Math

`Math.PI`

Represents the ratio of the circumference of a circle to its diameter, approximately 3.14159

Syntax

JavaScript

Math.PI

Return Value

The number 3.141592653589793

Examples

Basic Usage

console.log(Math.PI); // 3.141592653589793

Practical Example

function circleArea(radius: number) {
  return Math.PI * radius ** 2;
}
console.log(circleArea(5).toFixed(2)); // '78.54'

Advanced Usage

function degreesToRadians(deg: number) {
  return deg * (Math.PI / 180);
}
console.log(degreesToRadians(180)); // ~3.14159

Understanding Math.PI

The Math.PI method in JavaScript represents the ratio of the circumference of a circle to its diameter, approximately 3.14159. It belongs to the Math object and is one of the most widely used methods for working with math values in modern JavaScript and TypeScript applications.

The method signature is Math.PI. When called, it returns the number 3.141592653589793. Understanding when and how to use PI() helps you write more expressive, readable code.

Common use cases for Math.PI include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like math-e, math-sin, math-cos, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Math.PI is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.