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

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

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


Math.SQRT2 is a constant and a more performant equivalent to Math.sqrt(2).

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


ECMAScript Language Specification
# sec-math.sqrt2

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See also