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A to Z of Excel Functions: The ACOS Function

24 June 2016

Welcome back to our A to Z of Excel Functions.  Do you know about the ACOS function?  Let’s see if this function will come in handy for you

The ACOS Function

The ACOS function returns the arccosine, or inverse cosine, of a given number.

The arccosine is the angle whose cosine is number.  The returned angle is given in radians in the range 0 to pi.

The syntax is very simple even if the principle is a little tangential (get it?):


Please see my example below:

We’ll continue our A to Z of Excel Functions soon.  Keep checking back – there’s a new blog post every other business day.