Try something like

=IF(Q8="","",SUM(Q8*Insetllingen!B16*Instellingen! Q3))


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Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com






"sebasjuh " wrote in
message ...
I am working with excel (one of the first time I use excel :D)
but I
have a problem.

I have this formula:
=SOM(Q8*Instellingen!B16*Instellingen!Q3)

But when you leave the field blank in Q8, you see in the field
where
this formula is a -

How do I change the formula to see nothing in that field???

(i hope you guys understand it a little bit)


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