JavaScript (ES2026) reference · Number Methods and Properties

JavaScript Number.EPSILON Property

The smallest difference between 1 and the next representable number, used as a tolerance when comparing floats.

JavaScript (ES2026) Since ES2015

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Syntax

Number.EPSILON

About 2.220446049250313e-16.

The valueTry it yourself

console.log(Number.EPSILON);

Output

2.220446049250313e-16

Compare floating-point resultsTry it yourself

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

Output

false true

Version	Change
JavaScript ES2015	Added

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