Hi, there are couple of things you could do. First, look for a chart online that tells you the amount of batter you need to fill different cake pans, wilton have one. Look at the number of cups you need for the large cake, and the number of cups you get out of your small cake recipe. This will tell you if you need to make 2, 3, 4.5 or whatever number times your recipe for the large cake. Once you have this magic number, Google “recipe scaler” and there are many sites which will do all of the maths for you if you enter the recipe and the multiplication factor (the magic number we found earlier). Hope that helps x
