How Much Pizza and How Many Drinks for a Party? Quantities by Guest Count
October 29, 2026
Ordering food for a group is a classic quantity problem: too little embarrasses the host, too much wastes money. For pizza, the basic formula is guests × slices per person ÷ slices per pizza, rounded up. A large 14-inch pizza is usually cut into 8 slices. Plan about 3 slices per adult and 2 per child; teenagers and hungry crowds may eat 4.
For 20 adults and 10 children: 20 × 3 + 10 × 2 = 80 slices, which is 10 pizzas. At $14 each, the cost is $140, or $4.67 per guest before tax and tip.
Skip the math and get your answer instantly:
Open the Percentage Calculator →Pizzas by Number of Adults
The table shows pizzas needed if all guests are adults at 3 slices each. If other food is served, such as salad, wings, or dessert, reduce to 2 slices per person. If the event is a lunch, 2 to 3 slices; for dinner or a game night, 3 to 4. Mix toppings by popularity: roughly 40% cheese or pepperoni, 30% other meat, and 30% vegetarian, with at least one vegetarian and gluten-free option if guests have dietary needs.
Round up, because running out is worse than a few leftover slices. Leftover pizza is easy to refrigerate and reheat.
| Adult guests | Slices (3 each) | Large pizzas (8 slices) | Cost at $14 each |
|---|---|---|---|
| 10 | 30 | 4 | $56 |
| 20 | 60 | 8 | $112 |
| 30 | 90 | 12 | $168 |
| 50 | 150 | 19 | $266 |
Drinks
A common planning rule is 2 drinks per guest in the first hour and 1 per guest in each following hour. For a 4-hour party with 20 guests: 20 × (2 + 3) = 100 drinks. Divide by type according to the crowd: for a casual party, perhaps 50% soft drinks, 30% water, and 20% other. A 2-liter bottle has about 6 glasses of 12 oz; 100 drinks of 12 oz require 100 × 12 ÷ 67.6 = 17.8 two-liter bottles in total volume if all were soft drinks. Ice: allow 1 pound per person, or 20 pounds for 20 guests, and double it in hot weather for drinks served over ice.
Cost Per Person and Budget
Take the budget and divide by guests to compare options. 10 pizzas at $14 plus 100 drinks at $0.50 each ($50), ice at $8, and paper goods at $15 total $213, or $7.10 per guest for 30. Ordering in bulk, picking up instead of delivery, or using a combo deal can reduce costs by 10% to 20%. Ask about large-order discounts, and order 30 to 45 minutes earlier than serving, as delivery delays are common.
Adjusting for Your Crowd
Adjust for the audience: sports events and teenagers eat more, business lunches with side dishes eat less, children's parties need fewer slices but more drinks per child. Check dietary restrictions and allergies ahead of time. Keep food at safe temperatures: perishable food should not sit out more than 2 hours (1 hour above 90 degrees Fahrenheit). Order in two waves for a long event so the food stays hot.
Frequently Asked Questions
How many slices should I plan per person?
About 3 per adult and 2 per child.
How many slices are in a large pizza?
Usually 8.
How many drinks per guest?
Two in the first hour and one each additional hour.
How much ice do I need?
About 1 pound per guest.
How long can pizza sit out?
No more than 2 hours, or 1 hour in hot weather.