Math.PI

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

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

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

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• Math