Excel VBA : How to debug a user defined function (UDF)

The best way to debug a user defined function (UDF) is by writing a temporary Sub procedure that calls your function and then step into the Sub procedure by pressing F8 key.

Example :

Function grade(score As Single, score1 As Single) As String
         If score >= 75 And score1 >= 75 Then
         grade = "A"
         ElseIf score > 50 And score1 > 50 Then
         grade = "B"
         grade = "C"
         End If
End Function
Temporary Sub Procedure -

Sub test()
MsgBox grade(Range("A2").Value, Range("B2").Value)
End Sub

Next Step : Position your cursor before Sub test() and then press F8 key to step into the Sub Procedure.
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Deepanshu founded ListenData with a simple objective - Make analytics easy to understand and follow. He has over 10 years of experience in data science. During his tenure, he has worked with global clients in various domains like Banking, Insurance, Private Equity, Telecom and Human Resource.

4 Responses to "Excel VBA : How to debug a user defined function (UDF)"
  1. Perfect and simple solution. Thanks. Gary

  2. Thanks - this was helpful!

  3. Stepping into my function as described works, but calling it from the spreadsheet throws a #Name? error. Confused on why it would work if I step into it but not when I call it from a cell?


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