How Many Calories Are in a Slice of Costco Vanilla Cake?

November 7, 2025 •

3 min read

According to nutritional data from recent sources, a slice of Costco's 10-inch round vanilla cake can pack around 440 calories, while a serving of the white sheet cake is typically less, closer to 340 calories. For many seeking to balance indulgence with health goals, understanding exactly how many calories are in a slice of Costco vanilla cake is the first step toward enjoying it responsibly.

Quick Summary

The calorie count for a Costco vanilla cake slice varies significantly depending on the specific product, with the round cake having a higher caloric value per standard serving than the white sheet cake.

Key Points

Round Cake Calories: A standard slice (1/16th) of the 10-inch round vanilla mousse cake contains approximately 440 calories.
Sheet Cake Calories: A typical serving (90g) of the white sheet cake is lower, with about 340 calories.
Key Differences: The round cake is generally higher in fat, sugar, and calories due to its mousse filling and larger standard serving size.
Serving Size Matters: Homemade portion sizes vary widely, and cutting a larger slice will increase the actual calorie consumption.
High Sugar Content: Both cakes contain a substantial amount of added sugars, particularly the round cake with 43g per serving.
Moderate Enjoyment: Given the high calorie, fat, and sugar content, these cakes are best enjoyed as an occasional treat rather than a regular dessert.

The famous Costco vanilla cake is a popular choice for celebrations and gatherings, known for its generous size and sweet flavor. However, understanding the calorie content can be helpful for those managing their dietary intake. Costco offers two main types of vanilla cake in their bakery: the 10-inch round cake and the white half-sheet cake. The nutritional information differs between these two options, largely due to variations in ingredients and standard serving sizes.

Calorie and Nutritional Information

The calorie count for a slice of Costco vanilla cake depends on which cake you choose and how it's portioned. Here's a breakdown based on available nutritional data:

10-inch Round Vanilla Mousse Cake

A standard serving of the 10-inch round cake, often considered 1/16th of the cake (approximately 113g), contains about 440 calories. This cake typically includes a vanilla mousse filling between layers, contributing to its richness and calorie density. Other nutritional values for this serving size include:

Total Fat: 21-22 g
Saturated Fat: 9 g
Total Carbohydrates: 58-59 g
Total Sugars: 45-46 g
Protein: 3 g

White Half-Sheet Cake

The white half-sheet cake is another popular option, frequently used for larger events. A typical serving size for the sheet cake is often listed as 3.2 oz (90 g). This size portion contains approximately 340 calories. Unlike the round cake, the sheet cake usually does not have a mousse filling, resulting in a slightly lower calorie count per serving. Nutritional details for a 90g serving include:

Total Fat: 17 g
Saturated Fat: 8 g
Total Carbohydrates: 45 g
Total Sugars: 35 g
Protein: 3 g

Comparison of Costco Vanilla Cake Nutrition


Feature	10" Round Cake	White Sheet Cake
Serving Size	113g (4 oz)	90g (3.2 oz)
Calories	440 kcal	340 kcal
Total Fat	22g	17g
Saturated Fat	9g	8g
Carbohydrates	58g	45g
Total Sugars	45g	35g
Protein	3g	3g
Mousse Filling	Yes	No

The Importance of Serving Size

The nutritional information provided is based on standard serving sizes, but the actual number of calories consumed can vary greatly depending on how a cake is sliced at home. A larger slice from either cake will obviously contain more calories, fat, and sugar. Being mindful of portion control is key when enjoying these rich desserts.

Tips for Enjoying in Moderation

For those looking to enjoy Costco vanilla cake while managing their intake, consider these tips:

Use a guide to cut servings: Aim for consistent, standard portion sizes.
Share a slice: Splitting a slice with someone can halve the calorie count.
Limit frosting: Reducing the amount of frosting, which is high in sugar and fat, can decrease calories.
Balance with other foods: Enjoy cake as part of a balanced diet with nutrient-dense foods.

For general information on nutrition labeling and understanding daily values, authoritative sources like the U.S. Food & Drug Administration (FDA) offer helpful resources. You can learn more about nutrition guidelines on the FDA website.

Conclusion

A slice of Costco vanilla cake, whether the 10-inch round with mousse (approx. 440 calories per standard serving) or the white sheet cake (approx. 340 calories per standard serving), is a decadent treat. Both are high in sugar and fat. Enjoying these cakes in moderation and being mindful of serving sizes are important for incorporating them into a balanced diet. Understanding the calorie difference between the two types of cakes can help individuals make informed choices.

Frequently Asked Questions

Yes, the reported calorie counts for both the round and sheet Costco vanilla cakes include the frosting, as it is a significant contributor to the cake's overall fat and sugar content.

The 10-inch round vanilla cake is higher in calories per serving primarily because it contains a vanilla mousse filling in addition to the frosting, which is not present in the white sheet cake.

While nutritional information is often a legal requirement, some in-store bakery products are exempt from FDA labeling laws. However, Costco does provide this information to customers who inquire.

You can reduce the calories by simply eating a smaller portion, or by scraping off some of the heavy buttercream frosting, which contains a high concentration of sugar and fat.

The primary sources of calories are carbohydrates, particularly added sugars, and fats from the cake base, filling, and buttercream frosting.

Yes, nutritional information for other bakery items can sometimes be found on Costco's website in PDF attachments or by asking a bakery associate directly, as they have access to the data.

The white sheet cake has fewer calories and less fat and sugar per standard serving than the round vanilla cake, making it a relatively lighter, though still indulgent, option.