In this article, we're going to have a look at how to convertĀ degrees toĀ radians using JavaScript. In JavaScript there is no built-in conversion method. It is necessary to write own one.

Conversion can be made with following formula:

Simple implementaion is presented below.

## 1. Custom conversion method example

```
// ONLINE-RUNNER:browser;
function degToRad(deg) {
return deg* (Math.PI / 180.0);
}
// Usage example:
console.log( degToRad( 0.0 ) ); // 0 0.0 radians
console.log( degToRad( 90.0 ) ); // 1.5707963267948966 ~Math.PI / 2 radians
console.log( degToRad( 180.0 ) ); // 3.141592653589793 ~Math.PI radians
console.log( degToRad( 30 ) ); // 0.5235987755982988 ~Math.PI / 6 radians
console.log( degToRad( 45 ) ); // 0.7853981633974483 ~Math.PI / 4 radians
console.log( degToRad( 90 ) ); // 1.5707963267948966 ~Math.PI / 2 radians
console.log( degToRad( 180 ) ); // 3.141592653589793 ~Math.PI radians
console.log( degToRad( 270 ) ); // 4.71238898038469 ~3 * Math.PI / 2 radians
console.log( degToRad( 360 ) ); // 6.283185307179586 ~2 * Math.PI radians
```