formula to sum the prior 12 cells regardless of added columns?

M

Mopechicken

I need to sum the preceding 12 cells in a row within excel - regardless of
the fact that some columns will be added in front of this cell with the
formula. I want the formula to "float" just not sure how to accomplish it?
 
B

Bob Phillips

=SUM(INDEX(1:1,1,COLUMN()-12):INDEX(1:1,1,COLUMN()-1))

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HTH

Bob Phillips

(replace xxxx in the email address with gmail if mailing direct)

Mopechicken said:
I need to sum the preceding 12 cells in a row within excel - regardless of
the fact that some columns will be added in front of this cell with the
formula. I want the formula to "float" just not sure how to accomplish
Click to expand...
it?
 
D

Don Guillett

the last number needs to be one MORE than the columns back
=SUM(OFFSET(G1,0,-3,1,4))
 
B

Bob Phillips

A bit more robust in case there aren't 12 cells before

=SUM(INDEX(1:1,1,MAX(1,COLUMN()-12)):INDEX(1:1,1,MAX(1,COLUMN()-1)))

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)
 
M

Mopechicken

Bob - this is perfect!
Thanks so much!!!
Not quite sure what the formula is saying - but it works perfectly!!!
 
B

Bob Phillips

I posted a more robust version just after, in case you start before column M
say.

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)
 
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