Our free pizza calculator tells you exactly how many pizzas to order for any event or party.
Get a tailored estimate based on your group's specific needs—number of adults, children, and their appetite levels.
Order the right amount to avoid overspending on too many pizzas or disappointing guests with too few.
Ideal for birthday parties, office lunches, game nights, family dinners, or any event where pizza is on the menu!
This pizza calculator makes ordering simple. Enter your group details below, and we'll calculate the exact number of pizzas you need:
We base our calculations on standard slice counts (Small: 6, Medium: 8, Large: 10) and always round up to ensure everyone gets their fill.
Unlike generic "3 slices per person" rules, our pizza calculator accounts for children eating less than adults and lets you customize appetite levels for accurate results every time.
Get instant answers to the most common pizza planning questions:
Small: 6 | Medium: 8 | Large: 10 slices
4 large pizzas for adults, 3 for mixed groups
7-8 large pizzas for adults, 5-6 for mixed
9-10 large pizzas for adults, 7-8 for mixed
11-12 large pizzas for catering events
19-20 large pizzas for large events
Age-by-age planning tips & quantities
Small vs Medium vs Large - best value?
Consider Dietary Restrictions: Always ask your guests about allergies or preferences like vegetarian, vegan, or gluten-free options. Most pizzerias offer alternatives.
Variety is Key: Ordering a mix of toppings usually pleases more people. Include a classic cheese or pepperoni, a veggie option, and maybe something more adventurous!
Don't Forget Sides & Drinks: Salads, wings, breadsticks, and a selection of beverages complete the meal.
Order in Advance: Especially for large orders or during peak times, calling ahead or ordering online early can save you stress.
Set the Mood: Good music, comfortable seating, and some simple decorations can elevate your pizza gathering.
Become a pizza ordering expert with our comprehensive guides. From calculating perfect portions to mastering party planning strategies.
Quick pizza calculator for any group size. See exactly how many large pizzas to order for 10, 15, 20, 25, 30, 40, or 50 people. Instant answer table + the only tips you actually need.
Read GuidePlanning pizza for Super Bowl Sunday? Calculate exactly how many pizzas you need for your game day party. Covers groups of 10-50+ with timing tips for kickoff.
Read GuideComplete guide to pizza slice counts by size (6" to 18") and chain (Domino's, Pizza Hut, Papa John's, Little Caesars). Everything you need for perfect pizza planning.
Read GuideEnter the number of adults and children attending your event, select how many slices each person typically eats (light, average, or hungry eater), and choose your pizza size. The calculator multiplies guests by slices, then divides by slices per pizza to give you the exact number to order.
Most people guess using a generic '3 slices per person' rule, but this ignores that children eat less than adults and appetite levels vary. Our calculator lets you specify separate slice counts for adults and children, plus choose from light (2 slices), average (3 slices), or hungry (4+ slices) appetites for accurate results.
The calculator always rounds up to the nearest whole pizza because you can't order half a pizza. Running out of food is worse than having leftovers, and leftover pizza reheats well for the next day. If you calculate 7.3 pizzas, we recommend ordering 8.
Yes! Select your preferred pizza chain (Domino's, Pizza Hut, Papa John's, or Little Caesars) from the dropdown menu. The calculator automatically adjusts slice counts based on each chain's actual pizza sizes, since a 'large' varies between chains.
The calculator already builds in a slight buffer by rounding up. However, for events with teenagers (who eat more than average adults), buffet-style service (people take more when serving themselves), or if pizza is the only food, consider adding 1-2 extra pizzas to be safe.