A Costco pizza is quite large, measuring 18 inches in diameter, which is significantly bigger than a typical take-out pizza and roughly the size of two dinner plates

. Each pizza is cut into 12 slices, which is more than the usual 8 slices found in many other pizzas

. This size and slice count make it suitable for feeding a small group. Typically, one Costco pizza can comfortably serve about 5 to 6 people, with some estimates suggesting it can feed 3 to 4 people if each person eats 3 to 4 slices

. The slices are large and filling, so many people find that one pizza is enough for a small family or group. For larger gatherings, multiple pizzas would be needed accordingly

. In summary:

• Diameter: 18 inches
• Number of slices: 12
• Serves approximately 5 to 6 people (depending on appetite)

This makes Costco pizza a popular choice for feeding groups affordably and conveniently