Hi,

I can't make that formula misbehave, it looks fine to me can you give the
precise circumstances under which you get an error.

Mike

"Phil_S" wrote:

I have a worksheet in which I am tring to sum the data based upon a code
range, a date range and cost range. However when I enter this formula it sums
the data from blank cells into the cell i wish to sum all the costs for
January.

=SUMPRODUCT(--($B$2:$B$268=$U277),--(MONTH($D$2:$D$268)=8),($K$2:$K$268))

Is there any way around this?