# MS Excel: ATAN Function (WS)

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

## Description

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

## Syntax

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

```=ATAN(A1)
Result: -0.674740942

=ATAN(A2)
Result: 0

=ATAN(A3)
Result: 1.522640814

=ATAN(0.2)
Result: 0.19739556```

Source: www.tutorialspoint.com

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