## Excel ATAN Function

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

### Description

The Excel ATAN function returns the arctangent of a number. So this function can be used to calculates the arctangent of a supplied number. The returned angle is given in radians in the range –pi/2 to pi/2. Or the returned value is a numeric value.

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

The ATAN 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 ATAN function is as below:

`= ATAN (number)`

Where the ATAN function arguments is:

• number -This is a required argument. The tangent of the angle that you want to get.

Note:

• If you want to express the arctangent in degrees, you just need to multiply the result by 180/PI() or you can use the DEGREES function.
• If the supplied number is not a numeric value, the ATAN function will get the #VALUE！ Error。

### Excel ATAN Function Examples

The below examples will show you how to use Excel ATAN Function to return the arctangent for a given number.

1# get the arctangent of 2 in radians, pi/4, enter the following formula in Cell B1.

=ATAN(2) The returned result is 1.107149.

2# get the arctangent of 2 in degrees, using the following formula in Cell B2.

`=ATAN(2)* 180/PI()` This formula will return the value 63.43495.

Or you can use the below formula to achieve the same result:

`=DEGREES(ATAN(2))` ### Related Functions

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