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Math.sign() - JavaScript | MDN
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Math.sign()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.
The Math.sign() static method returns 1 or -1, indicating the sign of the number passed as argument. If the input is 0 or -0, it will be returned as-is.
Try it
console.log(Math.sign(3));
// Expected output: 1
console.log(Math.sign(-3));
// Expected output: -1
console.log(Math.sign(0));
// Expected output: 0
console.log(Math.sign("-3"));
// Expected output: -1
Syntax
js
Math.sign(x)
Parameters
x-
A number.
Return value
A number representing the sign of x:
- If
xis positive, returns1. - If
xis negative, returns-1. - If
xis positive zero, returns0. - If
xis negative zero, returns-0. - Otherwise, returns
NaN.
Description
Because sign() is a static method of Math, you always use it as Math.sign(), rather than as a method of a Math object you created (Math is not a constructor).
Examples
Using Math.sign()
js
Math.sign(3); // 1
Math.sign(-3); // -1
Math.sign("-3"); // -1
Math.sign(0); // 0
Math.sign(-0); // -0
Math.sign(NaN); // NaN
Math.sign("foo"); // NaN
Math.sign(); // NaN
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-math.sign |
Browser compatibility
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