What is the Square Root Calculator?
Find the square root of a number and check whether it is a perfect square.
Enter number and the Square Root Calculator returns square root, perfect square and square of the number. Results update as you type, and nothing you enter leaves your device.
How it is calculated
√x is the number that gives x when multiplied by itself
How to use it
- Enter number.
- Read square root 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 Root Calculator use?
It uses: √x is the number that gives x when multiplied by itself.
What do I need to use the Square Root Calculator?
You need number. Sensible starting values are filled in so you can see how it works straight away.
Is the Square Root 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.