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The Number.POSITIVE_INFINITY property represents the positive Infinity value.

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


The value of Number.POSITIVE_INFINITY is the same as the value of the global object's Infinity property.

This value behaves slightly differently than mathematical infinity:

  • Any positive value, including POSITIVE_INFINITY, multiplied by POSITIVE_INFINITY is POSITIVE_INFINITY.
  • Any negative value, including NEGATIVE_INFINITY, multiplied by POSITIVE_INFINITY is NEGATIVE_INFINITY.
  • Any positive number divided by POSITIVE_INFINITY is positive Zero.
  • Any negative number divided by POSITIVE_INFINITY is negative Zero.
  • Zero multiplied by POSITIVE_INFINITY is NaN.
  • NaN multiplied by POSITIVE_INFINITY is NaN.
  • POSITIVE_INFINITY, divided by any negative value except NEGATIVE_INFINITY, is NEGATIVE_INFINITY.
  • POSITIVE_INFINITY, divided by any positive value except POSITIVE_INFINITY, is POSITIVE_INFINITY.

You might use the Number.POSITIVE_INFINITY property to indicate an error condition that returns a finite number in case of success. Note, however, that isFinite would be more appropriate in such a case.

Because POSITIVE_INFINITY is a static property of Number, you always use it as Number.POSITIVE_INFINITY, rather than as a property of a Number object you created. 



In the following example, the variable bigNumber is assigned a value that is larger than the maximum value. When the if statement executes, bigNumber has the value Infinity, so bigNumber is set to a more manageable value before continuing.

var bigNumber = Number.MAX_VALUE * 2;

if (bigNumber == Number.POSITIVE_INFINITY) {
  bigNumber = returnFinite();


Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262)
The definition of 'Number.POSITIVE_INFINITY' in that specification.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.POSITIVE_INFINITY' in that specification.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Number.POSITIVE_INFINITY' in that specification.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
POSITIVE_INFINITYChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes


Full support  
Full support

See also

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