how long to bake a 12x18 sheet cake
Now, baking and batter amounts; 12x18x2 you will need 14 cups of batter and bake it at 325 degrees for 45-50 minutes (don't forget your heating core). A 12x18x3 you will need 20 cups of batter and bake it at 325 degrees for 85 to 90 minutes. A cake mix yields about 4-1/2 to 5 cups of batter.Cake pans should only be filled 1/2 full. When you purchase your pans it should also come with instructions.ake pans are generally 2 inch or 3 inch deep, not one inch. I believe you purchased a cookie sheet. I have some that very size. Wilton makes 9x13, 11x15 and 12x18. You can purchase them in 2 inch or 3 inch depth. You can find them at your local craft store in the cake decorating isle.