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# JavaScript - calculate cos in degrees

3
points

In this article, we would like to show you a simple example of how to calculate cos in degrees in __JavaScript__.

In order to use this example we just need to change the value of `deg`

variable to some other value (in degrees).

```
// ONLINE-RUNNER:browser;
function calculateCos(deg) {
var rad = (Math.PI / 180) * deg;
return Math.cos(rad);
}
var deg = 30;
var y = calculateCos(deg);
// cos(30 deg) = 0.8660254037844387
console.log('cos(' + deg + ' deg) = ' + y);
```

We can change `deg`

to other values.

Example of common calculations:

```
cos(0 deg) = 1
cos(30 deg) = 0.8660254037844387
cos(45 deg) = 0.7071067811865476
cos(60 deg) = 0.5000000000000001
cos(90 deg) = 6.123233995736766e-17
```

I've prepared a similar post but for calculation sin in degrees: