=SUMPRODUCT((A1:A8<"")/COUNTIF(A1:A8,A1:A8&""))

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HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"pgiessler" wrote in message
...
I have a list of Purchase Orders Codes (alpha-numeric data) and I want to
know how many different POs are being hit in a list of monthly purchases.
For
example:

EV134
SD234
EV134
WD686
WD686
EV134
SD234
HK128

So, the answer I would be looking for is 4. Is there a easy way to do
this?
I have a formula that calculates this with numbers, but the text seems to
mess it up.

Any help would be appreciated - Thanks - P