Here's How Many People One Costco Pizza Can Serve - Tasting Table
Briefly

Costco is renowned for its food court, particularly for its oversized pizza. Measuring 18 inches in diameter and cut into 12 slices, Costco's pizza is larger than standard pizzas, making it an excellent value for its price of about $10. This single pizza is generally adequate for five to six adults, but some might find it suitable for more, especially in a casual setting. Costco offers three varieties: cheese, pepperoni, and combo. Its bulk nature is not just perfect for groups but also encourages customers to enjoy leftovers.
A Costco pizza measures 18 inches in diameter and is cut into 12 slices, which is significantly larger than a typical pizza, providing excellent value.
While a single Costco pizza can realistically serve five to six adults, planning for more is wise if hosting a larger gathering.
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