Try this if you can use 101 in your Excel version
=SUBTOTAL(101,A1:C1)
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Regards Ron de Bruin
http://www.rondebruin.nl/tips.htm
"DotK" wrote in message ...
If an "average" formula includes multiple columns, and those columns change
each month by hiding old months (at end) and adding new months (at beginning)
what can be done, by macro or in formula) to ignore the hidden columns?