Math.acosh()
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.acosh() static method returns the inverse hyperbolic cosine of a number. That is,
Try it
console.log(Math.acosh(0.999999999999));
// Expected output: NaN
console.log(Math.acosh(1));
// Expected output: 0
console.log(Math.acosh(2));
// Expected output: 1.3169578969248166
console.log(Math.acosh(2.5));
// Expected output: 1.566799236972411
Syntax
js
Math.acosh(x)
Parameters
x-
A number greater than or equal to 1.
Return value
The inverse hyperbolic cosine of x. If x is less than 1, returns NaN.
Description
Because acosh() is a static method of Math, you always use it as Math.acosh(), rather than as a method of a Math object you created (Math is no constructor).
Examples
Using Math.acosh()
js
Math.acosh(0); // NaN
Math.acosh(1); // 0
Math.acosh(2); // 1.3169578969248166
Math.acosh(Infinity); // Infinity
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-math.acosh |
Browser compatibility
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