Does anyone know how much fondant would be need to create drapes on the sides of a 6",10",and 14" cakes.They will be stacked, and the draping will go on the sides of all 3, with a few inches extra at the top and bottom.I'm trying to figure this out so I can give them a price.I already know how much I need to actually cover the cakes.This is just for the draping.Is there any way to figure this out, short of rolling some out onto a dummy?

I would do a dry run on a dummy and then weigh it.