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    This is an experimental technology, part of the ECMAScript 6 (Harmony) proposal.
    Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.


    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


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


    Example: Testing equality

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


    Specification Status Comment
    ECMAScript 6 (ECMA-262)
    The definition of 'Number.EPSILON' in that specification.
    Release Candidate Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) 25.0 (25.0) Not supported (Yes) Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported Not supported 25.0 (25.0) Not supported Not supported Not supported

    See also

    • The Number object it belongs to.

    Document Tags and Contributors

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