Excel count unique in range if

Question

What formula can be used to count unique values in column A if Column B is a value. i have seen many online but none of them seem to work when only using Column ranges , the dat

Answer 1

If your data are in A1:B18, and criteria1 is in C1, try:

{=SUM(IF(FREQUENCY(IF(A1:A18<>"", IF(B1:B18=C1, MATCH(A1:A18, A1:A18, 0))), ROW(A1:A18)-ROW(A1)+1), 1))}

Expanded:

{=SUM(
    IF(
        FREQUENCY(
            IF(A1:A18<>"", 
                IF(B1:B18=C1, 
                    MATCH(A1:A18, A1:A18, 0)
                )
            ), 
            ROW(A1:A18)-ROW(A1)+1
        ), 
    1)
)}

Enter as an array formula with CtrlShiftEnter