I think it can be done more elegantly but this works
=AVERAGE(OFFSET(A1:A1,COUNT(A1:A5000)-6,0):OFFSET(A1:A1,COUNT(A1:A5000)-1,0))

I am assuming you will not go passed A5000

best wishes

--
Bernard Liengme
www.stfx.ca/people/bliengme
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"keving" wrote in message
...
I am sure there is a simple way!
each week I insert a number in a column, thus after 6 weeks I have A1:A6
filled in. Each week I need to take the average of the last 4 numbers. How
can I calculate this automatically without having to change the range each
time?
from Kevin