# Excel UDF not calculated? Here's how to fix it Software Keeps (2023)

Having trouble using Excel user-defined functions? Check out our guide for FAQs and solutions to keep your formulas running smoothly.

Troubleshoot an Excel user-defined function not working?

I hear korositeExcel, you may have heard of user-defined functions and custom types created to perform specific tasks. but when yourExcel user-defined function does not work, don't you understand why?

Don't worry, we're here to help!

In this article, we'll explore some common reasons why Excel user-defined functions might not work and provide real-world solutions to help you resolve the issue.

Whether you're a student trying to do your math or a professional working in Excel, read on to learn how to solve your problemExcel user-defined function does not work!

## What is a user-defined function and why is it so?

User-defined functions (UDFs) are custom functions that allow you to perform calculations tailored to your needs.

Basically, you write a small piece of code in VBA (Visual Basic for Applications) that tells Excel how to handle your custom calculations. The best part; You can enter a variety of information, including:

• number
• text
• datum
• Boolean value
• series

The output can be anything from a single value to an entire range of values.

but here's the problem: When updating a workbook, Excel will recalculate only the formulas associated with the changed cells. Because Excel cannot validate the VBA code behind the custom function, it may not know which cells also affect the result of the custom function.

So if you're not seeing the correct output of your custom function, it's probably because Excel didn't update it automatically.

Fortunately, there are a few things you can do to make sure your UDFs work properly. By understanding how Excel handles custom functions, you can debug and fix any problems you encounter and get your calculations back on track.

### Volatile and Immutable Custom Functions in Excel

Custom functions are a powerful tool in Excel that allow you to create your own formulas to perform various calculations. But did you know that not all custom features are created equal? some are"Volatile, while others are "non-volatile

What does this mean: ONEpermanent custom functionIt only recalculates when the value of the cell it uses changes. So if you create a custom function that outputs the workbook name, as in our example, it will only be updated if you change something in the workbook that affects the function's output.

For example: If you change the name of the workbook, the function will not update automatically and will keep the old name.

This can be frustrating if you use custom functions to display dynamic information such as the current date or time. In these cases you must useCustom "flying" functions., recalculates every time Excel starts, even if the input value hasn't changed. This way you can ensure that your features are always up to date.

Custom functions are a powerful tool for Excel users at all levels, and understanding the difference between variable and non-constant functions can help you create more efficient and reliable formulas.

### Why custom functions may not appear in Excel drop-down lists

Have you ever tried to use a custom function in Excel, only to find that it doesn't appear in the drop-down list like a standard function? It can be frustrating, but there are some common mistakes that can cause it:

1. If you are using Excel 2003-2007, you will not see custom functions in the drop-down list. Custom features are only available in newer versionsExcel version.

2. Custom functions must be written in standard VBA units called modules. When you create a new module to write functional code, a Modules folder is automatically created to store all modules.
3. Sometimes new modules are not created and the custom module code ends up in the wrong place, such as in a worksheet or workbook code area. As a result, the feature will not work or appear in the dropdown menu.

So if you want to use custom Excel functions, always put the code in the Modules folder. This will ensure that your custom functions work as expected and are easily accessible from the dropdown menu.

### User-defined functions are not enabled

To use user-defined functions (UDFs) in Excel, you must first enable the Developer tab on the ribbon.

Do this:

1. Discover Excel Options

2. custom ribbon

3. Select the developer box on the right

Once you enable this option, you will see a Developer tab appear in the ribbon where you can start creating and using your own custom functions.

### Additional steps to verify that your UDF works

In this list, we'll look at ten different things to check when your UDF isn't working:

1. check for errors: Before using a UDF, carefully check for errors that prevent it from working. Even a small typo can cause an operation to fail.

2. Make sure the function is saved in the correct location: Make sure the function is saved in the correct folder and format. If it is not saved correctly, Excel will not be able to recognize and use it.
3. Make sure it is enabled in Excel: If UDF is not enabled in Excel, it will not work. You can enable this by going to Excel Options and checking the "Developer" box.

4. Make sure the function name is correct: Check that the function name is spelled correctly and matches the name used in the formula. Any deviation may cause the operation to fail.
5. Check if the function requires a specific input parameter: If the function requires specific input parameters, make sure the data you are using is in the required format. Otherwise, the function will not work properly.
6. Check if the feature is compatible with your version of Excel: Some UDFs may not be compatible with some versions of Excel. Please check compatibility before using this feature.
7. Check the function for invalid arguments: Ensures that the function uses valid parameters that Excel recognizes. Invalid arguments cause the function to fail.
8. Make sure the function has the correct return value: If the function returns an incorrect value, double-check the function code to make sure it returns the correct value.
9. Check for circular references in formulas: A circular reference will cause the operation to fail. Check for circular references in the formula and resolve them before using the function.
10. Make sure the feature is not blocked by anti-virus software: Some anti-virus software may prevent the use of UDFs. Check your antivirus settings and add exceptions if necessary.

### How to do a UDF recalculation in Excel?

Excel can recalculate user-defined functions (UDFs) using a simple keyboard shortcut. accordingCtrl + Alt + F9Forces all functions in the worksheet to be recalculated.

It is important to note that your UDF must be marked as "volatile" to work properly. When a function is marked as a variable, it is automatically recalculated when cells are recalculated or when the workbook is changed.

Recalculating your UDFs is necessary to keep your calculations accurate and up to date. This is especially important when dealing with large amounts of data and complex formulas.

Without proper recalculation, you may experience errors in your calculations that could have significant consequences.

Using the Ctrl + Alt + F9 shortcut, you can easily force Excel to recalculate your UDF and ensure that your calculations are correct.

## final thoughts

There are several reasons why user-defined functions in Excel might not work. These may include syntax errors, incorrect function locations or names, incompatible input parameters or versions of Excel, circular references, and blocked antivirus software.

To ensure your custom features work properly, be sure to review these common issues and follow the suggested solutions. With proper setup and troubleshooting, user-defined functions can provide a valuable tool for your Excel calculations.

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