MS Excel: ATAN Function (WS)

This Excel tutorial explains how to use the Excel ATAN function with syntax and examples.


The Microsoft Excel ATAN function returns the arctangent (in radians) of a number.


The syntax for the Microsoft Excel ATAN function is:

ATAN( number )

Parameters or Arguments

number is the tangent of the angle that you wish to find.

Applies To

The ATAN function can be used in the following versions of Microsoft Excel:

  • Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

Type of Excel Function

The ATAN function can be used in Microsoft Excel as the following type of function:

  • Worksheet function (WS)

Example (as Worksheet Function)

Let's look at some Excel ATAN function examples and explore how to use the ATAN function as a worksheet function in Microsoft Excel:

Microsoft Excel

Based on the spreadsheet above, the following Excel ATAN examples would return:

Result: -0.674740942

Result: 0

Result: 1.522640814

Result: 0.19739556