JavaScript (ES2026) reference · Math Methods and Constants

JavaScript Math.abs() Method

Return the absolute value of a number: its distance from zero, so Math.abs(-5) is 5.

JavaScript (ES2026) Since ES1

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Syntax

Math.abs(x)

Parameter	Description
`x`	A number.

A non-negative number (or NaN).

Absolute valuesTry it yourself

console.log(Math.abs(-7.5), Math.abs(3), Math.abs("-2"), Math.abs("x"));

Output

7.5 3 2 NaN

Compare floats with a toleranceTry it yourself

const a = 0.1 + 0.2, b = 0.3;
console.log(a === b, Math.abs(a - b) < Number.EPSILON);

Output

false true

Version	Change
JavaScript ES1	Added

Math.sign() · Return 1, -1 or 0 depending on whether a number is positive, negative or zero.
Number.EPSILON · The smallest difference between 1 and the next representable number, used as a tolerance when comparing floats.
JavaScript Math · tutorial
JavaScript Numbers · tutorial