My husband asked me to make a big round carrot cake for him to take to work. The largest pan I thought I had was 8" for very big. I phoned the Bulk Barn to see what their largest pan size was, 16", very big. I went and got the pan, doubled the cake batter and then put the pan in the oven. The pan was too big for the oven, and got pushed up when you closed the door. I thought, maybe if I rotate the pan frequently it will come out even. NOT TRUE! I later remembered that I have a 10" spring form pan that probably been big enough.