The Number.EPSILON property represents the difference between one and the smallest value greater than one that can be represented as a Number.

You do not have to create a Number object to access this static property (use Number.EPSILON).

Property attributes of Number.EPSILON
Writable no
Enumerable no
Configurable no

Description

The EPSILON property has a value of approximately 2.2204460492503130808472633361816E-16, or 2-52.

Examples

Testing equality

x = 0.2;
y = 0.3;
z = 0.1;
equal = (Math.abs(x - y + z) < Number.EPSILON);

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.EPSILON' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Number.EPSILON' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 25.0 (25.0) No support (Yes) No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support 25.0 (25.0) No support No support No support

See also

  • The Number object it belongs to.

Document Tags and Contributors

 Contributors to this page: fscholz, pbakondy, adria, Mingun, realityking, jstraw, paulbartrum, teoli
 Last updated by: fscholz,