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

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

console.log(Math.PI);
// Expected output: 3.141592653589793

console.log(calculateCircumference(10));
// Expected output: 62.83185307179586

Value

𝙼𝚊𝚝𝚑.𝙿𝙸=π≈3.14159\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.

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

calculateCircumference(1); // 6.283185307179586

Specifications

Specification

ECMAScript® 2027 Language Specification
# sec-math.pi

Browser compatibility

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This page was last modified on Jul 10, 2025 by MDN contributors.

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Standard built-in objects
Math
Static methods
Static properties
1. E
2. LN2
3. LN10
4. LOG2E
5. LOG10E
6. PI
7. SQRT1_2
8. SQRT2