Pizza quantity estimator
Work out how many pizzas to order for a party, from your guest count and expected slices per person.
Result
Pizzas needed
How to use this tool
- Enter the number of guests.
- Set slices per guest and slices per pizza.
- Read the number of pizzas to order.
Assumptions
- Assumes all guests eat a similar amount of pizza — adjust the slices-per-guest figure if pizza isn't the only food on offer.
Technical details: what the fields mean
- Number of guests
guests - Total number of guests expected.
- Slices per guest
slicesPerGuest - Your planned slices per guest. The default is an example; appetite, age, event length and other food change the amount.
- Slices per pizza
slicesPerPizza - Enter the number of slices your pizzeria cuts from the size you plan to order; the 8-slice default is only an example.
Methodology
Pizzas needed = ceil(guests × slices per guest ÷ slices per pizza).
Worked example
Illustrative scenario: 20 guests, 3 slices each, pizzas cut into 8 slices
Inputs: Number of guests: 20, Slices per guest: 3, Slices per pizza: 8
Result: ceil(20 × 3 ÷ 8) = 8 pizzas. Change both serving assumptions for your menu and supplier.
Practical guidance
- Set slices per guest based on the rest of the menu, appetite and whether pizza is the main dish; use the supplier's actual cut count.
Common mistakes
- Rounding down the pizza count instead of up, leaving some guests short.
FAQs
How many pizzas do I need for 20 people?
Enter 20 guests, then choose the slices per guest and slices per pizza for your appetite, menu and pizza size. For example, 3 slices each and 8 slices per pizza gives 8 pizzas; these are editable assumptions, not a universal serving size.
Last reviewed: 2026-10-11
A simple average-consumption estimate — actual appetite varies by guest and by what else is being served.
This tool provides an indicative estimate, based on the assumptions stated above.
Theme and tool preferences, along with saved and recently used lists, are stored only in this browser.