Web/JavaScript/Reference/Global objects/Math/SQRT1 2

The Math.SQRT1_2 property represents the square root of 1/2 which is approximately 0.707:

<math display="block">\mathtt{Math.SQRT1\_ 2} = \sqrt{\frac{1}{2}} = \frac{1}{\sqrt{2}} \approx 0.707</math>

Property attributes of `Math.SQRT1_2`
Writable	no
Enumerable	no
Configurable	no

Description

Because SQRT1_2 is a static property of Math, you always use it as Math.SQRT1_2, rather than as a property of a Math object you created (Math is not a constructor).

Examples

Using Math.SQRT1_2

The following function returns 1 over the square root of 2:

function getRoot1_2() {
  return Math.SQRT1_2;
}

getRoot1_2(); // 0.7071067811865476

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'Math.SQRT1_2' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`SQRT1_2`	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100

Legend

Full support: Full support