Math.sqrt()

The Math.sqrt() static method returns the square root of a number. That is

{{InteractiveExample("JavaScript Demo: Math.sqrt()")}}

```js interactive-example function calcHypotenuse(a, b) { return Math.sqrt(a * a + b * b); }

console.log(calcHypotenuse(3, 4)); // Expected output: 5

console.log(calcHypotenuse(5, 12)); // Expected output: 13

console.log(calcHypotenuse(0, 0)); // Expected output: 0

## Syntax

```js-nolint
Math.sqrt(x)

Parameters#

• x
• : A number greater than or equal to 0.

Return value#

The square root of x, a nonnegative number. If x < 0, returns {{jsxref("NaN")}}.

Description#

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

Examples#

Using Math.sqrt()#

Math.sqrt(-1); // NaN
Math.sqrt(-0); // -0
Math.sqrt(0); // 0
Math.sqrt(1); // 1
Math.sqrt(2); // 1.414213562373095
Math.sqrt(9); // 3
Math.sqrt(Infinity); // Infinity

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Math.cbrt()")}}
• {{jsxref("Math.exp()")}}
• {{jsxref("Math.log()")}}
• {{jsxref("Math.pow()")}}