How can I sum data on a row from certain named columns?

  • Thread starter Thread starter Guest
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Guest

I have a list of products on columns with the materials correspondence (on
rows). At each product I have more 2 columns that shows me how many of each
material I need for producing a number of products. The same material is used
by another product, so I need to sum the material needs only for the "Total"
named columns of each product. This means I have to sum every third column's
cell by row.
Can anyone give me some help?
 
Hi!

Assume you want to sum cells A1, D1, G1 and J1.

Since that's not a very big range I would just use:

=SUM(A1,D1,G1,J1)

If you have a larger range, every 3rd cell from A1 to BA1:

=SUMPRODUCT(--(MOD(COLUMN(A1:BA1),3)=1),A1:BA1)

Biff
 
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