Run this calculation separately between terminal posts. Terminal posts include ends, corners, and gate posts and often differ from line posts in size or reinforcement.
01 / Formula
How this is calculated
Intervals = ceiling(run length ÷ maximum spacing); equal spacing = run length ÷ intervals02 / Assumptions
What the estimate assumes
- ✓The input is one straight run between terminal locations.
- ✓Maximum spacing comes from the selected system or design.
- ✓Terminal posts are entered separately.
03 / Worked example
See the math in context
A 31-ft run with an 8-ft maximum needs 4 equal intervals of 7.75 ft, 3 line posts, and 2 terminal posts.
04 / Guidance
Equalize the bays
Avoid leaving a short final bay. Divide the full run by the calculated interval count and mark each center consistently from the same reference point.
05 / Guidance
Spacing is a design input
Fence height, openness, wind, soil, post section, footing, rails, infill, and local requirements can change allowable spacing. Use the project-specific value.
Questions
Frequently asked
Do fence prices or dimensions have universal defaults?+
No. Product dimensions, labor, access, soil, wind exposure, finish, gates, permits, and local markets vary. Enter the measurements and current quotes for your project.
Does the result replace a site plan or product instructions?+
No. Treat it as a planning estimate. Confirm boundaries, utilities, easements, local rules, structural requirements, and the manufacturer’s instructions before work begins.
How should I handle corners and gates?+
Measure each straight run separately. Count end, corner, and gate posts as terminal posts, and subtract actual gate openings from fence fabric or panel length.
Sources