The Math.SQRT2 property represents the square root of 2, approximately 1.414:

Math.SQRT2=21.414\mathtt{\mi{Math.SQRT2}} = \sqrt{2} \approx 1.414

Property attributes of Math.SQRT2
Writable no
Enumerable no
Configurable no


Because SQRT2 is a static property of Math, you always use it as Math.SQRT2, rather than as a property of a Math object you created (Math is not a constructor).


Using Math.SQRT2

The following function returns the square root of 2:

function getRoot2() {
  return Math.SQRT2;

getRoot2(); // 1.4142135623730951


Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262)
The definition of 'Math.SQRT2' in that specification.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Math.SQRT2' in that specification.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Math.SQRT2' in that specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

Document Tags and Contributors

 Contributors to this page: fscholz, Mingun,, Sheppy, ethertank, evilpie, Mgjbot, Kyodev, Takenbot, Maian, Dria
 Last updated by: fscholz,