Math.PI

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
Writableno
Enumerableno
Configurableno

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

undefined

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

See also