Hi, I am baking a french chocolate cake in a 10 inch round form and I am wondering how many I should do. The bottoms are pretty thick but I cut them in half and put caramel in between and then buttercrem on top. Do you think 7 will be enough? 

How high will they end up?  If they are 3 inches high or more a 10 inch round will serve 38 according to the standard Wilton chart.  7 would give you 266 servings, way more than enough. 
 

I would think so.

A 10" round "DOUBLE" cake serves 42 wedding servings.   A 10" round "SINGLE" serves 20.    Depends on if you want double layers....or single layers.    I recommend splitting and filling either choice.    It sounds like you are doing single layers.  7 will work. 

Hi, no the cake itself is around 5 cm or 1.96 inches and then I add caramel inbetween and buttercream on top (the cake itself is a rosette cake). So how many do you think would be enough :)

O.k. thank you so much, yes I am baking a single layer thick cake or around 5 cm or 2 inches and taking it apart and putting caramel in between. So I think 7 will be the magic number for me. This is also a very chocolate cake so people don't have as big slices as with maybe other cakes as it is quite heavy. Thanks for the help