Fence Post Spacing Calculator

Fence post spacing calculator — see how many posts you need at every spacing for your fence length. Use the free Fence Post Spacing Calculator below — enter your values and get instant results, right in your browser. Posts needed = fence length (ft) ÷ post spacing (ft) + 1. The table steps spacing by 2 feet per row: 2, 4, 6 … up to 2 × rows.

How to use the Fence Post Spacing Calculator

Closer posts make a stronger fence but cost more; wider spacing saves money but lets wire sag. Instead of calculating one spacing at a time, this fence post spacing calculator builds a full comparison table for your fence length — from tight 2-foot spacing out to 20 feet and beyond. Scan the table, balance strength against budget, and pick the spacing that suits your animals and your pocket. Every row uses the same simple rule: posts = fence length ÷ spacing + 1.

  1. Enter your total fence length in feet in the input box.
  2. Set how many table rows you want (each row is a wider spacing).
  3. Click Generate to build the spacing comparison table.
  4. Read across each row to compare post counts at different spacings.
  5. Pick your spacing and buy that many posts plus a few spares.

Formula

Posts needed = fence length (ft) ÷ post spacing (ft) + 1. The table steps spacing by 2 feet per row: 2, 4, 6 … up to 2 × rows.

Worked example

For a 500 ft fence: at 8 ft spacing you need 63.5 → 64 posts; at 10 ft spacing 51 posts; at 12 ft spacing about 43 posts. Widening from 8 to 12 ft spacing saves roughly 21 posts. Buy a few extra posts for corners and gate sides, which always need doubling up for strength.

Frequently asked questions

At 10-foot spacing, 51 posts. Use the table to compare other spacings for the same length.

A fence run needs a post at both ends, so the count is always one more than the number of gaps.

Yes — the +1 covers end posts on a straight run. For corners and gates, add one extra post per corner and gate side.

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