Enter your guest count and preferences. Get the right pan size, estimated servings, and a printable cutting guide in seconds.
Plan Your CakeCut into 12 even wedges from the center.
A typical party slice is about 1 inch wide, 2 inches long, and 4 inches tall. That is roughly 8 cubic inches of cake. The planner uses this to figure out how much cake you need and which pan gives you that amount.
Round pans use π × radius² × depth. Square pans use side² × depth. Sheet pans use length × width × depth. The planner compares the total cake volume needed against standard pan sizes and picks the closest match that covers everyone.
Thicker cakes in smaller pans take longer. Larger, thinner cakes bake faster. The planner adjusts the estimate based on pan size and layer count. Always start checking a few minutes early. Ovens vary.
An 8-inch round cake with one layer gives you about 10 standard slices. That is enough for 8 guests with a couple of extras. Bake at 350°F for 25 to 30 minutes. If the birthday kid wants a big slice, you are still covered.
A 9×13 sheet cake is the easiest way to feed a classroom. You get about 20 standard slices with simple grid cuts. Bake at 350°F for 30 to 35 minutes. Sheet cakes are also easier to transport in the pan.
Two 9-inch round layers give you about 26 slices. If you need 30, either go with a half-sheet pan (about 36 slices) or bake two round cakes. Two cakes also give you a chance to try two flavors.
Go with the larger pan. A slightly thinner cake is better than running short. You can always trim slices smaller if there is extra.
This planner is for single-tier cakes. For tiers, plan each tier separately using the number of guests each tier should cover.
Kids usually eat about half a standard slice. If half your guests are children, count them as half when entering the total.
The sheet cake option works for rectangular pans. For cupcakes, a standard batch of 24 usually serves 12 to 16 people depending on size.