Decks & Fences

Fence Post Spacing Calculator

Decision support

What this tool helps you decide

Best for

Fence-run, section and post planning.

Enter

Total run, gate openings, post spacing and extra corners or ends.

You get

Fence runs, sections and a preliminary post count.

Check before buying

Gate posts, wind, soil, footing depth and local requirements need a separate design check.

What you will get

1. Needed

See the estimated project quantity from your measurements.

2. Buy

Add waste and round to complete bags, boxes, cans, bundles or delivery quantities.

3. Check

Review product coverage, site conditions, local requirements and supplier details before ordering.

Quick answer: Estimate fence sections, post count, and approximate spacing from total run length and a maximum planning interval. Start with actual measurements, use the product label for coverage or yield, and treat the result as a planning estimate until site conditions and supplier requirements are confirmed.

Estimate fence sections and post count from run length and a maximum planning spacing.

Project inputs

Enter fence run and spacing

Before you order

Use the result card above to copy, print or share the estimate, then verify the final order with the product label or supplier quote.

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How the fence calculator works

The fence run is divided by your maximum planning spacing, then rounded up to a whole number of sections. Posts are counted at section boundaries, with a separate input for extra corners or ends.

sections = ceil(run ÷ max spacing)

Example

A 120 ft run with an 8 ft maximum interval creates 15 sections before adding any extra corner or end posts.

Planning only: this calculator does not select code-required spacing, structural dimensions, footing depth, wind design, or gate-post requirements. Use the applicable design and local requirements.

Fence calculator FAQ

Why does spacing sometimes become slightly smaller?

The calculator treats your spacing as a maximum and divides the run into equal sections that do not exceed it.

Are corner posts included?

Use the extra-post input for project-specific corners, ends, or other additional posts.

Does this size the posts?

No. It estimates count and spacing only.