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Math.sqrt()

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

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

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Syntax

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()

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

	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