excel vba column letter to number
Sub Test()
Debug.Print "result: " & getColIndex("DD") ' --> result: 108
End Sub
Function getColIndex(sColRef As String) As Long
Dim i As Long, sum As Long, iRefLen As Long
sum = 0: iRefLen = Len(sColRef)
For i = iRefLen To 1 Step -1
sum = sum + Base26(Mid(sColRef, i)) * 26 ^ (iRefLen - i)
Next
getColIndex = sum
End Function
Private Function Base26(sLetter As String) As Long
Base26 = Asc(UCase(sLetter)) - 64 'fixed
End Function