Try:

=SUMPRODUCT((A1:A20<"")*(O1:O20=""))

Adjust to you own ranges

--
HTH

Sandy
In Perth, the ancient capital of Scotland
and the crowning place of kings


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"TDW" wrote in message
...
How can I calculate the number of blank cells in Column O based on
information in Column A? By counting the number of blank cells I can
figure
how many apps. I still need to receive but I would like to do this per
month
(the months are listed in Column A) Any ideas?