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Construction Calculators

Fence Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
ft
ft
Verified formula Private

Posts needed

14

Fence sections
13

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Fence Calculator

The Fence Calculator works out your posts needed, along with 1 related figure in an instant. Enter fence length and post spacing and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the fence length.
  2. Enter the post spacing.
  3. Read off your posts needed, together with fence sections — the calculator updates automatically, with no button to press.

Worked example

For example, with fence length of 100 ft and post spacing of 8 ft, the posts needed is 14.

Inputs used
Fence length 100 ft
Post spacing 8 ft
Results
Posts needed 14
Fence sections 13

Results are estimates for educational use, not professional advice.

Frequently asked questions

Divide the fence length by the post spacing for the number of sections, then add one post for the final end. A 100 ft fence with 8 ft spacing needs 14 posts.

A straight fence needs a post at both ends, so the number of posts is always one more than the number of sections between them.

Six to eight feet is common for most fences. Closer spacing adds strength for tall or windy sites; check your panel width and local guidance.

For a fence that loops back to its start, the number of posts equals the number of sections, so subtract the extra end post.

Enter the fence length. Enter the post spacing. Read off your posts needed, together with fence sections — the calculator updates automatically, with no button to press.

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