Hi!

One way:

Assume data is in column A, A1:An.

Enter this formula in B1:

=AVERAGE(OFFSET(A$1,(ROWS($1:1)-1)*12,,12))

Copy down as needed.

The results will be like this:

B1 = AVERAGE(A1:A12)
B2 = AVERAGE(A13:A24)
B3 = AVERAGE(A25:A36)
B4 = AVERAGE(A37:A48)
etc

Biff

"Danny" wrote in message
...
I have a column of numbers for which i need to average every 12 rows(i.e
average rows 1-12, 13-24, 25-36, etc). It is two years worth of data (730
days) with 12 entries per day. I need the average daily readings for each
day.

Is there a simple and efficient method to copy and paste the same formula
for all 730 days. I know I can use the average function for each range,
but
that is a lot of typing!

Thanks in advance!

Danny