I am using a Duncan hines cake mix. I am making a double layer 10 inch cake with only one pan. So how much cake batter should I use?
Each box of Duncan Hines cake mix yields approximately 5 cups. Per the Wilton chart you need 6 cups per layer for a 10"round cake. So you will need 3 boxes of cake mix. With the extra batter you could make some cupcakes and throw them in the freezer to eat later.
I would use one box per pan if they are 2" tall pans.