Sorry. I didn't know that colum references are not allowed with array
formulas, and assumed that it had something to do with the way emtpy cells
are handled by sumproduct(), which is why then thought about doing a dynamic
range.

Yes, changing it to B1: B65000 does solve my problem.

Thanks

"RagDyeR" wrote:

I don't understand!

If you're willing to use B:B and C:C, why would you want/need a dynamic
range.

With Sumproduct and all array formulas, entire column references are not
allowed (XL07 will change this), so use:

B1:B65535
which is *1* cell short of the entire column.
--

Regards,

RD
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Please keep all correspondence within the Group, so all may benefit !
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"Ren" wrote in message
...
Hi,

I a few sets of data that would have varying rows, and I need to get the
summation of products of cullumn B*C. How should I do this in excel? using
sumproduct(B:B,C:C) gives me a num error. I want to be able to have this
dynamically updated, hence, I don't want to do this in a macro(unless a
macro
can be automatically executed).

Thanks