Fence Post Spacing Calculator
Enter the total fence run and maximum spacing to divide the fence into equal bays without exceeding your chosen spacing. Then use the Fence Post Concrete Calculator for hole and bag quantities, or the full Fence Calculator for the complete material takeoff.
Fence post spacing
See how total fence length and maximum post spacing work together, with spacing measured center-to-center between posts.
Enter your project measurements to see the estimate.
Check the method or common questions
Method, formula & assumptions
Fence material planning
Formula: Fence calculations divide each fence run into bays based on your chosen maximum spacing. Multi-side layouts calculate bays per side so direction changes land on posts. Picket calculations use the combined picket width and gap, and gate openings are deducted from the planned fence run.
Worked example: Example: a 64 ft straight run with an 8 ft maximum spacing creates 8 bays and normally 9 posts before gate adjustments. Multi-side layouts repeat the bay calculation separately for each side.
Before you buy: Corners, gates, grade changes and local structural requirements can affect material quantities. Enter each side in the project plan for multi-run layouts, then verify field dimensions, gate locations and local requirements before ordering.
Fence Post Spacing Calculator FAQ
Why can actual post spacing be less than my maximum?
Each run is divided into equal bays so no bay exceeds the maximum spacing you entered.
Does the Fence Calculator include gates?
Yes. Enter the number and width of gate openings under Customize project details. PlanDIYBuild deducts the openings from the planned fence run and includes the gate posts in the takeoff; verify the actual gate framing and hardware before building.
Continue your Fence project
Use the Fence planning hub for related calculators and quick-reference guides.
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