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---
title: Math.PI
short-title: PI
slug: Web/JavaScript/Reference/Global_Objects/Math/PI
page-type: javascript-static-data-property
browser-compat: javascript.builtins.Math.PI
sidebar: jsref
---
The **`Math.PI`** static data property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159.
{{InteractiveExample("JavaScript Demo: Math.PI")}}
```js interactive-example
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
<!-- prettier-ignore-start -->
<math display="block">
<semantics><mrow><mi>๐ผ๐๐๐.๐ฟ๐ธ</mi><mo>=</mo><mi>ฯ</mi><mo>โ</mo><mn>3.14159</mn></mrow><annotation encoding="TeX">\mathtt{Math.PI} = \pi \approx 3.14159</annotation></semantics>
</math>
<!-- prettier-ignore-end -->
{{js_property_attributes(0, 0, 0)}}
## 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
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{jsxref("Math")}}
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