MicroCalculatorsFence Post Spacing Calculator
Calculate how many fence posts you need. Posts = floor(fence length ÷ spacing) + 1. Typical spacing is 6–8 ft for wood fences.
Total length of the fence line.
Distance between post centers. 6–8 ft typical.
Result:
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Fence Post Spacing Calculator — FAQ
- What spacing is best for wooden fences?
- 6–8 feet is typical. Treated lumber often allows 8 ft; check local codes.
- Do metal posts allow wider spacing?
- Yes. Metal posts can often be spaced 8–10 ft apart with appropriate rails.
- How deep should fence posts be set?
- 1/3 of post above ground should be underground — e.g. 6-ft post needs 2 ft in ground.
How Many Fence Posts Do I Need?
Number of posts is fence length divided by spacing, plus one for the end. For 100 ft at 8 ft spacing: 100 ÷ 8 = 12.5, floor = 12, plus 1 = 13 posts. The actual spacing between posts adjusts slightly to fit the length.
6–8 ft spacing is typical for wood; metal posts can go 8–10 ft. Check local codes. Buy 1–2 extra for corners and gates. Use our Concrete Calculator for post hole concrete.
People Also Ask
- How far apart should fence posts be?
- How many posts do I need for my fence?
- Does post spacing change by fence type?
Want to learn more?
Read our full guide: Fence Post Spacing Guide — spacing by material and height, the post depth rule, and wind resistance factors.
Last updated: February 2026