Count Distinct Values Once/Count Repeated Entries Only One Time

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This UDF will count each entry in a Range, once.

The Code

Function Count_once(Count_range As Range) As Long

Dim strAddress As String
Dim lMaxRow As Long, lEndCol As Long, lStartCol As Long
Dim lColCount As Long
Dim lLoop As Long, lArrElement As Long
Dim lArray() As Long



    lMaxRow = Rows.Count

    lColCount = Count_range.Columns.Count

    lEndCol = Count_range.Columns(lColCount).Column

    ReDim lArray(lColCount)

    lStartCol = Count_range.Columns(1).Column

        For lLoop = lStartCol To lEndCol
            lArray(lArrElement) = Cells(lMaxRow, lLoop).End(xlUp).Row
            lArrElement = lArrElement + 1
        Next lLoop

        lMaxRow = WorksheetFunction.Max(lArray)

        strAddress = Range(Count_range.Cells(1, 1), _
            Cells(lMaxRow, lEndCol)).Address
    

        Count_once = Evaluate("sumproduct((" & strAddress & "<>"""")/" _
            & "countif(" & strAddress & "," & strAddress & "&""""))")-1

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.

=Count_once(A1:A10)

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