How to create custom functions in excel?


New Member
Jul 28, 2010
Hi everyone,

I'm a newbie in using Excel and VBA. I've made this VBAProject that uses a UserForm. The program accepts user inputs from the TextBoxes which are processed then displays the output unto another TextBox.

Now I'm planning to improve the functionality of my current VBAProject by having the program work in the actual worksheet. Instead of using TextBoxes, the program will get inputs directly from a cell / cell range of an Excel Worksheet and display the computed result in a specified cell where the program is called. Much like how predefined excel functions work, right? So, is it possible to create custom functions in Excel 2007 (like the =Sum(), =Avg())?

Hope you can help me out asap. TIA. :D

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New Member
Jul 28, 2010
Hi again everyone,

I have a new problem connected to the first one :D. So I've migrated my codes (global vars and sub procs) from the UserForm into the Module where I've created my UDF Add-in.

Previously, I have these Excel Worksheets (with data tables) that acts as a database for my VBAProject. I lookup values in these Worksheets so that I could perform the program's needed computations.

So we go to the problem. After saving the program as an Excel Add-In and after installation of the Add-In, I can no longer access / view the Worksheets that I've created (View Objects). In addition, when I debug the UDF Add-in, it terminates when ever it reaches statements having to do with calling Worksheet functions:

e.g. Range(varWorkSheetName + "!A4:A9").Find(valType, LookIn:=xlValues, LookAt:=xlWhole, MatchCase:=False)

In short, I can't run my Add-In :D. So how do I solve this? Hope you could help me out again asap. TIA
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