Fence Post Spacing Calculator
Tell us the fence run and the maximum spacing you will allow. MeasureMarks determines how many posts you need and exactly where every post center goes.
Post layout
Post center marks
Measured from the starting edgeWhy this calculator is different
You give MeasureMarks the construction rule — the maximum allowable post spacing — instead of guessing a post count. It adds enough posts to stay under that maximum, then divides the run evenly so every bay matches.
Fence post job sheet
Project
Dimensions
Layout
Post center mark list
Turn a maximum post spacing into a buildable layout
The Fence Post Spacing Calculator divides a long run into equal post intervals without exceeding the maximum center-to-center spacing you specify. That is useful for fence lines, deck posts, rails, screens, and other repeated structural or support locations.
How the spacing is determined
MeasureMarks calculates the minimum number of intervals required to keep every interval at or below the maximum spacing. It then divides the usable run evenly so the final layout does not end with one odd short bay. The blueprint shows post width, clear opening between posts, and the actual center-to-center spacing.
Measurement tips
- Decide whether your total run is measured to the post centers or to the outside faces before entering the dimensions.
- Use actual post width when the clear gap matters.
- Verify structural and local-code requirements separately; this tool performs layout math, not engineering.
- Print the plan before setting posts so the crew can work from the same datum.
Why can actual spacing be less than my maximum?
The maximum is a ceiling. Equal spacing usually requires a slightly smaller interval so the whole run divides cleanly.
Does the tool account for post width?
Yes. The blueprint distinguishes post width, clear gap, and center-to-center spacing.