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

\mathtt{Math.SQRT1_2} = \sqrt{\frac{1}{2}} \approx 0.707

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

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 calculates the side length of a square given its diagonal length:

function getSquareSideLength(diagonalLength) {
  return diagonalLength * Math.SQRT1_2;
}

Specifications

Specification
ECMAScript® 2027 Language Specification # sec-math.sqrt1_2

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`SQRT1_2`	1	12	1	3	1	18	4	10.1	1	1.0	4.4	1	1.0.0	1.0	0.10.0