How to create custom functions in Visual Basic

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Marie-Ange Demory

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Today we all want to always be better at what we like and to give our personal touch to what we do. And this is not an exception when using Excel , since, as this is a platform with too many tools to use, we want to get the most out of it by customizing it.

That's why custom Visual Basic functions like creating your own macro code with quick access and use UDF user-defined functions so quick and easy, so you can perform any operation you want, without limits.

How to Create Custom Functions in Visual Basic | UDF user-defined functions

What are custom functions in Visual Basic?

These custom functions called "User Defined Functions", or UDF for its acronym in English (User Defined Functions), are those that allow using the functions, properties and methods of VBA, which help some custom aspects of Excel.

The more than 300 functions that this mode allows to use are really useful to customize our Excel as we want, making it unique and different from others.

Since Office developers cannot fully predict all the operations that users will have to perform, custom functions in Visual Basic allow us to add the mathematical operations we need to our Excel.

How to create custom functions in Visual Basic User Defined UDF?

Surely you are wondering how to enjoy all these useful functions in your Excel, well, here we show you how.

The steps to achieve this are not complicated at all, contrary to what some people think. Indeed, they are really simple .

All you need to do to create custom UDF user-defined functions in Visual Basic is:

  • First, you need to set up what you want to do with these custom functions.
  • Go to the form or table where you want to set the already scheduled task.
  • Once there, press Alt + F11 to bring up the editor of Visual Basic .
  • From the options that will appear, click "Insert" and then "Module".
  • You will see a new module window appear on the right side of the aforementioned editor, the Visual Basic one.
  • Finally, we will only have to use the function in the form of Excel code and the operation you want to perform in the newly created module can begin to do its duty.
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That's all! After following all the simple steps previous, you will be able to use the special function you want so badly.

Some things to keep in mind are that if you have a Mac computer, you should press End + Alt + F11, instead of just Alt + F11.

You should also remember that, if you have the 2007 version of Excel, the maximum character capacity to enter in these forms is 255. And if you have a version from previous years, it is only 30 characters.

Likewise, if you need further assistance, we recommend that you visit the Help for Office section on Microsoft's official website and thus get more of the options offered by Excel.

What rules should you follow when creating custom functions in Visual Basic?

For every new feature that is made available to us these days, there are a number of rules that must be followed for use them correctly . And in Excel this law is not forgotten, since, when creating custom functions, we have to follow certain rules.

For example, something you shouldn't forget is that custom functions should always start with a "Function" statement and end with a statement "In Function" . Also, you should always put a statement somewhere that gives a value to a variable with the same name as the function.

Something that can help you improve the organization of your Excel rows is knowing how to create and apply a custom table style in Excel, so that adapt to your needs .

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