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JavaScript sqrt() Method

Math Object Reference JavaScript Math Object

Example

Return the square root of a number:

Math.sqrt(9);

The result will be:

3

Try it yourself »


Definition and Usage

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


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The sqrt() method is supported in all major browsers.


Syntax

Math.sqrt(x)

Parameter Values

Parameter Description
x Required. A number

Return Value

Type Description
Number/NaN A Number, If x is a negative number, NaN is returned

Technical Details

JavaScript Version: 1.0


More Examples

Example

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);

The result of a,b,c,d, and e will be:

0
1
3
8
NaN

Try it yourself »


Math Object Reference JavaScript Math Object

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