Square Root Calculator
Find the square root of any non-negative number and check if it is a perfect square.
Quick answer: enter your details below and click Calculate — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
S
Calculators
Enter your details below.
How to use
- Enter a number zero or larger.
- Calculate to see its square root.
- Check the note to see if it is a perfect square.
About this tool
Enter a number and the tool finds the value that, multiplied by itself, gives your number back. It also tells you whether your number is a perfect square, meaning its square root is a whole number, like 144, whose square root is exactly 12.
Frequently asked questions
Can I find the square root of a negative number?
Not with real numbers. A number multiplied by itself is never negative, so the tool asks for a non-negative number instead.
What is a perfect square?
A number you get by squaring a whole number, such as 1, 4, 9, 16, 25 and 144. Its square root is a whole number with no decimal part.