Fence calculator
Posts, pickets, rails and concrete for a wood fence.
Short answer: Posts = ⌈length ÷ spacing⌉ + 1. Pickets = length × 12 ÷ (width + gap). 100 ft, 8 ft spacing = 13 posts / 12 sections; 5.5" pickets + ¼" gap ≈ 209 pickets. Enter your measurements above and the fence calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
Posts
14
13 sections
Pickets
209
Rails
26
28 bags concrete
How does the fence calculator work?
Posts = ⌈length ÷ spacing⌉ + 1. Pickets = length × 12 ÷ (width + gap).
What does a worked example look like?
100 ft, 8 ft spacing = 13 posts / 12 sections; 5.5" pickets + ¼" gap ≈ 209 pickets.
What do people ask most?
›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.
Which outdoor construction calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.