VBA Tips: Build an Excel Add-In. About Add-Ins An Excel Add-In is a file (usually with an .xla or .xll extension) that Excel can load when it starts up. The file contains code (VBA in the case of an .xla Add-In) that adds additional functionality to Excel, usually in the form of new functions. Add-Ins provide an excellent way of increasing the power of Excel and they are the ideal vehicle for distributing your custom functions.
Excel is shipped with a variety of Add-Ins ready for you to load and start using, and many third-party Add-Ins are available. This article shows you how to write a custom function using Excel VBA and how to save and install it as an Add-In. In the Excel tutorial Working Out a Person's Age - An Introduction to Nested IF Statements I showed how to use IF statements to calculate someone's age from their date of birth. If you are already comfortable with writing custom functions, you can go straight to the section explaining how to save your UDFs as an Add-In. Write the Function Step 2: Enter the Code.
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