There are 12 regular-sized slices on an 18″ Costco pizza.
Single slices that you order over the counter at the Costco food court are “double slices” or roughly 1/6 of a whole pizza.
Generally, you can expect that a Costco pizza will feed 4-6 adults or 8-10 children.
How Many Costco Pizzas Should I Order?
Ok, so by now you may be wondering how many Costco Pizzas you should order for your event.
Certainly, you don’t want to run out of pizza. Been there – done that. It’s no fun!
But you also don’t necessarily want to over-order and be left with pizza for days but also spend more than you need to.
Here is a general Costco Pizza guidline based on a rule of thumb of 2 slices of pizza per person:
| Guests | Costco Pizzas Needed | Slices | Cost |
| 5 | 1 pizza | 12 slices | $9.95 |
| 10 | 2 pizzas | 24 slices | $19.90 |
| 15 | 3 pizzas | 36 slices | $29.85 |
| 20 | 4 pizzas | 48 slices | $39.80 |
| 25 | 5 pizzas | 60 slices | $49.75 |
| 30 | 5 pizzas | 60 slices | $49.75 |
| 35 | 6 pizzas | 72 slices | $59.70 |
| 40 | 7 pizzas | 84 slices | $69.65 |
| 45 | 8 pizzas | 96 slices | $79.60 |
| 50 | 9 pizzas | 108 slices | $89.55 |
You may want to err on the side of caution and get more pizza than you think you’ll need, but you can also gauge it by how likely your guests are to eat more or less than 2 slices per person.
In general, kids eat less, and adults eat more, but that isn’t always the case.
Costco Pizza Order Calculator
If you’ve made it this far, you may want to see exactly how many Costco pizzas you should order.
Here is a Costco pizza calculator that we built to help get a specific number for your needs (assuming 2 slices per adult, and 1.5 per child):
Enter the number of adults and/or kids:
Just remember that depending on the hunger level and how much leftovers you may want to adjust up or down!
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