Refresh Excel VBA Function Results

Question

How can I get a user-defined function to re-evaluate itself based on changed data in the spreadsheet?

I tried F9 and Shift

Answer 1

If you include ALL references to the spreadsheet data in the UDF parameter list, Excel will recalculate your function whenever the referenced data changes:

Public Function doubleMe(d As Variant)
    doubleMe = d * 2
End Function

You can also use Application.Volatile, but this has the disadvantage of making your UDF always recalculate - even when it does not need to because the referenced data has not changed.

Public Function doubleMe()
    Application.Volatile
    doubleMe = Worksheets("Fred").Range("A1") * 2
End Function