Fence Calculator

Formula

ceil(length÷spacing)+1

Worked example

20m at 2m spacing — 11 posts

Quick answer

What does the Fence Calculator do?

Estimate fence posts from total length and maximum spacing.

What is the Fence Calculator?

Estimate fence posts from total length and maximum spacing. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula ceil(length÷spacing)+1. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

20m at 2m spacing 11 posts

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.