Try...

=SUM(IF(FREQUENCY(IF(SUBTOTAL(3,OFFSET(A2:A100,ROW (A2:A100)-ROW(A2),0,1))
,MATCH(A2:A100,A2:A100,0)),ROW(A2:A100)-ROW(A2)+1)0,1))

....confirmed with CONTROL+SHIFT+ENTER.

Hope this helps!

In article ,
SOS wrote:

Hi all,

I'd like to be able to count unique text entries in Column A and have
messed aroubd with the following formula:

=SUM(IF(FREQUENCY(IF(LEN(A2:A100)0,MATCH(A2:A100, A2:A100,0),""),
IF(LEN(A2:A100)0,MATCH(A2:A100,A2:A100,0),""))0, 1))

entered as an array formula and it works.

However I'd like to be able to apply that formula after I have filtered
the worksheet on another column.

Example:

Name Gender
John Male
John Male
Mary Female
Margaret Female

The above formula gives me the answer 3 (correctly). But when I filter
the sheet on "Gender" as Male I'd like the answer to show 1.

Does anyone know if this is possible?

Many thanks

Seamus