When someone asks for a "sheet cake" I always ask how many servings they're after. The biggest cake I do is the half-sheet, which is my 12x18. (Bakeries around here use a 12x16 for their half-sheets). It takes about 15 cups of batter, and will serve aproximately 50 people. The quarter-sheet is a 9x13, takes 7.5 cups of batter, and serves about 20-25. The 11x15 takes 11 cups of batter, and serves about 35. I price mine to be competitive with the bakeries, and the bakeries run a bit higher than the grocery stores.
See my prev posts on these threads that may help you.....
http://www.cakecentral.com/cake-decorating-ftopicp-2688103-.html#2688103
http://www.cakecentral.com/cake-decorating-ftopicp-2712383-.html#2712383
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