To determine how many pizzas you need for a certain number of people, a common and practical formula is: Number of pizzas = (Number of guests × 3 slices per person) ÷ 8 slices per large pizza This means you estimate about 3 slices per adult, and since a large pizza typically has 8 slices, you divide the total slices needed by 8 to get the number of pizzas to order

Example:

• For 20 people:
  20 × 3 = 60 slices needed
  60 ÷ 8 = 7.5 pizzas
  So, order 8 pizzas

Additional considerations:

• Children usually eat fewer slices (about 2 slices per child)

• If you expect bigger appetites or no other food served, consider ordering a bit more.
• Large pizzas are generally more cost-effective and feed more people than smaller sizes

• For medium pizzas (usually 8 slices), the same formula applies but adjust slices per pizza accordingly

Summary:

• Adults: ~3 slices each
• Large pizza: 8 slices
• Formula: (Guests × 3) ÷ 8 = pizzas needed
• Round up to ensure enough pizza

This approach works for most parties and pizza styles