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Number.EPSILON

The Number.EPSILON property represents the smallest positive value, ε, that satisfy the equation ε = ω^ε,where ω is the smallest infinite ordinal.

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)	9