Perimeter of a Square Calculator

Created by Hanna Pamuła, PhD
Reviewed by Bogna Szyk and Adena Benn
Last updated: Jun 05, 2023


This perimeter of a square calculator will help you with this basic calculation. Type the side length to obtain the perimeter, or use our tool the other way round: enter the perimeter to get the side length. If you're not sure what a perimeter of a square is or you've just forgotten the formula for the perimeter of a square, keep scrolling! You may also be interested in our square calculator, which also finds the square area and diagonal.

What is the perimeter of a square - formula

Image presenting perimeter of a square

The perimeter of a square is equal to the sum of all square sides. Because a square has all four sides equal in length, the perimeter is:

perimeter = a + a + a + a = 4 × a

A square is the quadrilateral of the least perimeter enclosing a given area:

16 × area = perimeter² (because area = a² and perimeter² = (4 × a)² = 16 × a²

For every other quadrilateral than square, the inequality occurs:

16 × area < perimeter²

This means that a square has a larger area than any other quadrilateral with the same perimeter.

What is the perimeter of a 4 in square?

The perimeter of such a square is calculated by adding all the sides together or multiplying the side length by 4:

perimeter = 4 in + 4 in + 4 in + 4 in = 4 × 4 in = 16 in

Image explaining how to find the perimeter of a square

How to use the perimeter of a square calculator?

Let's have a look at an example. Imagine that you received a square-shaped gift from your friend, a lovely oil painting. You would like to make a frame for it. However, you have no idea how long the pine board needs to be. Yes, you guessed right, you can use the perimeter of a square calculator!

  1. Measure the side of the square. For example, our painting's side is 3 ft 6 in. Change the unit by simply clicking on its name and then typing the value into the box.
  2. The perimeter of the square appears: it's 14 ft in our case. Of course, it's only an example. In real life, you'll probably need more material depending on frame and board width and the way of joining frame corners.

Other similar calculator

Now that you know what is the perimeter of a 4 square and many more, you should look at these other similar calculators:

Hanna Pamuła, PhD
Image of a square with side a and diagonal d. Perimeter of a square
Side a
in
Diagonal d
in
Perimeter
in
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