✦ SOLVORY FREE TOOLS · HOME & DIY
Fence Post Spacing Calculator — Free Online Tool
Estimate posts and even spacing for independent straight fence runs using maximum post spacing and gate-post extras.
JavaScript is needed for the interactive tool. The formula and worked example remain available below.
How to use the Fence Post Spacing Calculator
Estimate posts and even spacing for independent straight fence runs using maximum post spacing and gate-post extras.
- Enter real measurements or prices in the interactive tool.
- Check unit labels and customize any applicable fees, waste allowances or product-specific rates.
- Review the result, formulas and limitations before using it in purchasing, pricing or production decisions.
Fence Post Spacing Calculator: formula & methodology
Number of spaces = ceil(run length ÷ maximum spacing). For a standalone open run, posts = spaces + 1.
The tool uses your entered values and explicitly labeled assumptions. Final results may be rounded for display, while intermediate arithmetic retains available numeric precision. Verify material, tax, device or platform specifications relevant to your situation.
Worked example
A 100 ft open straight run with maximum eight-foot spacing needs 13 spaces and 14 posts.
Try the example above and then change values to reflect your own project or comparison.
Frequently asked questions
Does this count shared corners?
The tool assumes independent runs. Shared corners and gate structures require a site-specific post layout.
How are posts counted on a straight open run?
For each independent run, N intervals require N+1 posts, including both ends.
Does it correctly count every gate corner?
No. Dedicated gate-post allowances are editable, but shared corners, intersecting runs and real loading need a site-specific layout.