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

[Guest]

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?

 

[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)

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?

 

[Don Guillett]

try
=SUM(OFFSET(G1,0,-12,1,12))

 

[Don Guillett]

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

 

[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)

 

[Guest]

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

 

[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)