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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,

\begin{aligned} \forall x \geq 1, 𝙼𝚊𝚝𝚑.𝚊𝚌𝚘𝚜𝚑 (𝚡) & = arcosh (x) = the unique y \geq 0 such that cosh (y) = x \\ = ln (x + \sqrt{x^{2} - 1}) \end{aligned}

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

Math.acosh(x)

Parameters

x: A number greater than or equal to 1.

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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This page was last modified on ⁨Jul 10, 2025⁩ by MDN contributors.

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Math.acosh()

Try it

Syntax

Parameters

Return value

Description

Examples

Using Math.acosh()

Specifications

Browser compatibility

See also

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