Introduction
Vinyl fence is sold by the panel, not by the linear foot. That’s the first thing that trips up a first-time buyer. A 100 ft run with 8 ft posts doesn’t cost 100 × per-foot price. It costs 13 panels plus 14 posts plus 26 rails plus 195 pickets plus concrete plus a gate. Getting the component counts right is the whole job before you ever touch a shovel.
Post spacing drives everything. Most vinyl systems use 8 ft on center, but 6 ft spacing adds posts, panels, and pickets. Post hole depth and diameter drive the concrete. A 30-inch deep, 9-inch hole takes 0.78 cubic feet per post with a standard post. That’s 1.3 bags of 80 lb mix per hole. Get any of those wrong and you either run short in the middle of setting posts or end up with a pallet of returns.
How to Use the Vinyl Fence Calculator
Pick your currency from the dropdown if you want the cost in something other than US dollars.
Enter the total fence length and pick the unit — feet, inches, yards, meters, centimeters, or millimeters.
Enter the fence height.
Enter the post spacing. Eight feet is standard for most vinyl systems.
Enter the panel width from your supplier’s spec. This value is recorded in the breakdown for reference.
Set the rails per section. Two rails is typical for a 4 to 6 ft fence; three for taller walls.
Enter the pickets per panel. Your supplier’s panel spec sheet lists this number.
Enter how many gates you need.
Set the post hole depth and diameter. Thirty inches deep and 9 inches wide is common.
Enter the cost per panel, per post, per gate, and per bag of concrete.
Set the waste factor. Five percent is standard for straight runs.
Add any extra cost for hardware, adhesive, or delivery, then hit Calculate.
How the Vinyl Fence Calculator Formula Works
Every dimension converts to feet before the counting math runs.
Formula: Number of Posts = ceil(Fence Length ÷ Post Spacing) + 1
Formula: Number of Panels = Number of Posts − 1
Formula: Total Rails = Panels × Rails per Section
Formula: Total Pickets = Panels × Pickets per Panel
Formula: Concrete per Post (ft³) = π × (Hole Diameter ÷ 2)² × Hole Depth
Formula: Total Concrete (ft³) = Concrete per Post × Number of Posts
Formula: Concrete Bags = ceil(Total Concrete with Waste ÷ 0.6)
Formula: Total Cost = Panel Cost + Post Cost + Gate Cost + Concrete Cost + Additional
The post count uses ceil and adds one. A 100 ft fence with 8 ft spacing gives ceil(12.5) + 1 = 14 posts. The extra one is the far-end post. Panels are always one fewer than posts because each panel sits between two posts. The tool enforces a two-post minimum to keep the output sane on tiny inputs.
The concrete math treats each post hole as a cylinder. A 9-inch diameter hole has a 4.5-inch radius, or 0.375 ft. Thirty inches of depth is 2.5 ft. π × 0.375² × 2.5 = 1.105 cubic feet per hole. Holes are usually dug wider than the post and about a third of the post length deep. The 80 lb bag yield of 0.6 ft³ is the standard figure on retail concrete mix packaging.
Waste applies to every countable item before cost. Posts, panels, rails, and pickets all get the waste multiplier, and the post count rounds up to the nearest whole number. Concrete gets the same treatment before the bag conversion. That’s why the numbers on the summary line are all whole units.
One quirk worth knowing: the panel width field is captured and recorded in the breakdown table, but it doesn’t drive the panel count. Panel count comes from posts minus one, which comes from post spacing. The panel width field exists for documentation, not calculation.
Worked Example
You’re fencing a 132 ft backyard. Six-foot-tall vinyl privacy fence. Posts on 8 ft centers. Panels have two rails and 15 pickets each. One gate. Post holes are 30 inches deep and 9 inches wide. Panels are $72 each, posts $28 each, the gate is $185, and an 80 lb bag of concrete runs $6.75. Waste factor is 5%. No additional cost.
Step 1: Number of posts.
ceil(132 ÷ 8) + 1 = ceil(16.5) + 1 = 17 + 1 = 18 posts.
Step 2: Number of panels.
18 − 1 = 17 panels.
Step 3: Rails.
17 × 2 = 34 rails.
Step 4: Pickets.
17 × 15 = 255 pickets.
Step 5: Fence area.
132 × 6 = 792 ft².
Step 6: Concrete per post.
π × 0.375² × 2.5 = 1.105 ft³.
Step 7: Total concrete.
1.105 × 18 = 19.89 ft³.
In cubic yards: 19.89 ÷ 27 = 0.737 yd³.
Step 8: Apply 5% waste to countable items.
Posts: ceil(18 × 1.05) = 19 posts.
Panels: ceil(17 × 1.05) = 18 panels.
Rails: ceil(34 × 1.05) = 36 rails.
Pickets: ceil(255 × 1.05) = 268 pickets.
Concrete: 19.89 × 1.05 = 20.88 ft³.
Step 9: Concrete bags.
ceil(20.88 ÷ 0.6) = ceil(34.8) = 35 bags.
Step 10: Material cost.
Panels: 18 × $72 = $1,296.00.
Posts: 19 × $28 = $532.00.
Gate: 1 × $185 = $185.00.
Concrete: 35 × $6.75 = $236.25.
Total: $2,249.25.
The Summary tab reads 132 ft length, 19 posts, 18 panels, 36 rails, 268 pickets, 0.737 yd³ of concrete (35 bags), 792 ft² of fence area, and $2,249.25 total. The breakdown tab lists every base count and every waste-adjusted count side by side.
Drop the post spacing to 6 ft and the same run jumps to 23 posts, 22 panels, and a material cost closer to $2,750. Tighter spacing costs more.
