# How To Find Inverse Cosine Of A Number in Excel

Last Updated on May 2, 2024 by Roshan Parihar

To find the inverse cosine of the given number in Microsoft Excel, use the Excel ACOS() and pass a number as an argument.

You can get the inverse cosine output in radian as well as in degree. However, the default output of the Excel ACOS function value is in radian.

## How to Find Inverse Cosine of a Number in Radian in Excel Sheet?

If you want to find the inverse cosine of the given number, you have to pass the number as the argument of the function. Let us take an example of the number -1 to pass as the argument of the function.

Output

3.141593

The number gives the output as 3.141593 which is the numeric value of π. You can get π in Excel using the `PI()`. The same you can use to convert to the degree using the next example given below.

## Calculate Inverse Cosine in Degree with MS Excel

To calculate the output in degree, you have to multiply the default output of the function with `180/PI()`. You have to use the below-given method to perform the degree conversion.

Output

180

The above output shows that the degree is 180 after conversion.

## Don’t Use Arguments with Value Other Than -1 to 1

In many cases, you forget to use the argument value to use between -1 and 1. You will get the error message as given in the example below.

Output

#NUM!

The above example takes 5 as the argument of the function. It gives the error output as #NUM! which indicates that the argument is incorrect.