Calculating the number of unique values with a range

[SiH23]

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.

 

[Pecoflyer]

Chip Pearson has got 'an answer
(http://www.cpearson.com/excel/Duplicates.aspx) for yo

 

[muddan madhu]

try this

=SUM(1/COUNTIF(B2:B65636,B2:B65636)) ( array function use Ctrl +
Shift + Enter )

 

[Pecoflyer]

Formula which will not take blanks into account

 

[T. Valko]

See your other post

 

[T. Valko]

Have you ever tried that formula on that big of a range, and if so, how long
did it take to calculate (if it ever did!) ?

--
Biff
Microsoft Excel MVP


try this

=SUM(1/COUNTIF(B2:B65636,B2:B65636)) ( array function use Ctrl +
Shift + Enter )