√ Square Root Calculator

Square Root Result

What is a Square Root?

The square root of a number x is the value that, when multiplied by itself, gives x. It is written as √x. For example, √144 = 12 because 12 × 12 = 144. Every positive number has two square roots: a positive and a negative root.

Square Root Formula

√x = x^(1/2) — the number which when squared gives x

Perfect Squares (1–20)

√1
= 1
√4
= 2
√9
= 3
√16
= 4
√25
= 5
√36
= 6
√49
= 7
√64
= 8
√81
= 9
√100
= 10

FAQ – Square Root Calculator

What is the square root of 2? ▼
√2 ≈ 1.41421356... It is an irrational number, meaning it cannot be expressed as a simple fraction. Enter 2 in our calculator to see the full decimal result.
Can I find the square root of a negative number? ▼
In real numbers, square roots of negative numbers are undefined. They result in imaginary numbers (e.g., √−1 = i). Our calculator works with positive numbers and zero.
What is a perfect square? ▼
A perfect square is a number whose square root is a whole integer. Examples: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100. The calculator will tell you if your number is a perfect square.