Thanks Bob - did the trick.

"Bob Phillips" wrote:

=SUMPRODUCT(--(Costs!$F$12:$F$57=$B7),--(MONTH(Costs!$H$12:$H$57)=1),--(Costs!$H$12:$H$57<""),Costs!$J$12:$J$57)


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HTH

Bob


(there's no email, no snail mail, but somewhere should be gmail in my addy)



"John" wrote in message
...
Hi

I'm using the following sumproduct:
=SUMPRODUCT(--(Costs!$F$12:$F$57=$B7),--(MONTH(Costs!$H$12:$H$57)=1),Costs!$J$12:$J$57)

Costs!H12:H57 is a list of dates - on occassion this may be blank but
there
still be a value in the Costs!J12:J57 column. For some reason, if the date
field is blank then the value is included in the calculation (as though
there
was a January date in the date field).

I want it to ignore the value if the date field is blank - anyone got any
ideas? (I obviously have a column for each month (MONTH= 1 through 12))

Thanks