Hi everyone im new to here and fairly new to the world of cake decorating but have been given the job of making my dads 60th birthday cake so doing a number 60 with a fishing theme, all fine have drawn my design etc etc the only think im having trouble with is knowing how much icing I need to ice both the number 6 and 0 cakes there going to be about 14" long x 10" wide and 3" deep can anyone help with this or tell me how I can work it out?   Thanks in advance Rebecca