JavaScript - convert radians to degrees (rad to deg)

In this article, we're going to have a look at how to convert radians to degrees 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 radToDeg(rad) {
    return rad * (180.0 / Math.PI);
}


// Usage example:

console.log( radToDeg( 0           ) );  //   0.0 degrees
console.log( radToDeg( Math.PI / 2 ) );  //  90.0 degrees
console.log( radToDeg( Math.PI     ) );  // 180.0 degrees

console.log( radToDeg( 3.141592653589793 / 6   ) );  // ~30 degrees
console.log( radToDeg( 3.141592653589793 / 4   ) );  //  45 degrees
console.log( radToDeg( 3.141592653589793 / 2   ) );  //  90 degrees
console.log( radToDeg( 3.141592653589793       ) );  // 180 degrees
console.log( radToDeg( 3.141592653589793 * 1.5 ) );  // 270 degrees
console.log( radToDeg( 3.141592653589793 * 2   ) );  // 360 degrees

See also

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

Merged questions

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