Hi,

I don't think the formula you entered will work.

If there are no blank cells in the range you can use

=SUM(1/COUNTIF(B2:B65536,B2:B65536))

entered as an array; or without an array:

=SUMPRODUCT(1/COUNTIF(B2:B65536,B2:B65536))

These function are very slow when going against 65,000 row.

Here is one formula which takes blanks into account:

=SUM(1/(IF(COUNTIF(B2:B65536,B2:B65536)0,COUNTIF(B2:B655 36,B2:B65536),1)))-(COUNTBLANK(B2:B65536)0)

This is array entered. if you know there are blanks you can just replace
(COUNTBLANK(B2:B65536)0) with 1.

--
Thanks,
Shane Devenshire


"SiH23" wrote:

I would be most grateful if someone could offer me some help.

I need to count the number of unique values within a column range. The range
is between B2:B65536. Each value consists of a series of alpha and numerical
characters and there are blank cells within the range.

There will be around 30,000 plus entries.

I have used various formulas, but due to the vast number of rows of data
they crash.

An example of one of the formulas I used is below:

=SUMPRODUCT((1/COUNTIF(A1:A5,A1:A5&"")))

I am desperate for an answer but am confused as to how to do this? Any help
or assistance would be very much greatly appreciated.