Perimeter of Rectangle
Calculate the perimeter of any rectangle by entering length and width. Free online rectangle perimeter calculator with instant results for construction, fencing, framing, and geometry problems.
About This Calculator
The Perimeter of Rectangle Calculator computes the total distance around any rectangle by adding twice the length and twice the width. This essential geometry tool is used by students, teachers, contractors, landscapers, and DIY enthusiasts for fencing, framing, baseboards, trim, and any project requiring boundary measurement of a rectangular space.
The perimeter formula is P = 2(L + W), where L is the length and W is the width. For example, a rectangle measuring 10 ft by 5 ft has a perimeter of 30 ft. This works for any unit (feet, meters, inches, centimeters) as long as both dimensions use the same unit.
How to Use the Calculator
- Enter the length of the rectangle in any unit (feet, meters, inches, etc.)
- Enter the width of the rectangle in the same unit
- Click "Calculate Perimeter" to get the total distance around the rectangle
Understanding the Formula
A rectangle has two pairs of equal sides: two lengths (L) and two widths (W). The perimeter is the sum of all four sides: P = L + W + L + W = 2(L + W). This formula applies to all rectangles, from tiny rectangles on graph paper to large building foundations.
Common Uses
- Fencing: Calculate the amount of fencing needed for a rectangular yard or garden
- Construction: Estimate baseboard, crown molding, or trim for rectangular rooms
- Framing: Determine lumber needed for picture frames, windows, or doors
- Education: Verify geometry homework and understand perimeter concepts
- Landscaping: Measure edging, borders, and pathways around rectangular garden beds
Frequently Asked Questions
How do you find the perimeter of a rectangle?
The perimeter of a rectangle is calculated as P = 2(L + W), where L is the length and W is the width. Add the length and width, then multiply by 2.
What is the perimeter formula for a rectangle?
The formula for the perimeter of a rectangle is P = 2(l + w), where l is the length and w is the width. This gives the total distance around the rectangle.
What is the perimeter of a 10 ft by 5 ft rectangle?
A rectangle with length 10 ft and width 5 ft has a perimeter of 30 ft. This is calculated as 2(10 + 5) = 30 ft.
Can I use this for fencing estimates?
Yes, this calculator is ideal for estimating fencing, framing, baseboard, or any material needed to go around a rectangular area.
Is this calculator free to use?
Yes, all calculators on Calculy are completely free to use with no registration required.
Can I share my calculation?
Yes, the URL saves your length and width inputs so you can bookmark or share the exact calculation.
What is the difference between perimeter and area of a rectangle?
Perimeter is the distance around the rectangle (P = 2(L + W)) measured in linear units. Area is the space inside the rectangle (A = L x W) measured in square units. For a 10 ft by 5 ft rectangle, the perimeter is 30 ft and the area is 50 square feet.
Can I calculate the perimeter if I only know the area and one side?
Yes, divide the area by the known side to find the missing side, then apply the perimeter formula P = 2(L + W). For example, if area is 50 sq ft and length is 10 ft, width is 5 ft and perimeter is 30 ft.