What Size Cake for 20 People?

What Size Cake for 20 People?

The size of the cake is one of the most crucial considerations when making a cake for any occasion. A 9-inch cake typically serves 20 to 24 people. But one individual can eat all three and a half square inches of cake.

The cake is a universally known sweet treat. Almost everyone likes to eat cake on different special occasions. The cake is a celebratory treat that is cut often different parties and functions, including:

  • Birthdays
  • Anniversaries
  • Weddings
  • Christmas
  • Baby Showers
  • Bridal Showers
  • Engagement 

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Cakes come in a wide variety of forms, sizes, and varieties at various eateries. Nonetheless, sheet, square, and circular cakes are the most popular cake shapes. We’ll get into some more information regarding these cake shapes here.

Circle cakes:

The most popular cake type that is served in practically every restaurant is the circle cake. These cakes are well-liked for celebrations like birthdays and weddings. We shall now discuss the size and serving of circle cakes.

  • 6-inch cake serves about 8 people
  • 8 inches serves about 12 to 14 people
  • 10 inches, approximately serves up to 25 people 
  • 12 inches can serve about 30 to 25 people

Sheet cakes:

Large events or get-togethers, such as weddings, engagements, or Christmas celebrations, typically serve sheet cakes. But what it serves is:

  • Quarter Sheet cake (9 x 13) serves 20 to 24 people
  • Half sheet cake (11 x 15) serves about 30 to 40 people
  • Full sheet cake (18 x 24) serves up to 60 to 70 people

Square Cakes:

The square cake cutting is easier than circle cakes due to its shape. Plus it provides more serving than the other cakes.

  • 6 Inch serves about 10 to 12 people
  • 8 Inch approximately serve 16 to 20 people
  • 10 Inch serves up to 25 to 30 people
  • 12 Inch can serve about 36 to 40 people

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Yes you can customize, its not a big deal. Many businesses are providing customization services too. Puratos also provides a customization facility to its customers. If someone wants to change their cake presentation, cake decoration, fillings, toppings, message, or even cake shape and size, then they request it from the restaurant staff. And your cake will be ready just the way you like it.

On the other hand, some restaurants cannot offer a customization facility. They will already bake and decorate the cake and serve it as it is. In this situation, you can just change the message like name, and greetings, and write the message according to the occasion.

For 20 people, you typically need a 9-inch round cake or an 8-inch square cake.

9-inch round cake can provide approximately 20 to 24 servings, depending on the slice size.

Yes, a quarter sheet cake (9×13 inches) can serve around 20 people.

Yes, taller cakes with multiple layers can yield more servings, so a 2-layer or 3-layer cake may serve more people than a single-layer cake of the same diameter.

If you prefer larger slices, consider a 10-inch round cake or a larger sheet cake to ensure everyone gets a satisfying portion.

Yes, rich or dense cakes like chocolate or carrot cake may be served in smaller slices compared to lighter cakes like sponge or chiffon.

It’s always a good idea to have a few extra servings to accommodate unexpected guests or second servings. Consider ordering a cake that serves 24-25 people for a group of 20.



Choosing the right cake size for 20 people ensures that each guest enjoys a satisfying portion while adding to the celebration’s success. A 9-inch round cake or an 8-inch square cake generally provides the ideal amount of servings, but you can also opt for a quarter sheet cake or even cupcakes for a personalized touch. Considering factors like cake height, slice size, and cake type can help you make an informed decision. Ultimately, planning for a few extra servings can ensure everyone leaves happy and satisfied.

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