=SUMPRODUCT(--(HOUR(A2:A200)=6),B2:B200)

perhaps?

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"Josh - Westfield Australia" <doinitsideways@hotmaildotcom wrote in message
...
Need to find average volume per hour to display in a graph. Input
information
is time supplied amount supplied and total supplied
ie
Truck # - Time Loaded - Amount Loaded - Total Amount
1 - 6:00 - 6 - 6
2 - 6:03 - 6 - 12
3 - 6:05 - 10 - 22
etc
etc.