Count unique, non-hidden cells only

[cview]

I have a column with names of products, some of which appear multiple times. As I apply filters in other columns to my data, I want to be able to count the number of unique, non-hidden names that remain with a formula. Is there any way to do this so that the number of unique non-hidden names updates itself each time I change the filter settings?

Thank you! I'm a first-time poster, though I've used existing threads in the past for help. Any help would be greatly apprecited.

 

[Gary's Student]

Say we have data in column A from A2 thru A100 and the data is filtered. To count the visible uniques in column A, use:

=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))

This is an array formula that must be entered with CNTRL-SHFT-ENTER rather than just the ENTER key

 

[cview]

Thank you!