Perimeter Calculator

Use our free perimeter calculator to find the perimeter of common shapes. Select a shape type, enter the dimensions, and get the perimeter instantly.

Math

Shape

Dimension A

Dimension B

Dimension C

Formula

Find the perimeter of common geometric shapes. Select a shape and enter the required dimensions to compute the perimeter.

Depends on shape

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Select the shape type from the dropdown.
2Enter the required dimensions.
3Click Calculate to see the perimeter.

Examples

Perimeter of a square with side 5

1.Select shape = Square.
2.Enter Dimension A = 5.
3.Perimeter = 4 × 5 = 20 units.

Result: 20.0000 units

Perimeter of a rectangle 8 by 3

1.Select shape = Rectangle.
2.Enter Dimension A = 8, Dimension B = 3.
3.Perimeter = 2 × (8 + 3) = 22 units.

Result: 22.0000 units

Frequently Asked Questions

Square, rectangle, circle (circumference), and triangle.

P = 4s, where s is the side length.

C = 2πr, where r is the radius.

P = a + b + c, where a, b, c are the three side lengths.

Any consistent unit. All dimensions must use the same unit.

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Area Calculator Circle Calculator Square Calculator Rectangle Calculator Percentage Calculator Basic Calculator

CalculateMe Team

Last updated: 2026-07-13

Perimeter Calculator

Formula

How It Works

Examples

Perimeter of a square with side 5

Perimeter of a rectangle 8 by 3

Frequently Asked Questions

What shapes are supported?

What is the formula for square perimeter?

What is the formula for circle circumference?

How is triangle perimeter calculated?

What units should I use?

Related Calculators

Perimeter Calculator

Formula

How It Works

Examples

Perimeter of a square with side 5

Perimeter of a rectangle 8 by 3

Frequently Asked Questions

What shapes are supported?

What is the formula for square perimeter?

What is the formula for circle circumference?

How is triangle perimeter calculated?

What units should I use?

Related Calculators