Math.SQRT1_2

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

Try it

function getRoot1Over2() {
  return Math.SQRT1_2;
}

console.log(getRoot1Over2());
// Expected output: 0.7071067811865476

Value

𝙼𝚊𝚝𝚑.𝚂𝚀𝚁𝚃𝟷_𝟸=120.707\mathtt{Math.SQRT1_2} = \sqrt{\frac{1}{2}} \approx 0.707
Property attributes of Math.SQRT1_2
Writableno
Enumerableno
Configurableno

Description

Math.SQRT1_2 is a constant and a more performant equivalent to Math.sqrt(0.5).

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:

js
function getRoot1_2() {
  return Math.SQRT1_2;
}

getRoot1_2(); // 0.7071067811865476

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-math.sqrt1_2

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
SQRT1_2

Legend

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Full support
Full support

See also