Perimeter Calculator

Calculate the perimeter of various geometric shapes with ease.

Calculator

Enter Shape Dimensions

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1 What is Perimeter?

2 Perimeter Formulas

3 How to Calculate Perimeter

4 Practical Examples

Concept

What is Perimeter?

The perimeter is the total distance around the outside of a two-dimensional shape. It's the sum of all the sides of the shape. Perimeter is measured in linear units such as meters, centimeters, inches, or feet.

Formulas

Perimeter Formulas

Rectangle

P = 2(l + w)

where l is length and w is width

Square

P = 4s

where s is the length of one side

Triangle

P = a + b + c

where a, b, and c are the lengths of the three sides

Steps

How to Calculate Perimeter

1
Identify the shape you're working with
2
Measure all sides of the shape
3
Apply the appropriate formula for the shape
4
Add up all the sides to get the total perimeter

Examples

Practical Examples

Rectangle Example

A rectangle has a length of 5 units and a width of 3 units.

P = 2(l + w)

P = 2(5 + 3)

P = 2(8)

P = 16 units

Square Example

A square has sides of 4 units each.

P = 4s

P = 4(4)

P = 16 units

Triangle Example

A triangle has sides of 3, 4, and 5 units.