Square Root Calculator
Find the square root, cube root and any nth root of a number.
Gives the square root, cube root and any nth root. Negative numbers have no real square root (or even root), shown as —. Runs in your browser.
Enter a number to get its square root and cube root, plus any nth root you choose by setting the degree. It also tells you when a number is a perfect square. Negative numbers have no real square root (or even root), which the tool indicates. Runs in your browser.
How to use the Square Root Calculator
- Enter a number.
- Read the square root and cube root.
- Set the degree for any other nth root.
Frequently asked questions
What is a square root?
The square root of a number x is the value that, multiplied by itself, gives x. For example √9 = 3 because 3 × 3 = 9.
Can you take the square root of a negative number?
Not within the real numbers — there's no real value whose square is negative. The tool shows — for the square root (and even roots) of negatives.
What's a perfect square?
A number whose square root is a whole number, like 16 (√16 = 4) or 81 (√81 = 9). The tool flags these.