Bruce
So close - try swapping the IF and the SUM:

{=SUM(IF(CT2:CW300)=0,SUM(CW2:DH300),0)}

cheers
Simon

"Bruce" wrote:

In the following formaula i am essentually summing a range if another range
in the same row = zero

=IF(SUM(CT2:CW2)=0,SUM(CW2:DH2),0)

My worksheet fill this down to row 300 and I total this at the the top,
however I am not really after the detail of each row but ratherjust the total
as I am going to roll the formula and the detail will add too many columns to
my sheet.

How do I modify the above as an array formula so that it inspect and total
for rows 2 to 300.

I have this but its does not work;

{=IF(SUM(CT2:CW300)=0,SUM(CW2:DH300),0)}

Bruce