Sum rows in groups

S

sandy

I have a column with 10,000 rows of numbers. I need to sum a1:a5, a6:a10,
a11:a15, and so on in groups of five, for all 10,000 rows. How can I do
this? Thanks much.
 
D

Duke Carey

=SUM(OFFSET(A1,5*ROW(A1)-1,0,5,1))

Put that in the first cell where you want the sums to start and copy it down
the column.
 
S

sandy

Can't get it Duke. The first sum is incorrect and the next formula down
starts with the next number copied down to (a2, a3, a4). What am I doing
wrong? Thanks for your help. Sandy
 
D

Domenic

sandy said:
I have a column with 10,000 rows of numbers. I need to sum a1:a5, a6:a10,
a11:a15, and so on in groups of five, for all 10,000 rows. How can I do
this? Thanks much.
Click to expand...

Try...

B1, copied down:

=SUM(OFFSET($A$1,(ROW()-ROW($B$1)+1)*5-5,0,5))

Hope this helps!
 
B

Bob Phillips

Sandy,

Try this instead

=SUM(OFFSET(A$1,5*(ROW(A1)-1),0,5,1))

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
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