Rectangle Fence Perimeter Calculator
Estimate rectangle fence perimeter for your project with our free calculator. Get accurate material quantities, costs, and specifications.
Reviewed by Abdullah, Technical Content Specialist
Formula
Perimeter = 2 x (Length + Width); Fence = Perimeter - Gate Openings
Calculate the full perimeter of the rectangle by adding length and width then multiplying by two. Subtract any gate openings to find the actual linear feet of fencing needed. Divide by panel width to determine panel count, and add one post per panel plus extras for gates and corners.
Worked Examples
Example 1: Standard Backyard Fence
Problem:Fence a 100 ft x 50 ft yard with one 4-ft gate at $25/ft.
Solution:Perimeter = 2(100 + 50) = 300 ft\nGate deduction = 4 ft\nFence needed = 300 - 4 = 296 ft\nPanels (8 ft) = ceil(296/8) = 37\nPosts = 37 + 1 + 2 = 40\nCost = 296 x $25 = $7,400
Result:296 linear feet, 37 panels, 40 posts, $7,400
Example 2: Large Property with Double Gate
Problem:Fence a 200 ft x 150 ft property with two 6-ft gates at $30/ft.
Solution:Perimeter = 2(200 + 150) = 700 ft\nGate deduction = 6 x 2 = 12 ft\nFence needed = 700 - 12 = 688 ft\nPanels = ceil(688/8) = 86\nPosts = 86 + 1 + 4 = 91\nCost = 688 x $30 = $20,640
Result:688 linear feet, 86 panels, 91 posts, $20,640
Frequently Asked Questions
How do I calculate the perimeter of a rectangular fence?
The perimeter of a rectangle is calculated as 2 times the length plus 2 times the width, or P = 2(L + W). For a 100 ft by 50 ft yard, the perimeter is 2(100 + 50) = 300 linear feet. Subtract any gate openings from this total to get the actual fence material needed. Remember to account for corner posts and gate posts separately in your materials list.
How many fence panels do I need for my yard?
Divide your total fence length (minus gates) by the panel width, which is typically 8 feet for standard pre-built panels or 6 feet for some privacy fence styles. Always round up since partial panels require cutting a full panel. For example, 250 linear feet divided by 8-foot panels equals 32 panels. Buy one or two extras for cutting waste and future repairs.
How many fence posts do I need?
You need one more post than the number of panels, plus two additional posts for each gate opening. Standard post spacing is 8 feet on center, matching panel width. Corner posts and gate posts should be set deeper (at least 3 feet deep) and may require larger diameter posts for structural support. For a 300-foot perimeter with 8-foot panels, plan on about 39 line posts plus 4 corner posts.
How much does it cost to fence a rectangular yard?
Fence costs vary widely by material. Wood privacy fencing typically runs $15 to $30 per linear foot installed, chain link costs $10 to $20 per foot, vinyl ranges from $20 to $40 per foot, and wrought iron can exceed $30 to $100 per foot. A 300-foot perimeter with wood privacy fencing at $25 per foot would cost approximately $7,500. Gate hardware, corner bracing, and permits add 10 to 15 percent to the total.
References
Reviewed by Abdullah, Technical Content Specialist · Editorial policy