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Rectangle Fence Perimeter Calculator

Construction

Calculate the total perimeter fence length needed to enclose a rectangular yard or lot. Enter length and width to get the fencing footage you need to buy.

12,000
12,000

Total Fence Perimeter

320

This calculator computes your Total Fence Perimeter from the values you enter.

Inputs
Lot LengthLot Width
Outputs
Total Fence Perimeter

What is a Fence Perimeter?

A Rectangle Fence Perimeter Calculator computes the total linear footage of fencing needed to enclose a rectangular yard, garden, or lot, based on its length and width. This is the foundational number behind nearly every fencing project — before you can estimate posts, rails, panels, or cost, you first need to know exactly how much perimeter you're enclosing.

Many residential properties, garden plots, and commercial lots in the US are rectangular or close enough to rectangular that a simple length-and-width measurement gives an accurate perimeter figure. This calculator applies the standard geometry formula so you can go from two measurements to a precise linear footage in seconds, without manually adding up all four sides.

Once you have your total perimeter, the Fence Calculator turns that linear footage into an exact post and rail count for your project.

How to use this Fence Perimeter calculator

  1. Measure the longer side of your rectangular lot and enter it in the Lot Length field, in feet.
  2. Measure the shorter side and enter it in the Lot Width field, in feet.
  3. Review the Total Fence Perimeter result — this is your total linear footage of fencing needed.
  4. Adjust either input if you're comparing different lot dimensions or planning a phased fencing project.
  5. Take the resulting perimeter figure to the Fence Calculator to determine exact post and rail counts for your project.

Formula & Methodology

The calculator uses the standard perimeter formula for a rectangle:

Perimeter = 2 × (Length + Width)

Worked example: For a lot with a length of 100 feet and a width of 60 feet:

- Perimeter = 2 × (100 + 60) = 2 × 160 = 320 feet

So you'd need 320 linear feet of fencing to enclose this lot.

Frequently Asked Questions

Multiply the sum of the length and width by two — for a 100 by 60 foot lot, the perimeter is 2 × (100 + 60), which equals 320 feet. This is the total linear footage of fencing you need to enclose the entire rectangular area.
Perimeter equals 2 multiplied by the sum of the length and the width, written as P = 2 × (L + W). This formula works for any rectangle, whether it's a small garden plot or a large multi-acre lot, as long as all four sides are straight and meet at right angles.
No, this calculator gives you the total enclosing perimeter without subtracting any gate width. If you're ordering fence panels or rail material, subtract your planned gate opening width from the total perimeter separately, since gates are typically framed differently than standard fence sections.
Area (length × width) tells you the total square footage enclosed by the fence, which is relevant for lawn or landscaping calculations, while perimeter (2 × (length + width)) tells you the linear footage of fence material you need to buy. A 100 by 60 foot lot has 6,000 sq ft of area but only 320 feet of perimeter — very different numbers used for different purposes.
Use a long tape measure or measuring wheel along each boundary line, or reference your property's plat survey if you have one on file with your local county recorder. For irregular lots, break the property into rectangular sections, measure each separately, and sum the perimeters of the sections that require fencing.
It's common to add 5 to 10 percent extra material to account for gate framing, corner posts, and cutting waste when working with fence panels of a fixed width. For a 320-foot perimeter, that means budgeting for roughly 335 to 350 feet of usable material.
Enter your lot's length and width in feet using the two input fields or sliders. The calculator instantly returns the total perimeter, which is the linear footage of fence you need to enclose the space.
Yes, a square is simply a rectangle where length and width are equal. Enter the same value for both the Lot Length and Lot Width fields, and the calculator will return the correct perimeter using the same formula.
Many suburban residential lots in the US range from around 5,000 to 10,000 square feet, which for a roughly rectangular lot often translates to a perimeter of 280 to 400 feet depending on the length-to-width ratio. Corner lots and larger properties can require significantly more perimeter fencing.
Take the total perimeter from this calculator and enter it as the fence length in the [Fence Calculator](/fence-calculator/), along with your planned post spacing, to get an exact post and rail count for the full enclosed run.
Not directly — this tool assumes a true four-sided rectangle with right-angle corners. For irregular lots, split the property into rectangular or triangular sections, calculate each section's boundary separately, and add the results together for the total fencing needed.
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