SUMIF

[jeremy via OfficeKB.com]

I'm trying to sum column two, if column one
meets condition....

weeks tons
2 6.8
6 23.7
7 28.6
4 36.2
8 24.2
8 24.2
6 26.4
6 12.2
2 23.5

IF column 1 =2, sum column 2......

 

[Chip Pearson]

Use the SUMIF function. E.g.,

=SUMIF(A1:A10,8,B1:B10)

 

[RagDyer]

You can "hard code" the "2" into the formula itself:

=SUMIF(A2:A10,2,B2:B10)

OR
You could assign a cell to contain the number to match, so that you could
easily change it without having to change the formula itself:

=SUMIF(A2:A10,C1,B2:B10)

With C1 designated as the cell to contain the number to match.
--
HTH,

RD
==============================================
Please keep all correspondence within the Group, so all may benefit!
==============================================