How do i figure out how much batter to make?? I am doing my first big cake and wonder how do i know how much batter, icing etc. to make. My recipe for my cake makes 2 6 in layers and 2 10 in Rounds. But if my cake will be a 14 in square, 10 in round, 8 in round is there a way to find out how much batter to make or is it a guessing game? I fill my pans 1/2 to 2/3 full.

Here is a link I found. I hope this helps.
http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm