Pizza Party Calculator
Find out how many pizzas to order for a party, office lunch or family gathering. Adjust guests, slices per person, slices per pizza and budget.
Calculate your estimate
Planning estimates only. Serving sizes, guest appetite, prices and restaurant policies vary. Confirm quantities and prices with your provider.
Frequently Asked Questions
How many pizzas do I need for 20 people?
If each guest eats three slices, you need 60 slices. With eight slices per pizza, that is eight pizzas before any extra buffer.
How many slices does a large pizza have?
Many large pizzas are cut into eight slices, but sizes and cuts vary by restaurant. Use the slice count offered by your pizza shop.
Should I count children differently?
Yes. Children often eat fewer slices than adults. Adjust the guest count or average slices per person to reflect your group.
How do I plan for different toppings?
Offer at least one simple cheese or vegetarian option and ask about allergies and dietary restrictions before ordering.
How many pizzas do you need for a party?
Multiply the number of guests by your expected slices per person. Add a small allowance if desired, then divide by the number of slices in each pizza and round up to a whole pizza.
Pizza party calculation example
For 20 guests eating three slices each, you need 60 slices before any buffer. If each pizza is cut into eight slices, that’s eight pizzas. With a 10% slice allowance, you need 66 slices, or nine eight-slice pizzas. At a hypothetical $15 per pizza, nine pizzas cost $135 before tax, delivery and tip.
Choosing the right number of slices
Appetite depends on age, pizza size, crust, toppings and whether other food is served. The starting value of three slices per person is only a planning example. Change it for your group. Always check how many slices your chosen restaurant actually cuts from each pizza.
Frequently asked questions
How many pizzas for 20 people?
At three slices each and eight slices per pizza, eight pizzas provide 64 slices. With a 10% allowance, the calculator recommends nine pizzas.
How many slices are in a large pizza?
Slice counts vary by restaurant and size. Eight slices is a common example, but confirm the actual cut before ordering.
Related tools: All restaurant calculators · Catering cost per person · Tip calculator