JavaScript sqrt() Method

Return the square root of a number:

Math.sqrt(9);

More "Try it Yourself" examples below.

Definition and Usage

The sqrt() method returns the square root of a number.

Method
sqrt()	Yes	Yes	Yes	Yes	Yes

Math.sqrt(x)

Parameter	Description
x	Required. A number

Return Value:	A Number. If x is a negative number, NaN is returned
JavaScript Version:	ECMAScript 1

Return the square root of different numbers:

var a = Math.sqrt(0);
var b = Math.sqrt(1);
var c = Math.sqrt(9);
var d = Math.sqrt(64);
var e = Math.sqrt(-9);