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Chain Link Fence Post Spacing Calculator

Calculate the number of line posts needed for a chain link fence run.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
328 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Fence posts needed

35 posts

High confidence

Running these inputs gives 35 as the fence posts needed. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Post count = ceil(fence length ÷ post spacing) + 1, the standard layout method for spacing chain link fence line posts (commonly 3m/10ft o.c.)

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why add 1 to the number of spacing intervals?
A post is needed at both ends of the run as well as at each spacing interval in between, so the total post count is always one more than the number of ceil(length ÷ spacing) intervals.
Why is line post spacing commonly capped around 3m (10ft)?
Chain link fabric needs support at close enough intervals to stay taut and resist wind and impact loads — around 3m (10ft) on center is a common maximum spacing for line posts.
Does this include corner, end, or gate posts?
No — this calculates line post count only, for the straight run length entered. Corner posts, end posts, and gate posts are heavier-duty units placed at direction changes and openings, and should be counted separately from your layout.