How much pizza per person?
Three slices of a large for an average adult. Here is how that changes with appetite, age and pizza size.
Updated November 12, 2026
Slices per person
| Who | Slices of a large |
|---|---|
| Light eater | 2 |
| Average adult | 3 |
| Very hungry adult or teenager | 4 |
| Child aged 6 to 10 | 2 |
| Child under 6 | 1 |
A slice is not a fixed amount
A slice of a 12-inch pizza is about 14 square inches. A slice of an 18-inch pizza cut into eight is about 32. So "three slices" means very different amounts of food. A better measure is area: an average adult eats about 58 square inches of pizza.
- 10-inch pizza, 6 slices: an adult eats 4 to 5 slices.
- 12-inch pizza, 8 slices: an adult eats 4 slices.
- 14-inch pizza, 8 slices: an adult eats 3 slices.
- 16-inch pizza, 8 slices: an adult eats 2 to 3 slices.
- 18-inch pizza, 8 slices: an adult eats 2 slices.
What changes how much people eat
- Time of day. People eat more at dinner than at a lunch meeting.
- Other food. Sides and dessert cut pizza eating by about a quarter.
- Crust. Thin crust is less filling, so people eat more slices. Deep dish fills people up fast.
- Drinks. A long evening with drinks means more pizza.
- Toppings. Meat-heavy pizzas are more filling than plain cheese.
Put your group into the pizza calculator and it does this arithmetic for you, including the toppings split and the cost per person.