Costco Sheet Cakes: Heaven on a Sheet

Costco sheet cakes are the perfect way to celebrate any special occasion. These large, decadent cakes come in a variety of flavors, from classic yellow cake with luscious chocolate frosting to rich and creamy carrot cake with cream cheese frosting. No matter which type you select, a Costco sheet cake is sure to please the crowd.

A Cake for Everyone

Costco’s sheet cakes come in three sizes, 12-inch, 18-inch, and 24-inch, so there’s an option for any budget. The cakes feed anywhere from 24 to 56 people, so even large gatherings can be taken care of. The cakes are incredibly fluffy and moist, with plenty of frosting, ensuring everyone gets a sweet bite. At only $19.99, the 18-inch cake can feed up to 56 guests, so it makes the perfect affordable option for large gatherings.

A Variety of Choices

The 12-inch cake serves 24 people and the 24-inch cake serves between 45 and 56 people. Not only are the cakes available in different sizes, but there are multiple flavors available to choose from. Costco offers a classic yellow cake with a chocolate fudge frosting, a lemon cake with lemon buttercream frosting, and a carrot cake topped with a creamy cream cheese frosting. Plus, an 18-inch single-tier white cake with white buttercream roses is available for special milestone birthdays or weddings.

Making a Costco Sheet Cake at Home

You don’t need to go to the store to enjoy a Costco sheet cake. They can easily be made at home with this recipe.


  • 1 package of vanilla cake mix
  • 3 eggs
  • 1 cup of oil
  • 1 cup of water
  • 1 container of chocolate frosting


  1. Preheat oven to 350 degrees.
  2. Grease a 13×18-inch sheet pan.
  3. Mix together cake mix, eggs, oil and water in a large bowl until blended.
  4. Pour batter into the greased pan and spread evenly.
  5. Bake for 25-30 minutes, or until a toothpick inserted into the cake comes out clean.
  6. Let the cake cool completely.
  7. Spread the chocolate frosting over the top of the cooled cake.
  8. Slice and serve!


Costco sheet cakes are the perfect way to celebrate any special occasion. These large and delicious cakes come in a variety of sizes, flavors, and amounts, so there’s something to please everyone. Best of all, you can enjoy these cakes any time with this easy recipe. So why not try making a Costco sheet cake today?