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    Math.PI

    Summary

    The Math.PI property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:

    Math.PI=π3.14159\mathtt{\mi{Math.PI}} = \pi \approx 3.14159

    Property attributes of Math.PI
    Writable no
    Enumerable no
    Configurable no

    Description

    Because PI is a static property of Math, you always use it as Math.PI, rather than as a property of a Math object you created (Math is not a constructor).

    Examples

    Example: Using Math.PI

    The following function uses Math.PI to calculate the circumference of a circle with a passed radius.

    function calculateCircumference(radius) {
      return 2 * Math.PI * radius;
    }
    
    calculateCircumference(1);  // 6.283185307179586
    

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Standard Initial definition. Implemented in JavaScript 1.0.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Math.PI' in that specification.
    Standard  
    ECMAScript 6 (ECMA-262)
    The definition of 'Math.PI' in that specification.
    Release Candidate  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Last updated by: Mingun,