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Excel Function That Sums Every Nth Cell In a Specified Range

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This Custom Function will sum every nth row or cell in the specified range. How about a free Handy Excel Functions Add-in?

The Code

Function SumEveryNth2007(rRange As Range, lNth As Long, Optional SumEveryNthRow As Boolean) As Single
Dim rCell As Range
Dim strAddress As String

'''''''''''''''''''''''''''''''''''''''''
'Written by Ozgrid.com'''''''''''''''''''
'Sums every nth cell.
'If more than 1 column, summation order is left-to-right and top-to-bottom
'unless SumEveryNthRow=TRUE
'Function very inefficient, rRange should be as small as possible.
'Most efficient method is DSUM, shown here
'http://www.ozgrid.com/Excel/sum-every-2nd-nth-cell.htm
'''''''''''''''''''''''''''''''''''''''''
  On Error Resume Next
    If SumEveryNthRow = False Then
       With WorksheetFunction
               For Each rCell In rRange
                lStep = lStep + 1
                If lStep Mod lNth = 0 Then sTot = .Sum(rCell, sTot)
               Next rCell
        End With
    
        SumEveryNth2007 = sTot
    Else
        strAddress = rRange.Address
        SumEveryNth2007 = Evaluate("=SUMPRODUCT((MOD(ROW(" & strAddress & ")," & lNth & ")=0)*(" & strAddress & "))")
    End If

End Function

To use this UDF push Alt+F11 and go Insert>Module and paste in the code. Push Alt+Q and save. The Function will appear under "User Defined" in the Paste Function dialog box (Shift+F3). Use the Function in any cell as shown below.

=SumEveryNth2007($A$1:$A$10,2)
This would sum every 2nd cell in the range $A$1:$A$10

=SumEveryNth2007($A$1:$B$10,TRUE)
This would sum every 2nd row in the range $A$1:$B$10

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