This post will guide you how to use Excel ACOS function with syntax and examples in Microsoft excel.

Table of Contents

**Description**

The Excel ACOS function returns the arccosine value of a number.

The ACOS function is a build-in function in Microsoft Excel and it is categorized as a Math and Trigonometry Function.

The ACOS function is available in Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000, Excel 2011 for Mac.

**Syntax**

The syntax of the ACOS function is as below:

**= ACOS(number)**

**Where** the ACOS function argument is:

**Number – **This is a required argument. A number between -1 and 1 that you want the arccosine value.

**Example**

The below examples will show you how to use Excel ACOS function to return the arccosine value of a number.

**#1 =ACOS(B1)**

**Note:** the above formula will return the arccosine value of B1 cell.

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