=sumproduct(--(a1:a20="W"),--(b1:b20=1))

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

Byron720 wrote:

I have the following data (sample):

w 1
w 1
w 2
w 1
w 1
c 3
w 2
c 1
c 1
w 3
c 1

I need a formula that calculates how many of the w's are 1

--

Dave Peterson