JavaScript - convert degrees to radians (deg to rad)

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

Conversion can be made with the following formula:

A simple implementation is presented in the below.

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

See also

1. JavaScript - convert radians to degrees (rad to deg)

Merged questions

1. How to make conversion from radians to degrees in JavaScript?