Cake Serving Calculator

It works from the pan's top area. A round pan is pi times the radius squared, and square or rectangle pans are length times width. The area is then divided by the slice size and rounded down to whole servings.

A party slice is about 2 by 2 inches, or 4 square inches, the size most people expect for casual cake. A wedding slice is a slimmer 1 by 2 inches, or 2 square inches, so the same cake yields about twice as many servings.

Area lets you compare any shape fairly. A 9 inch round and an 8 inch square hold different amounts even though both sound similar, and only the area, about 63.6 versus 64 square inches, shows how close they really are.

These counts assume a single, standard height layer. A taller cake or a stacked, multi layer cake holds more, so for tiered cakes add up the servings for each tier using its own pan size.

No. They are planning estimates based on common slice sizes. Real servings depend on how the cake is cut, the cake height, and how generous the slices are, so add a small margin when ordering or baking for a crowd.