Fence Perimeter Calculator

The Fence Perimeter Calculator tells you exactly how much fencing material you need before you buy or build — accounting for gate openings and post spacing so nothing gets overlooked. Enter your property length and width, along with fence height, post spacing, and any gate openings to get your total fence length. Secondary outputs include the number of posts needed, fence sections, and your property area.

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Number of gates or openings in the fence

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Width of each gate opening

Results

Total Fence Length

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Posts Needed

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Fence Sections

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Property Area

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Frequently Asked Questions

What is the perimeter of a rectangle fence?

The perimeter of a rectangle fence is the total length of fencing needed to enclose a rectangular area. It's calculated using the formula P = 2(L + W), where L is length and W is width.

How much fence do I need for my property?

To determine how much fence you need, measure the length and width of your property. The total fence length equals 2 × (length + width). Subtract any gate openings from this total.

What is a linear foot of fence?

A linear foot of fence refers to one foot of fence length, measured horizontally along the fence line. This is the standard unit for purchasing fencing materials and calculating costs.

How do I calculate fence posts needed?

Divide your total fence perimeter by the post spacing distance, then add one. For example, 300 feet of fence with 8-foot spacing needs approximately 38 posts (300 ÷ 8 + 1).

What spacing should I use between fence posts?

Standard fence post spacing is typically 6-8 feet for most residential fences. Use 6 feet for shorter fences or windy areas, and 8 feet for taller, more stable installations.

Should I account for gates in my fence calculation?

Yes, subtract the width of any planned gates or openings from your total perimeter. Gates are typically purchased separately and don't require the same linear footage of fencing material.

How many feet of fence do I need for 1 acre?

One acre (43,560 sq ft) in a perfect square would need approximately 835 feet of fence (209 feet per side). However, most properties aren't perfect squares, so measure your actual dimensions.