TopicSheet cake sizes at costco.
PostedTue, Sep 17th 2019 22:02 PM
It takes two 18-ounce boxes of cake mix to make a half sheet cake, measuring approximately 12-by-18 inches. A half sheet cake provides 36 to 108 servings, depending on how it is sliced. Commercially prepared half sheet cakes are often made by assembling two 9-by-13-inch cakes on a cake board.
It is virtually impossible to torte (cut in half) a sheet cake without it cracking or crumbling. Always chill the sheet cake if you are going to torte it so it is firm and cuts smoothly. Nevertheless, it is better to bake the layers in separate pans.