How many slices in a Costco pizza?
Twelve. A whole Costco food court pizza is 18 inches across.
Updated November 12, 2026
Slices and size
A whole pizza from the Costco food court is 18 inches across and is cut into 12 slices. That is about 254 square inches of pizza, which is 65% more than a 14-inch large from a typical chain.
The single slices sold at the counter are bigger. They come from a pizza cut into 6, so one counter slice is two slices of a whole pie.
How many people does a Costco pizza feed?
Four to six. Each of the 12 slices is about 21 square inches, a little bigger than a slice of a regular large. Adults with average appetites eat about 3 slices, and children eat about 2.
| Guests | Costco pizzas |
|---|---|
| 6 | 2 |
| 10 | 3 |
| 20 | 5 |
| 30 | 7 |
| 50 | 12 |
For other group sizes, pick the 18-inch size in the pizza calculator.
Good to know
- Call your warehouse ahead for several pizzas. Large orders take time.
- Menus and sizes can change. Confirm with your local Costco before a big order.
- This site is not affiliated with Costco.
See an 18-inch pizza at real size.