Pizza calculator (how many to order)
Find out how many pizzas to order for your group, from headcount, appetite and slices per pizza. Example: 10 adults with a normal appetite ≈ 4 large pizzas.
Slice-based estimate. Drinks, starters and dessert reduce pizza intake; a variety of flavors tends to increase it.
How the calculation works
We multiply people by the slices each eats and divide by the slices in a pizza, rounding up: pizzas = ceil(people × slices per person ÷ slices per pizza). A practical average is 3 slices per person.
Examples
- 10 people × 3 slices ÷ 8 per pizza = 3.75 → 4 pizzas.
- A hungry group (4 slices/person): always round up.
Frequently asked questions
How many slices in a pizza?
A large pizza usually has 8 slices; family size, 10 to 12. Adjust the field to your pizzeria.
How many slices does a person eat?
About 3, but it varies: kids and those having starters eat less; hungry adults, more.
Do different flavors change the count?
Not the total, but half-and-half lets you offer more variety without ordering more.
Do two medium pizzas beat one large?
Not always — compare by area. A 30 cm pizza has 707 cm² and a 40 cm one 1,257 cm², 78% more.
How many pizzas for 20 people?
With a normal appetite (3 slices each) and large 8-slice pizzas, 8 pizzas. Adjust down for children and up for teenagers.
How do I know which size is the better deal?
Divide price by area, not diameter. Area is π × (diameter ÷ 2)². Price per square centimetre usually favours the larger pizza.
How many flavours should I order?
About one flavour per 4–5 people, always including a simple option. Half-and-half pizzas cover two tastes each.
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See all →Updated on June 30, 2026 · by Rafael Rossi · Methodology & sources