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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.
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.
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 areas
Formula: Effective coverage = Coverage rate ÷ Thickness in mils
Formula: Gallons per coat = Total area ÷ Effective coverage
Formula: 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.
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.
Thickness drives the volume more than area. Doubling thickness doubles the epoxy. A thin seal coat at 3 mils uses far less than a high-build floor at 20 mils. Check the product data sheet for the target thickness.
Epoxy mix ratio is the ratio of resin to hardener by volume. Common ratios are 1:1, 2:1, 3:1, 4:1, 5:1, and 10:1. The ratio is set by the manufacturer. Do not guess it.
| Mix Ratio | Part A | Part B | Typical Use |
|---|---|---|---|
| 1:1 | 50% | 50% | Tabletop, casting |
| 2:1 | 67% | 33% | Standard coating |
| 3:1 | 75% | 25% | Floor coating |
| 4:1 | 80% | 20% | Industrial coating |
| 5:1 | 83% | 17% | High-build coating |
| 10:1 | 91% | 9% | Specialty systems |
Mixing by volume is standard for most kits. Some products specify by weight. Follow the label. Wrong ratios leave sticky spots or a soft cure.
Coverage rate is the area one gallon covers at a given thickness. It’s usually listed as square feet per gallon at 1 mil. A 1,600 ft²/gal @ 1 mil product covers 160 ft² at 10 mils.
Coverage changes with substrate. Porous concrete absorbs more epoxy than sealed concrete. Rough surfaces need more material to fill the profile. Add waste for the first coat on bare concrete. Ten percent is a safe start.
Most floors need two coats. A primer coat followed by a topcoat is common. Castings and tabletops usually need one pour. Check the product instructions.
Two coats double the epoxy volume. That’s the biggest driver after thickness. If the calculator shows 3 gallons for one coat, two coats need 6 gallons before waste.
Add the ratio numbers to get the total parts. In a 2:1 mix, total parts are 3. Part A is 2/3 of the total volume. Part B is 1/3. Multiply total gallons by each fraction.
Formula: Part A = Total volume × (A ratio ÷ (A ratio + B ratio))
A 3.402-gallon batch at 2:1 splits into 2.268 gallons of Part A and 1.134 gallons of Part B. The tool does this automatically.
Thickness converts coverage rate into real-world spread. A product rated at 1,600 ft²/gal @ 1 mil covers 1,600 ft² at 1 mil. At 10 mils it covers 160 ft². At 20 mils it covers 80 ft².
That 1/x relationship means small thickness changes cause big volume changes. Going from 10 to 12 mils raises epoxy use by 20 percent. Always confirm the target thickness before ordering.
The biggest mistake is using the wrong coverage rate. The rate on the can is for a specific thickness. Second is forgetting waste. Third is mixing Part A and Part B by eye instead of measuring.
Fourth is ordering by area alone. A 200 ft² floor at 10 mils and a 200 ft² floor at 20 mils need very different amounts. Fifth is ignoring pot life. Mixed epoxy has a working time. Mix only what you can spread in that window.
Use a calculator when thickness, coverage, and mix ratio all matter. Manual math works for a simple 1:1 pour with a known coverage. Add a 3:1 ratio, two coats, and a metric thickness, and the chance of an error climbs fast.
This tool also handles unit conversions. Coverage in m²/L, thickness in mils, and area in square feet all normalize before the math runs.
Resin and hardener amounts are split from the same total, so you don’t mix two separate calculations.
Coverage rate and thickness work together. Change one and the volume updates.
Six mix ratios cover common 1:1 systems through 10:1 specialty products.
Kit count rounds to whole units, matching how epoxy is sold.
Metric and imperial units mix freely. Thickness in mils with area in square meters computes correctly.
Cost output separates epoxy, tools, and labor.
Sixteen currencies work for USD, EUR, GBP, and more.
All math runs in your browser. Project dimensions and prices stay private.
Multiply countertop area by thickness, then divide by coverage. A 25 ft² countertop at 1/8 inch thick needs about 1.3 gallons of mixed epoxy. Add 10 percent waste and round up to the next kit.
Mix ratio is set by the manufacturer. Common ratios are 1:1, 2:1, and 3:1. Do not guess. The ratio is by volume for most kits, but some products specify by weight.
A 400 ft² garage floor at 10 mils needs about 2.5 gallons with a 160 ft²/gal coverage rate. Two coats push that to 5 gallons. Add waste for bare concrete.
Most garage floors finish at 8 to 12 mils for a roll coat. High-build systems go 20 mils or more. Check the product data sheet for the target thickness.
Only if the manufacturer says so. Most kits are designed for volume mixing. Weight mixing requires a scale and a known density. When in doubt, mix by volume.
Most epoxies cure to touch in 8 to 12 hours. Full cure takes 3 to 7 days. Cold temperatures slow cure. Warm temperatures speed it up and shorten pot life.
Sticky epoxy usually means the mix ratio was off or the two parts weren’t mixed thoroughly. Scrape the sides and bottom of the bucket while mixing. Measure by volume, not by eye.
Ten percent is standard for coated surfaces. Bare or porous concrete can absorb more. Use 15 percent on a first coat over new concrete.
Yes. Coverage is inversely proportional to thickness. A product covering 1,600 ft²/gal at 1 mil covers 160 ft² at 10 mils and 80 ft² at 20 mils.
Pot life is the working time after Part A and Part B are mixed. It ranges from 10 minutes to over an hour depending on the product. Mix only what you can spread in that window.
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