However, if column C is empty; ignore that row in the computation. Thanks
for your input.

"David Biddulph" wrote:

33% look like the correct answer to me. One row satisfies the condition for
column C; all three rows satisfy the condition for column M; one divided by
3 equals 33%.
--
David Biddulph

"Rene" wrote in message
...
This formula works except when a different column has data in it.
SUMPRODUCT(--(M2:M10="b"),--(C2:C10<100),--(C2:C1050))/COUNTIF(M2:M10,"b")
c d m
75 b
200 b
25 b


It returns 33% instead of 50%