/JavaScript

# Math.sqrt()

The Math.sqrt() static method returns the square root of a number. That is

$β x β₯ 0 , πΌπππ.ππππ ( π‘ ) = x = the unique y β₯ 0 such that y 2 = x \forall x \geq 0,;\mathtt{\operatorname{Math.sqrt}(x)} = \sqrt{x} = \text{the unique } y \geq 0 \text{ such that } y^2 = x$

## Syntax

js
Math.sqrt(x)


### Parameters

x

A number greater than or equal to 0.

### Return value

The square root of x, a nonnegative number. If x < 0, returns NaN.

## Description

Because sqrt() is a static method of Math, you always use it as Math.sqrt(), rather than as a method of a Math object you created (Math is not a constructor).

## Examples

### Using Math.sqrt()

js
Math.sqrt(-1); // NaN
Math.sqrt(-0); // -0
Math.sqrt(0); // 0
Math.sqrt(1); // 1
Math.sqrt(2); // 1.414213562373095
Math.sqrt(9); // 3
Math.sqrt(Infinity); // Infinity


## Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android Deno Node.js
sqrt 1 12 1 3 1 18 4 10.1 1 1.0 4.4 1.0 0.10.0