Math.atanh()
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.atanh() static method returns the inverse hyperbolic tangent of a number. That is,
Try it
console.log(Math.atanh(-1));
// Expected output: -Infinity
console.log(Math.atanh(0));
// Expected output: 0
console.log(Math.atanh(0.5));
// Expected output: 0.549306144334055 (approximately)
console.log(Math.atanh(1));
// Expected output: Infinity
Syntax
js
Math.atanh(x)
Parameters
x-
A number between -1 and 1, inclusive.
Return value
The inverse hyperbolic tangent of x. If x is 1, returns Infinity. If x is -1, returns -Infinity. If x is less than -1 or greater than 1, returns NaN.
Description
Because atanh() is a static method of Math, you always use it as Math.atanh(), rather than as a method of a Math object you created (Math is not a constructor).
Examples
Using Math.atanh()
js
Math.atanh(-2); // NaN
Math.atanh(-1); // -Infinity
Math.atanh(-0); // -0
Math.atanh(0); // 0
Math.atanh(0.5); // 0.5493061443340548
Math.atanh(1); // Infinity
Math.atanh(2); // NaN
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-math.atanh |
Browser compatibility
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