A full size or average size sheet cake can serve at least 64 people.
The average sizes of a sheet cake is 18x24x2 or 18x26x2 inches in size.
A quarter size sheet cake contains up to 18 servings, a half size sheet cake contains up to 36 servings and a full sheet cake contains up to 64 servings.
The reason it's called a sheet cake is because the sheet cake is made in a sheet cake pan.
Sheet cakes are also known as slab cakes and are a cake that is baked in a large, flat rectangular pan such as a sheet pan or a jelly roll pan.
These single-layer cakes are almost always frosted, with decorations and ornamental frosting along the borders and the flat top surface.
In the United States, the sheet cakes cakes are commonly available in supermarkets and bakeries and tend to be inexpensive due to their simple baking and preparing process.
Sheet cakes may also be made in any flavor, with chocolate and vanilla being the two most common.
Commonly made in the home with boxed cake mixes, they can come in a variety of additional flavors, with colorful batter mix-ins such as sprinkles and chocolate chips.
By definition the sheet cakes are made from a single continuous piece of cake.
Ingredients such as sprinkles, chocolate chips, or coconut may be sprinkled over the top of the sheet cakes.
A layer cake may be made from a sheet cake that has been split, filled with jam or icing, and frosted.
A US commercial sheet cake pan is 18x24x2 or 18x26x2 inches in size.
In the UK, Canada, and Australia a similar cake is referred to as a slab cake.