Convert between degrees and radians in JavaScript

Degrees to radians

JavaScript's Math.PI constant can be used to convert an angle from degrees to radians. The conversion formula is radians = degrees * Math.PI / 180.0.

r = \frac{d \times \pi}{180}

const degreesToRads = deg => (deg * Math.PI) / 180.0;

degreesToRads(90.0); // ~1.5708

Radians to degrees

Conversely, the conversion formula from radians to degrees is degrees = radians * 180.0 / Math.PI.

d = \frac{r \times 180}{\pi}

const radsToDegrees = rad => (rad * 180.0) / Math.PI;

radsToDegrees(Math.PI / 2); // 90