Count Formula Problem

[Guest]

Using the example below, I need a worksheet formula that will automatically
determine the number of blank cells in column B based on the number of rows
in Col A containing entries, which can vary as more entries are added after
the last row. So the formula needs to automatically determine that number of
rows in column A for the whole column, not just a select number of rows. In
this example the number of rows is 5. Fortunately, the first null entry in
Col A will indicate the end of the data in that column. So there are no
nulls in Col A before the last entry. In my example, the answer is 3 (for
nulls found in Col B rows 2, 3 and 5). Any ideas? Thanks in advance.

Col A Col B
Row 1 10 X
Row 2 20
Row 3 25
Row 4 100 x
Row 5 15

 

[daddylonglegs]

Perhaps try

=COUNTBLANK(B1:INDEX(B:B,COUNTA(A:A)))

 

[Bob Phillips]

=sumproduct(--(A1:A100<>""),--(B1:B100=""))

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HTH

Bob Phillips

(remove nothere from email address if mailing direct)

 

[Peo Sjoblom]

=SUMPRODUCT(--(A2:A10<>""),--(B2:B10=""))

if you really want to determine the numbers of entries in A you would need a
dynamic formula like

http://www.contextures.com/xlNames01.html#Dynamic

however just use a a range that is a bit bigger than what can ever be there
the formula will still work


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Regards,

Peo Sjoblom

http://nwexcelsolutions.com