Fence calculator
Posts, pickets, rails and concrete for a wood fence.
Inputs
The formula
Posts = ⌈length ÷ spacing⌉ + 1. Pickets = length × 12 ÷ (width + gap).
Worked example
100 ft, 8 ft spacing = 13 posts / 12 sections; 5.5" pickets + ¼" gap ≈ 209 pickets.
Frequently asked
›Standard post spacing?
6 or 8 ft. Closer spacing = stiffer fence.
›Concrete per post?
Two 50 lb fast-set bags per 8"×24" post hole is typical.