This was the first cake that I was asked to make after finishing my cake class. I had a terrible time figuring out what size was considered a full sheet cake. Some people told me 12 by 18. Other people told me to put two 11 by 15 cakes together, so that is what I did. It was huge!! 22 by 30 to be exact. I also had a hard time getting the icing to look RED. I used almost a whole bottle of icing color, because it looked pink at first. I spent 3 times the amount of money that I made on that cake.