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))

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