So I have decided to make my son's birthday cake this year. I was gifted a set of cake pans that are each 3 inches tall. I am going to just use a box cake mix and tweak it with a recipe I found online. I am going to make a 2 tier cake, an 8 inch and a 10 inch. How many boxes of cake mix will I need?
Using the above link will make it possible for you to use just 2 boxes of mix. Each box will make enough batter to fill one 10" round and about 1/2 the batter needed for one 8" round.
A tier is made up of 2 layers. You need to bake two 10"ers and two 8"ers. You could get by with only 1 8" layer depending on the look/design you are making.
Each pan should be filled 1/2 way up the sides. That should yield a 2" layer. Most people who use 3" deep pans prefer it that way.
Hope that answers you ? :)