per 1,000 BTU Installation / Additional Cost $ total Summary Detailed Breakdown BTU Requirement Summary Required BTU: — Room Area— Room Volume— Base BTU Load— Adjusted BTU Load— Total BTU Required— Recommended AC Size— Recommended BTU— Estimated Equipment Cost— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT BTU Calculator: Find the Cooling BTU Your Room Needs BTU is the working unit of air conditioning. Tons are just a shorthand for 12,000 BTU. This BTU calculator works in the base unit from start to finish, so you see the exact cooling load before it gets rounded to the nearest ton size. Enter the room dimensions, set the conditions, and the tool returns base BTU, adjusted BTU, total BTU with safety, and the closest standard AC size in BTU. Everything that affects cooling load is accounted for. Sun exposure multiplies the base figure up or down. Insulation does the same. Every window over two adds about a thousand BTU. Heavy appliances push it further. The result is a number you can hand to a supplier without converting units.   How to Use the BTU Calculator Pick your currency from the top dropdown. Enter the room length, width, and ceiling height. Set the unit for each dimension: ft, in, m, cm, mm, or yd. Type how many people use the room regularly. Pick a sun exposure from shaded to very high. Choose insulation quality, from new construction to uninsulated. Add window count and appliance load. Set the safety margin, then enter price per 1,000 BTU and any additional cost. The Summary tab shows total BTU and recommended equipment size. Detailed Breakdown lists every multiplier and add-on.   How the BTU Calculator Formula Works Base cooling load is 20 BTU per square foot per hour. The rest of the inputs adjust that number up or down. Formula: Base BTU = Room area (ft²) × 20Formula: Adjusted BTU = Base BTU × Sun multiplier × Insulation multiplierFormula: Total BTU = (Adjusted BTU + Occupants + Windows + Appliances) × (1 + Safety %)Formula: Recommended size = Smallest standard BTU rating that meets total BTU Sun exposure ranges from 0.9 for shaded rooms to 1.25 for a top-floor room with no shade. Insulation ranges from 0.85 for new construction to 1.35 for older uninsulated spaces. Those two multipliers stack, so a sunny poorly insulated room can land at roughly 1.69× the base BTU before any occupants, windows, or appliances are counted. The add-ons are fixed. Each occupant beyond two adds 400 BTU. Every window adds 1,000 BTU. Appliances range from zero to 4,000 BTU depending on the load. Those are industry rules of thumb, not measurements of a specific room. Once total BTU is calculated, the tool snaps to the nearest standard size: 5,000, 6,000, 8,000, 10,000, 12,000, 15,000, 18,000, 21,000, 24,000, 30,000, 36,000, 42,000, 48,000, or 60,000 BTU. If your load exceeds 60,000 BTU, the tool rounds up to the nearest 6,000 BTU. One ton of cooling equals 12,000 BTU per hour, so the recommended size in tons is just total BTU divided by 12,000. The tool shows both.   Worked Example: A 12 ft × 14 ft Home Office Say you’re sizing a unit for a 12 ft × 14 ft home office with 9 ft ceilings. Two people work in it. High sun exposure. Average insulation. Two windows. Medium appliance load (a desktop, a monitor, a mini-fridge). Safety margin is 10%. Room area: 12 × 14 = 168 ft² Room volume: 168 × 9 = 1,512 ft³ Base BTU: 168 × 20 = 3,360 BTU/hr Sun multiplier (high): 1.15 Insulation multiplier (average): 1.15 Adjusted base: 3,360 × 1.15 × 1.15 = 4,443.6 BTU/hr Occupants beyond 2: 0 → 0 BTU Windows: 2 × 1,000 = 2,000 BTU Appliances (medium): 2,000 BTU Subtotal: 4,443.6 + 0 + 2,000 + 2,000 = 8,443.6 BTU/hr With 10% safety: 8,443.6 × 1.10 = 9,288 BTU/hr Recommended size: 10,000 BTU (smallest standard above 9,288) A 10,000 BTU unit covers the office with a bit of headroom. That’s a large window unit or a small mini-split. The same room with low sun and excellent insulation would drop to around 7,000 BTU, which is a smaller window unit. Frequently Asked Questions How many BTU do I need per square foot? Twenty BTU per square foot is the standard rule for well-insulated rooms. High sun exposure or poor insulation pushes toward 25 or 30. Shaded, sealed rooms can drop to 18 or below.   How do I convert BTU to tons? Divide BTU by 12,000. A 24,000 BTU unit

Work out the air changes per hour in any room. Enter dimensions and airflow, pick a room type, and see ACH, exchange time and compliance status. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Room Dimensions Room Length ftinmcmmmyd Room Width ftinmcmmmyd Ceiling Height ftinmcmmm Airflow Details Airflow Rate CFMm³/hL/sm³/sACH (target) Room Type Custom / GeneralBedroom (2-4 ACH)Bathroom (6-10 ACH)Kitchen (10-15 ACH)Living Room (2-4 ACH)Office (4-6 ACH)Classroom (4-6 ACH)Hospital Room (6-12 ACH)Laboratory (8-15 ACH)Server Room (20-30 ACH)Garage (6-10 ACH) Efficiency Loss % Cost Details Price per Unit Airflow $ per CFMper m³/hper L/s Additional Cost (installation, etc.) $ total Summary Detailed Breakdown ACH Summary Air Changes: — Room Area— Room Volume— Airflow Rate (input)— Airflow Rate (CFM)— Airflow Rate (m³/h)— Air Changes per Hour— Air Changes per Minute— Time for Full Air Exchange— Recommended ACH Range— Compliance Status— Estimated Total Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT Air Changes Per Hour Calculator: ACH, CFM and Compliance Air changes per hour tells you how many times the full volume of a room gets replaced with fresh air in sixty minutes. This ACH calculator takes your room dimensions, the airflow your fan or HVAC system moves, and the room type, then returns the ACH, the time for one complete air exchange, and a compliance check against the range that room should hit. Enter the numbers in feet or meters, in CFM or m³/h, and the summary updates live. Bathrooms want 6 to 10 ACH. Kitchens want 10 to 15. A server room pushes 20 to 30. Those aren’t preferences; they’re the thresholds that keep humidity, odors, and heat under control. The calculator matches your result against the recommended range for the room type you pick, then flags it above or below. Useful for HVAC design, bathroom fan sizing, and any space where the air has to move on a schedule.   How to Use the ACH Calculator Pick your currency from the top dropdown. Enter the room length, width, and ceiling height, then set the units. Type the airflow rate your fan, blower, or HVAC system produces. Pick the airflow unit: CFM, m³/h, L/s, m³/s, or a target ACH. Select the room type from the dropdown to load its recommended range. Set the efficiency loss. Ten percent covers typical ductwork and fan losses. Add your price per unit airflow and any additional cost. Review the Summary tab for ACH and compliance, or switch to Detailed Breakdown for the full math.   How the ACH Calculator Formula Works Air changes per hour divides the total volume of air moved in an hour by the volume of the room. Formula: Effective airflow = Airflow × (1 − Efficiency loss %)Formula: ACH = (Effective airflow in CFM × 60) ÷ Room volume in ft³Formula: Time per exchange = 60 ÷ ACH (minutes) If you enter airflow in CFM, the tool multiplies by 60 to get cubic feet per hour, then divides by room volume. If you enter m³/h, L/s, or m³/s, it converts those to CFM first. An ACH target entry works the other way: the tool reverses the formula to find the CFM needed to hit that many air changes. The efficiency loss accounts for real-world duct leakage, fan degradation, and filter loading. Ten percent is the default and fits most residential ductwork. Tighter commercial systems run 5 percent. Old or poorly sealed systems can lose 20 percent or more. The tool applies the loss before calculating ACH, so the result reflects what the room actually gets, not what the fan nameplate claims. Room type sets the expected range. A bedroom should sit between 2 and 4 ACH. An office or classroom wants 4 to 6. A hospital room sits at 6 to 12 because infection control matters. Labs push 8 to 15, server rooms 20 to 30. If your room type is Custom, the tool skips the compliance check since there’s no universal target.   Worked Example: A 12 ft × 9 ft Bathroom With a 110 CFM Fan Say you’re checking whether a bathroom exhaust fan is big enough. The room is 12 ft long, 9 ft wide, and 8 ft tall. The fan is rated at 110 CFM. Duct losses are 10 percent. Room area: 12 × 9 = 108 ft² Room volume: 108 × 8 = 864 ft³ Effective airflow: 110 × 0.90 = 99 CFM ACH: (99 × 60) ÷ 864 = 6.88 ACH Air changes per minute: 6.88 ÷ 60 = 0.115 ACM Time for full exchange: 60 ÷ 6.88 = 8.72 minutes The bathroom lands at 6.88 ACH, inside the recommended 6 to 10 range. The fan clears the room in about 8 and a half minutes, which is the number most people actually want to know. Below 6 ACH, condensation lingers on the mirror and mold gets a foothold. Above 10, the fan is louder than it needs to be and pulls conditioned air out faster than necessary. Frequently Asked Questions How do you calculate air changes per hour? Multiply airflow in CFM by 60, then divide by room volume in cubic feet. A 100 CFM fan in a 1,000 ft³ room gives 6 ACH. The tool does this automatically and reports the result alongside

Work out what size AC a room needs. Enter the dimensions, occupants, sun exposure and insulation, then get the BTU load and recommended tonnage. Select Currency $ – US Dollar€ – Euro£ – British PoundC$ – Canadian DollarA$ – Australian Dollar¥ – Japanese Yen₹ – Indian Rupee₨ – Pakistani Rupeeد.إ – UAE Dirham﷼ – Saudi RiyalS$ – Singapore DollarRM – Malaysian Ringgit₱ – Philippine Peso₩ – South Korean WonCHF – Swiss FrancNZ$ – New Zealand Dollar Room Dimensions Room Length ftinmcmmmyd Room Width ftinmcmmmyd Ceiling Height ftinmcmmm Room Conditions Number of Occupants people Sun Exposure Low (Shaded / North-Facing)Medium (Partial Sun)High (Full Sun / West-Facing)Very High (Top Floor / No Shade) Insulation Quality Excellent (New Construction)Good (Well Insulated)Average (Standard)Poor (Old / Uninsulated) Number of Windows windows Appliances / Heat Sources None / MinimalLight (TV, computer)Medium (Multiple electronics, refrigerator)Heavy (Kitchen, server room) Safety Margin % Cost Details Price per Ton (installed) $ per ton Installation / Additional Cost $ total Summary Detailed Breakdown AC Tonnage Summary Required Capacity: — Room Area— Room Volume— Base BTU Load— Total BTU Load— Required Tonnage (exact)— Recommended AC Size— Recommended BTU— Estimated Cost— Component Value Unit Enter details and calculate to see breakdown. Powered by Techraxy Calculate Reset Copy Share ADVERTISEMENT Relevant Tools Creator & Reviewer Founder & CEO, Techraxy Faiq Ur Rahman is a web designer, digital product developer, and Founder of Techraxy, a growing platform of online calculators and utility tools. He specializes in building structured, user-friendly tools focused on finance, health, conversions, productivity, and everyday problem-solving. He is passionate about developing practical digital solutions that make complex tasks simpler for users worldwide. View Profile Share: Rate this Tool User Ratings: ADVERTISEMENT ADVERTISEMENT AC Tonnage Calculator: Find the Right Air Conditioner Size An undersized AC runs nonstop and never quite cools the room. An oversized one short-cycles, leaves humidity behind, and costs more to install. This AC tonnage calculator works out the cooling load from the room’s dimensions and conditions, then recommends the closest standard tonnage above the result. Enter length, width, and ceiling height, note the sun exposure and insulation, and the tool returns BTU per hour and a ton size you can actually buy. Every input shifts the load. A west-facing window adds BTU. A poorly insulated wall adds more. The occupants themselves count. Two people barely register. Five people push the total up by 1,200 BTU before you’ve added anything else. Getting the number right means the unit runs efficiently instead of fighting the room.   How to Use the AC Tonnage Calculator Pick your currency from the top dropdown. Enter the room length, width, and ceiling height, then set the unit for each. Type how many people regularly use the room. Choose the sun exposure: shaded, partial, full, or very high. Pick the insulation quality, from new construction to uninsulated. Add the number of windows in the room. Set the appliance load: none, light, medium, or heavy. Adjust the safety margin, then enter your installed price per ton. The Summary tab shows total BTU and recommended tonnage. Detailed Breakdown lists every multiplier and adjustment behind the result.   How the AC Tonnage Calculator Formula Works The calculation starts with square footage and applies multipliers for the room’s real-world conditions. Base cooling load is 20 BTU per square foot per hour, then it climbs or drops based on the rest of the inputs. Formula: Base BTU = Room area (ft²) × 20Formula: Adjusted BTU = Base BTU × Sun multiplier × Insulation multiplierFormula: Total BTU = (Adjusted BTU + Occupants + Windows + Appliances) × (1 + Safety %)Formula: Required tons = Total BTU ÷ 12,000 Sun and insulation are multipliers, so they compound. A very-high-sun room with poor insulation multiplies the base load by 1.25 × 1.35, which is roughly a 69 percent increase before any other input counts. The add-on loads are fixed. Each occupant beyond the first two adds 400 BTU. Every window adds 1,000 BTU. Appliances range from zero for a sparse room up to 4,000 BTU for a kitchen or server closet. Those are industry rules of thumb, not exact measurements. One ton of cooling equals 12,000 BTU per hour. That’s the standard unit used in North America, and it comes from the old ice-melting equivalent, not from the weight of the machine. The tool then rounds the required tonnage up to the nearest standard residential size: 0.75, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7.5, 8, 10, 12.5, 15, or 20 tons.   Worked Example: A 15 ft × 12 ft Bedroom Say you’re sizing an AC for a 15 ft × 12 ft bedroom with 9 ft ceilings. Two occupants. Partial sun exposure. Well-insulated. Two windows. No heavy appliances. Safety margin is 10%. Room area: 15 × 12 = 180 ft² Room volume: 180 × 9 = 1,620 ft³ Base BTU: 180 × 20 = 3,600 BTU/hr Sun multiplier (partial): 1.00 Insulation multiplier (good): 1.00 Adjusted base: 3,600 × 1.00 × 1.00 = 3,600 BTU/hr Occupants beyond 2: 0 → 0 BTU Windows: 2 × 1,000 = 2,000 BTU Appliances: none → 0 BTU Subtotal: 3,600 + 0 + 2,000 + 0 = 5,600 BTU/hr With 10% safety: 5,600 × 1.10 = 6,160 BTU/hr Required tons: 6,160 ÷ 12,000 = 0.513 tons Recommended size: 0.75 ton (smallest standard) A bedroom at that size needs just over half a ton. Since nothing smaller than 0.75 ton is standard, the tool recommends the 0.75 ton unit. That’s a window or mini-split unit, not a central air system. Frequently Asked Questions What size AC do I need for my room? Multiply the area by 20 BTU, then adjust for sun, insulation, occupants, and windows. A 200 ft² bedroom with average conditions needs around 6,000 BTU, or 0.5 tons. Round up to the next standard size.   How many BTU per square foot for AC? Twenty BTU per square foot is the standard rule of thumb for well-insulated rooms. Rooms with poor insulation or