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---
title: Math.PI
slug: Web/JavaScript/Reference/Global_Objects/Math/PI
page-type: javascript-static-data-property
browser-compat: javascript.builtins.Math.PI
---
{{JSRef}}
The **`Math.PI`** static data property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159.
{{EmbedInteractiveExample("pages/js/math-pi.html")}}
## Value
<math display="block"><semantics><mrow><mi>𝙼𝚊𝚝𝚑.𝙿𝙸</mi><mo>=</mo><mi>π</mi><mo>≈</mo><mn>3.14159</mn></mrow><annotation encoding="TeX">\mathtt{\mi{Math.PI}} = \pi \approx 3.14159</annotation></semantics></math>
{{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")}}