Math.PI

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

Try it

Value

\mathtt{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

Using Math.PI

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

function calculateCircumference(radius) {
  return Math.PI * (radius + radius);
}

calculateCircumference(1); // 6.283185307179586

Specifications

Specification
ECMAScript Language Specification # sec-math.pi

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`PI`	1	12	1	3	1	18	4	10.1	1	1.0	4.4	1.0	0.10.0