Math.sqrt()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

x0,𝙼𝚊𝚝𝚑.𝚜𝚚𝚛𝚝(𝚡)=x=the unique y0 such that y2=x\forall x \geq 0,\;\mathtt{\operatorname{Math.sqrt}(x)} = \sqrt{x} = \text{the unique } y \geq 0 \text{ such that } y^2 = x

Try it

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

Specifications

Specification
ECMAScript Language Specification
# sec-math.sqrt

Browser compatibility

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See also