Square Root Calculator

Calculate the square root of any number instantly. Also works for cube roots and nth roots.

How to Calculate a Square Root

The square root of a number N is a value X such that X × X = N. For example, √144 = 12 because 12 × 12 = 144.

Frequently Asked Questions

What is a perfect square?
A perfect square is a number whose square root is a whole number, like 4, 9, 16, 25, 36, etc.

What is the square root of 2?
√2 ≈ 1.414214. It is an irrational number that cannot be expressed as a simple fraction.

Can you take the square root of a negative number?
Not in real numbers. The square root of a negative number is an imaginary number.