Square Root Calculator

About this calculator

This calculator finds the square root (√x) and cube root (∛x) of any number you enter, including negative numbers for the cube root, which is defined for negatives while the square root is not. Results are shown with several decimal places of precision, and it also flags when a number is a perfect square, such as 144 or 225.

Students use it to check algebra and geometry homework, engineers use it when solving for a side length from an area or a signal's RMS value, and it's a quick way to verify calculations involving the Pythagorean theorem or standard deviation, both of which rely on square roots.