What is the Square Calculator?
Calculate the area, perimeter and diagonal of a square from one side.
Enter side and the Square Calculator returns area, perimeter and diagonal. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Area = side²
Perimeter = 4 × side
How to use it
- Enter side.
- Read area in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Square Calculator use?
It uses: Area = side²; Perimeter = 4 × side.
What do I need to use the Square Calculator?
You need side. Sensible starting values are filled in so you can see how it works straight away.
Is the Square Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.