how big is a full sheet cake
Most bakeries in the U.S. have three standard sizes of sheet cakes available. 1  1/4 Sheet Cake, 9â³ x 12â³, serves 12-28. 2  1/2 Sheet Cake, 11â³ x 15â³, serves 18-40. 3  Full Sheet Cake, 18â³ x 24â³, serves 48-108.