Outdoor Projects calculator

Fence CalculatorLength, Sections & Posts

Calculate fence length, sections and approximate post count for a rectangular yard. Include gates and choose section spacing for a quick material estimate.

Updated August 20, 2026

✓Instant estimateNo sign-up required

✓Clear formulaSee how the result is built

✓Practical unitsBoxes, bags, sheets or volume

✓Editable wasteAdjust for your project

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Project details

Enter your measurements and material details.

Planning estimate only. Actual quantities vary with cuts, layout, site conditions and product specifications.

💡Tip:

Locate property lines and underground utilities before installation.

How the Fence Calculator works

This calculator gives a planning estimate for fencing around a rectangular area. It subtracts gate openings from total perimeter, estimates the number of standard sections, and provides an approximate post count. Corners, gate construction, transitions and terrain can change the final layout.

Formula

Perimeter = 2 × (length + width). Fence run = perimeter − gate widths. Sections = fence run ÷ section spacing, rounded up.

Measure before you buy

Measure the actual proposed fence line rather than relying on lot dimensions. Property boundaries, easements and setbacks may differ from the area you plan to enclose. If the fence changes direction several times, measure each run separately and add the lengths.

Locate property lines and underground utilities before installation.
Gate posts are often larger or set differently from ordinary line posts.
Stepped or racked fences on slopes may require more panels, posts or custom cuts.

Common questions

How do I calculate fence linear feet?

Add every fence run. For a simple rectangle, use twice the length plus twice the width.

Does the calculator include gates?

Yes. Enter the number of gates and width of each gate to subtract those openings from panel run.

How far apart are fence posts?

Spacing depends on fence system. Eight feet is common for many panel layouts, but follow the product or design requirements.

Are corner posts included?

The estimate is approximate. A real layout should count corner, end and gate posts individually.

Do I need a survey?

When boundary location is uncertain, a professional survey may prevent costly placement disputes.

Worked example: Fence Calculator

Using the example inputs shown in the calculator — Yard length (ft) = 80, Yard width (ft) = 50, Number of gates (count) = 1, Gate width each (ft) = 4, Section/post spacing (ft) = 8 — the result is 256 linear ft. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.

The result breakdown also shows Fence sections: 32; Approx. posts: 34. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.

For this fence calculator, the inputs with the greatest practical effect are yard length, yard width and number of gates. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.