If you're using xl2007, take a look at =sumifs() in excel's help.

In xl2003 and below:

=sumproduct(--(a1:a10="something"),--(b1:b10="another"),C1:c10)

Adjust the ranges to match--but you can't use whole columns (except in xl2007).

=sumproduct() likes to work with numbers. The -- stuff changes trues and falses
to 1's and 0's.

Bob Phillips explains =sumproduct() in much more detail he
http://www.xldynamic.com/source/xld.SUMPRODUCT.html

And J.E. McGimpsey has some notes at:
http://mcgimpsey.com/excel/formulae/doubleneg.html

Lorenzo wrote:

I would like to sum a column only if meets the criteria of one and another
column.
what formula should i be using? i was using sumif but this is for the
criteria of one column.

--

Dave Peterson