From the XL help file "Count the number of unique values by using functions":

=SUM(IF(FREQUENCY(A2:A10,A2:A10)0,1))
Note that this needs to be entered as an array (use Ctrl+Shift+Enter)
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Best Regards,

Luke M
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"Byron720" wrote:

In a column I have hundreds of airway bills. I need to calculate how many
different numbers I have in that report. Not the total (I can go to the last
row for that) and not the frequency. For example:

9140266155
9182187486
9182187556
9182187556
9182187464
9182187464
9140266166
9140266166
9140266170
9140266170
9140266181

Here the formula here should give me 7 which is the number of different
AWB's there are.