# How to Use Excel ATAN Function?

Microsoft Excel is a powerful data visualization and analysis program used all around the world. It uses spreadsheets to store, organize, or perform operations with formulas and functions. This application is developed for WindowsMacAndroid, and iOS. If you want to get the inverse tangent of numbers, then you can use the ATAN function.

Here, we will see how to use the Excel ATAN Function with its syntax, explanation, and examples. Get an official version of MS Excel from the following link:

https://www.microsoft.com/en-in/microsoft-365/excel

## Explanation of ATAN Function

• It is one of the built-in functions in Microsoft Excel.
• This function returns the inverse tangent of a given number in radians.
• The output radian value lies between the (-∞ to ∞) to the corresponding input value.
• For example, ATAN(5) returns the output value as 1.373

## Syntax

• Here, you will see the syntax of the ATAN function.
• To apply this function on your spreadsheet, you have to select a cell and enter the formula in the following format.
• Once you enter the formula, just click on the button to get the result.

=ATAN(number)

Parameter Description

Number – The input value to get the inverse tangent number.

Note:
If the argument is a non-numeric value (letters or special characters) and then it will return #VALUE! Error.

## Practical Examples

Here, we come up with some examples to know how to use the ATAN function in the Excel spreadsheet.

• Initially, you have to open your Excel workbook on your PC and launch the worksheet that has data.
• For instance, we have given the input values in Column B and we will get the corresponding inverse tangent values in Column D.
• Then, you have to enter the formula in the cell as shown below to get the result.
• After entering the formula, you need to click the to get the output, as shown below. You can drag down the cell to fill the remaining cells.

## Input that Causes Error

• If the argument is a non-numeric value (letters or special characters) and then it will return #VALUE! Error.