See this screencap:

http://img504.imageshack.us/img504/5203/sumpsr2.jpg

As you can see SUMPRODUCT does work even though the ranges referenced
include empty cells.

Each referenced range has to be the same size.

=SUMPRODUCT(--(B2:B20="A"),--(C2:C20="July"),D2:D20)

You can't do something like this:

=SUMPRODUCT(--(B2:B100="A"),--(C2:C50="July"),D2:D50)

Or this (unless you're using Excel 2007):

=SUMPRODUCT(--(B:B="A"),--(C:C="July"),D:D)

--
Biff
Microsoft Excel MVP


"Peanut" wrote in message
...
I'm having a hard time with my sumif/sumproduct formulas. From the data
below, if I enter the following formula:

=SUM(IF((B2:B7="A")*(C2:C7="July"),D2:D7)) CTRL + SHFT + ENTER

I get the answer of $150 - which is what I want. However, this table gets
bigger with every transaction and every month. If, in the previous
formula,
I try to include a bigger range than what actually has info in it, it
returns
#VALUE. I don't want to keep changing my formula each month. What can I
do
to include blank cells i.e. a range of A2:A100?

PS I tried Sumproduct as well and it produced the same results.

Product Customer Month Amount
Pizza A July $150
B July $200
C July $100
Drinks A August $300
B August $250
C August $50

Thanks
Peanut