How Many Cake Mixes To Use For A Sheet Cake - Easy Guide

How Many Cake Mixes To Use For A Sheet Cake – Easy Guide

Last Updated on June 11, 2022 by Zara R.

Making sheet cake with box cake mix is easy and will save you a lot of time. But, do you know how many cake mixes to use for a sheet cake?

In today’s jam-packed article, we will explore everything you need to know about box cake mixes. We will give you an in-depth answer on how many boxes to use for different-sized sheet cakes. And, we will even look at how to make them better! So, ready to dive right in?

What Are Cake Mixes?

Cake mix is a term that goes by many other names. They include box mix, box cake mix, cake premix, and boxed cake premix. All of these terms are used to essentially describe a mix of weighed-out dry cake ingredients. This mixture only needs to be hydrated to become a batter and be baked.

The purpose of these cake mixes is to cut down on preparation time when baking. They allow you to skip the ingredient prep and measuring phase, and cut right to the chase! You only have to add (usually) eggs, oil, water, or milk. That’s it! The best of the ingredients are already present.

How Much Cake Batter Per Cupcake
How Much Cake Batter Per Cupcake

Cake mixes are made up of sugar, flour, baking powder, powdered colorants, and flavorings. They also do contain additives like preserving agents and anti-caking agents. But, all of these ingredients are completely dehydrated.

How much batter goes into a full sheet cake

Can you make sheet cake with cake mix?

Sheet cakes are a very unique type of cake that isn’t usually used for beautiful cakes. Sheet cakes are most often used at kids’ birthday parties or when you don’t want to spend hours making some type of elaborate cake. They are also much easier to portion than the regular round cake.

A sheet cake is a flat slab of cake that is baked in a large rectangular shape. The exact size of a sheet cake does vary quite a lot. For this reason, many people are never sure how many cake mixes to use for a sheet cake.

A standard-sized sheet cake is roughly 18-inches by 26-inches. And, the average height of these cakes is around 1 to 2-inches. If you see higher sheet cakes, they are usually made with multiple layers of cake and are called slab cakes.

Another sheet cake pan size that is pretty standard in commercial bakeries and kitchens measures 18 by 24-inches.

Now, because sheet cakes are pretty big, many people often want to make half sheet cakes or even quarter sheet cakes. The size of a half sheet cake is around 13 by 18-inches, but some are 11 by 15-inches.

Then, a quarter sheet cake will be roughly 8 by 13-inches or 9 by 13-inches.

Now, you may be wondering why exactly there are so many estimates linked to the word “standard”. Well, the term is entirely relative to where you are located. In some countries, a “standard” sized sheet cake is 18 by 26-inches, while in another it measures 18 by 24-inches.

How Many Cake Mixes To Use For A Sheet Cake?

So, an average box of cake mix weighs around 15-16 ounces. Once you add your eggs, water (or milk), and oil, the weight of the batter will be around 2 pounds.

A full sheet of cake requires about 8 pounds of cake batter. So, ultimately you will need 4 boxes of cake mix (each weighing 15 to 16 ounces) for one full-sized sheet cake.

To be safe, we would recommend buying 5 boxes. This will help you alter the thickness of your sheet cake layer. Not to mention that many cake mixes don’t rise as much. So, by adding a little bit more batter, you will ensure your sheet cake isn’t half an inch thick.

So, our final answer to how many cake mixes to use for a sheet cake is 4 to 5 boxes.

How much buttercream do I need for a sheet cake

Half and quarter sheets

For half-sized sheet cakes, we recommend using between 2 and 3 boxes of cake mix. Again, this is to ensure you have enough cake batter to make a thick layer of cake. And, if you have a bigger pan, you are guaranteed to have enough batter.

For quarter sheet cakes, you only need 1 to 2 boxes of cake mix.

 Sheet Cake SizeCake Mixes Needed (15 to 16-ounce each)
Full Sheet Cake18 x 26-inches4-5 boxes
 18 x 24-inches4-5 boxes
Half Sheet Cake13 x 18-inches2-3 boxes
 11 x 15-inches2-3 boxes
Quarter Sheet Cake8 x 13-inches1-2 boxes
 9 x 13-inches1-2 boxes

How Much Buttercream Do You Need For A Sheet Cake?

The final answer will largely depend on the type of buttercream you have made and even how fluffy it is. You can have a single recipe that only makes 2 cups of frosting, but when using a proper mixing technique can also make 5 cups!

On average, for a half sheet of cake, you will need 3 cups of buttercream frosting to cover the entire cake. Then you would need another 2 cups to create decorative piping details if they are needed.

So, for a full sheet cake, you would naturally need a lot more frosting. We would say a safe bet is around 4 to 5 cups of frosting to cover the surface area of the cake. And, for any decorative piped details, you can add at least another 3 cups of frosting.

How To Make A Sheet Cake From Cake Mixes Better

Now that we have answered how many cake mixes to use for a sheet cake, we will look at some easy ways you can make the premixes better.

  • Replace the water in the box recipe instructions with milk or cream.
  • Add an additional egg for sheet cakes. It makes the crumb tighter which will make the cake easier to transport.
  • Substitute the oil in the recipe with melted butter instead for a better flavor and color.
  • Add more flavoring extract to enhance the flavor profile of the cake. Use high-quality extracts for a more authentic flavor. Try to avoid using essences.

Final Thoughts

We hope that you found this article on how many cake mixes to use for a sheet cake useful. You can use our handy chart to see exactly how many boxes you need for any size sheet cake!

Share this informative article with your fellow bakers so that they can also reap the benefits of such an in-depth guide.


How much batter goes into a full sheet cake?

A full standard size sheet cake measures roughly 18 by 26-inches. This creates an area that will contain about 8 cups of batter. This relates to 4 or 5 boxes of cake mix if each box weighs 15 to 16 ounces.

How many boxes of cake mix do I need for a half sheet cake?

For a half sheet cake, you will need 2 to 3 boxes of cake mix. Each box should weigh about 15 to 16 ounces to create enough batter (when mixed with the wet ingredients called for) to fill the pan and make a thick layer of cake.

How much buttercream do I need for a sheet cake?

For a full-size sheet cake, you will need a lot of frosting. To cover the surface area alone you will need about 5 cups of buttercream frosting. Then, for additional decorative details, you will likely need at least 2 more cups of frosting.

How do you make a sheet cake rise evenly?

Decrease the baking temperature by roughly 10 degrees and slightly decrease the baking time. This change may seem minor, but it will create a more level sheet cake that you don't have to slice. Furthermore, it will help prevent cracks in the surface.

Do you like this article? Share with your friends on Facebook.