Great! That works... but

When I enter the ranges for columns A,B,C I get an error because there are
blank cells in the range. Basically I have a running list of entries for each
row. I'd like to have it set up to compensate for data continuiosly being
added.

Ex: I currently have only 500 rows, I'm predicting that this sheet will grow
into the thousands.

Thanks for the quick response... bonus points!!

"Bob Phillips" wrote:

Do you mean

=SUMPRODUCT(--(MONTH(A1:A100=1),--(B1:B100=C1:C100),B1:B100)

--
HTH

Bob Phillips

(remove nothere from email address if mailing direct)

"Aaron Saulisberry" wrote in
message ...
I'm currently using the following formula to calculate certain cells in
the
range only if they match in two columns. It works fine for getting a grand
total.


=SUMPRODUCT(--Logbook!T3:T65536<""),--(Logbook!U3:U65536<""),Logbook!T3:T6
5536))

But I'd like to be able to break this down by month in the date column.

Ex:

A B C
3-Jan 15 30
5-Jan 8 8
3-Mar 13 19
9-Mar 5 5
7-Jul 10 10
2-Jul 6 4

The values in columns B & C must match in order to be accepted. I'm stuck
on
how to break it down by month only.

Not sure if this is important or not but not every row has a date or
figure.

As always, help is greatly apprreciated!