# Excel TAN Function

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

**Description**

The Excel TAN function returns the tangent of a given angle. So you can use this function to calculate the tangent of an angle in radians. If you want to put an angle to TAN in degrees, you need to multiply the angle by PI()/180, then put the returned result into the TAN function. Or you can use the RADIANS function to combine with the TAN function.

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

The TAN 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 TAN function is as below:

=TAN (number)

Where the TAN function argument is:

- number -This is a required argument. A numeric value that used to calculate the tangent of an angle in radians.

** Note:**

- If your argument is in degrees, multiply it by PI()/180 or use the RADIANS function to convert it to radians.

** Excel TAN Function Examples**

The below examples will show you how to use Excel TAN Function to return the tangent of an angle in radians.

**1#** get the tangent of 0.55 radians, enter the following formula in Cell B1.

=TAN(0.55)

**2#** get the tangent of 39 degrees, use the below formula in Cell B2

=TAN(39*PI()/180)

Or you can use the RADINANS function to convert the angle to radians, then pass the returned value into TAN function to achieve the same result. Type the following formula in Cell B3:

=TAN(RADIANS(39))

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