How many cake slices to plan per guest
Too much cake, you pay for nothing. Too little, some guests leave unsatisfied. The right calculation relies on two things: the weight of a slice and the role of the cake in the meal. Here are the numerical benchmarks and a ready-to-use table.
The reference slice: 100 to 120 g
An individual pastry portion is between 100 and 120 g per person for a dessert served on a plate. This is the basis of a classic meal. In cake design, we also think in volume. A so-called classic slice of layer cake measures about 2.5 cm wide by 5 cm deep, equivalent to a dessert after a hearty meal. The indulgent slice, 4 to 5 cm wide, serves as the main dessert and reduces the number of guests served from the same cake.
The size of slices according to the type of cake
The type of cake changes the calculation. A wedding cake is cut into thin, tall slices: the so-called wedding slice is 1 inch wide by 1 inch deep for the height of the cake, which is significantly smaller than the party slice of 2 inches wide. At the same diameter, a wedding cake serves many more guests than a birthday layer cake, which is cut into more generous slices. The pièce montée made of cream puffs is counted differently: average about 4 puffs per person, a little less if the puffs are large, a little more if they are small.
Practical table: slices to plan
Starting from a classic slice and a single dessert service, here are the volumes to aim for. The ranges include a margin of 10 to 15% recommended for unforeseen circumstances.
| Guests | Layer cake (slices) | Wedding cake (slices) | Pièce montée (cream puffs) |
|---|---|---|---|
| 10 | 11 to 12 | 11 to 12 | 30 to 40 |
| 20 | 22 to 24 | 22 to 24 | 60 to 80 |
| 30 | 33 to 36 | 35 to 40 | 90 to 120 |
| 50 | 55 to 58 | 55 to 60 | 150 to 200 |
| 80 | 88 to 92 | 90 to 96 | 240 to 320 |
For a layer cake, a round cake of 20 cm in diameter and 10 cm high gives 20 to 24 classic slices. A 25 cm cake yields 32 to 36 slices. To aim for a precise number, your maker adjusts the diameter and the number of tiers. Compare the available formats in the catalogue.
Single dessert or buffet: the rule that changes everything
If the cake is the only dessert, count on one full slice per guest. If it is part of a sweet buffet with other options, apply a coefficient of about 0.75 slices per person: not everyone will take cake, and each will pick from elsewhere. On a buffet of varied desserts, the slice of cake can therefore be smaller, with the total sweetness spread over several treats. Conversely, for a birthday cake served as the main dessert, plan for the indulgent slice and round up.
Frequently Asked Questions
How many slices for a cake for 50 people?
Aim for 55 to 60 slices for a single dessert, safety margin included. In a buffet with other desserts, 38 to 40 slices are sufficient. In terms of format, count on a croquembouche of 150 to 200 puffs or a tiered wedding cake sized by your maker.
How many puffs per person for a pièce montée?
Between 3 and 4 puffs per guest. Three puffs are sufficient if they measure about 5 cm once baked, four if you go for puffs of 4 cm. Plan for a few extra puffs, as some may break during assembly.
Should I order more than the number of guests?
Yes. A margin of 10 to 15% covers last-minute guests, second slices, and losses during cutting. It's less costly than having an empty dessert table before the end of the evening.
Sources
Culinary Notebook, weight of individual portions ; Sugar & Sparrow, cake serving guide ; Love & Cakes, number of slices for layer cake ; Let Them Eat Cakes, guide to portion sizes ; Mariage Passion, calculating portions of a wedding cake ; Bernard Dauphin, successfully making your croquembouche.