√ Square Root Calculator

About this Square Root Calculator

This root calculator gives you the square root and cube root of any number to six decimal places. It also tells you whether the number is a perfect square — one that is a whole number multiplied by itself — which is a common check in maths homework and entrance tests.

How to use it

1. Type the number you want the roots of.
2. Click Calculate roots.
3. Read the square root, the perfect-square check and the cube root.

Example

The square root of 144 is exactly 12, so 144 is a perfect square, and its cube root is about 5.2415.

Frequently asked questions

What is a perfect square?

A whole number whose square root is also a whole number — like 25 (5 × 5), 81 (9 × 9) or 144 (12 × 12).

Can it handle negative numbers?

Cube roots work for negatives (the cube root of −27 is −3). Square roots of negatives are shown as imaginary numbers, marked with an i.

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