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?
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.
What should you read before you order materials?
Field notes from real jobs that explain the numbers behind this calculator.