Try one of these...

This is an array formula** :

=AVERAGE(IF(ISNUMBER(C1:C3),C1:C3))

** array formulas need to be entered using the key combination of
CTRL,SHIFT,ENTER (not just ENTER)

Or this normally entered formula:

=SUMIF(C1:C3,"<#VALUE!")/COUNT(C1:C3)

This formula will only work if the errors are of the #VALUE! type.

--
Biff
Microsoft Excel MVP


"ericaamousseau" wrote in message
...
I am making a spreadsheet in excel that will add subtract times and then
average the totals of multiples of these. My problem is that some of the
tiems do not need to be entered causing a # VALUE! in teh line where my
subtraction formula. This is fine and needs to stay this way. My problem
is
that the average then has a #VALUE! instead of an average. How do I skip
over cells that have the #VALUE! ? I ammaking htis spreadsheet for
someone
else, so I can not correct it each time this happens. This is what my
sheet
is like:
A B C
1 1:15 1:30 15 =(B1-A1)*1440
2 12:30 1:00 30 =(B2-A2)*1440
3 3:15 N/A #VALUE! =(B3-A3)*1440
4 #VALUE! =AVERAGE(C1:C3)

Any suggestions to get the average to actaully average the amounts that
are
not #VALUE! ??? Any help would be fantastic!!