# Perimeter of a Square Calculator

Calculate the perimeter of a square based on the entered side length or diagonal length in the chosen units.

Result:

## How to use this calculator?

- Enter the length of side "a" or the length of the diagonal "d" in your chosen unit.
- See the result and optionally change its unit.

You can also check the calculation process below the result.

## How to calculate the Perimeter of a Square?

To calculate the perimeter of a square, multiply the length of one side by four.

P = a * 4

If you don't know the length of "a", you can obtain it based on the diagonal. Just divide the length of the diagonal by the square root of two.
a = d / √2

## Examples

**Example 1:**Calculate the perimeter of a square with a side of 5 cm.

P = a * 4

P = 5 cm * 4

P = 20 cm

**Example 2:**Calculate the perimeter of a square with a diameter of 8 in.

a = d / √2

a = 8 in / √2

a = 5.66 in

P = a * 4

P = 5.66 in * 4

P = 22.64 in