Fence Post Spacing Calculator
Estimate the number of fence spans and posts needed for a straight fence length using a maximum span distance.
How to use this calculator
- Enter total run length and the largest permitted distance between posts.
- Check that all inputs use the same units, time period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by fence post spacing calculator calculator
Spans = ceiling(total length ÷ maximum span); posts = spans + 1 for a simple straight line.
- Spans = ceiling(total length ÷ maximum span); posts = spans + 1 for a simple straight line.
- Actual spacing, post size, foundations, wind load, soil and local requirements affect the build. This simple model assumes a straight run and no gate openings.
- The tool validates entered values and formats results for readability; it does not verify assumptions against external records.
Worked examples
Worked example
A 30 m fence with spans no longer than 2.4 m.
Ceiling(30 ÷ 2.4) = 13 spans and 14 posts.
Plan for 14 posts along one straight run before accounting for gates, corners or terminal-post design.
Understanding the result
Estimate the number of fence spans and posts needed for a straight fence length using a maximum span distance.
Actual spacing, post size, foundations, wind load, soil and local requirements affect the build. This simple model assumes a straight run and no gate openings.
Important notes
Actual spacing, post size, foundations, wind load, soil and local requirements affect the build. This simple model assumes a straight run and no gate openings.
Treat the result as an estimate based on the entered inputs. For regulated, engineering, employment, tax or business decisions, check applicable official rules, specifications and professional guidance.
Frequently asked questions
Does this include corner braces?
No. Add corner, gate and end-post requirements separately according to the fence design.
Will exact spacing be equal?
The tool divides the length across an integer number of spans; the resulting equal spacing will be at or below the entered maximum.
How should I use the result?
Actual spacing, post size, foundations, wind load, soil and local requirements affect the build. This simple model assumes a straight run and no gate openings.
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Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.