How many standard cake boxes will i need if i'm baking 3 or 4 9 inch round cakes? I am baking an ombre cake for my sister's birthday party. I want to use white cake mix as I don't have much time to make it from scratch and I am planning on dyeing my batter. Since I want three or four layers, how many cake mixes will I need?
If you are in the US, a standard box of cake mix makes two round layers. So you will need 2 boxes to make 4 layers. Outside the US, I think the same applies, just read the box.

I recommend 3 layers if this is among the first few cakes you have made. Bake the two boxes (4 rounds) then choose the best three of the four rounds out of the oven.