How many pizzas do you need?
Tell us who is eating. The order slip updates as you go, down to how many of each topping to ask for.
Topping mix
Set a share for each kind. The one marked fills the rest takes whatever is left.
- %
- %
- 30% fills the rest
How the calculator does the math
The count comes from one line of arithmetic: guests × slices per person ÷ slices per pizza, rounded up to the next whole pizza. Twenty adults at 3 slices each need 60 slices. Sixty divided by 8 slices in a large is 7.5, so the calculator tells you to order 8.
It always rounds up because running out halfway through the line costs more than a few leftover slices. If you want planned leftovers, bump the slices per person by half a slice instead of guessing at extra pizzas.
The topping split uses the same rule a careful person would use by hand. It works out each topping's exact share, rounds everyone down, and hands the leftover pizzas to the toppings that were closest to earning one. That way the split always adds up to the total, and no topping gets shorted because the others were rounded up first.
The guide to how much pizza per person explains when to move away from these defaults.
Slices per person
| Who is eating | Plan for |
|---|---|
| Young kids | 2 slices |
| Light eaters, or lots of sides | 2.5 slices |
| Average adults | 3 slices |
| Teens, athletes, or pizza is the only food | 4 slices |
Slices per pizza
| Size | Typical diameter | Slices |
|---|---|---|
| Medium | 12 inches | 6 |
| Large | 14 inches | 8 |
| X-Large | 16 inches | 10 |
Local pizzerias cut differently. If your shop cuts a large into 10 or 12, ask how big the pizza is and pick the closest size.
Quick chart: large pizzas by group size
Use this when you are standing at the counter. Every number follows the calculator's math.
| Guests | Young kids2 slices each | Light eaters2.5 slices each | Average adults3 slices each | Hungry crowd4 slices each |
|---|---|---|---|---|
| 10 people | 3 | 4 | 4 | 5 |
| 15 people | 4 | 5 | 6 | 8 |
| 20 people | 5 | 7 | 8 | 10 |
| 25 people | 7 | 8 | 10 | 13 |
| 30 people | 8 | 10 | 12 | 15 |
| 40 people | 10 | 13 | 15 | 20 |
| 50 people | 13 | 16 | 19 | 25 |
| 60 people | 15 | 19 | 23 | 30 |
See the full chart with advice for each group size, or read the guide to ordering pizza for 100 people if your event is bigger.
Guides for your event
- How Many Pizzas Do I Need? A Chart for 8 to 60 People Large pizza counts for 8 to 60 people at every appetite level, plus what changes when you order for 10, 15, 20, 25, or 30 to 50 guests.
- How Much Pizza Per Person? Slices by Age and Appetite Plan on 3 slices per adult, 2 per young kid, and 4 for a hungry crowd. Learn how sides, drinks, and timing shift that number and how to round.
- How Much Pizza for a Birthday Party Birthday pizza by age group, from young kids to teens, plus parents who stay, adult parties, cake timing, allergies, and a worked example.
- Ordering Pizza for the Office How many pizzas to order for a lunch meeting or office party, plus dietary needs, scheduled delivery, remote staff, receipts, and leftovers.
- How Many Pizzas for 100 People and Large Events Pizza counts for 50 to 200 guests, plus how to place a bulk order, keep pizza warm, and run serving lines at a school, church, or company event.
- Pizza Size Guide: Inches, Area, and Best Value Compare 10 to 18 inch pizzas by area, work out cost per square inch, and learn when a medium deal beats a large.
Common questions
How many pizzas do I need for 20 people?
Order 8 large pizzas for 20 adults with average appetites. At 3 slices each they need 60 slices, and 8 large pizzas cut into 8 slices give you 64. For light eaters, 7 large pizzas is enough. For a hungry crowd at 4 slices each, order 10.
How many slices of pizza should I plan per person?
Plan on 3 slices for an average adult, 2.5 when there are plenty of sides, 2 for young kids, and 4 for teenagers, athletes, or any group where pizza is the only food.
How do I work out how many pizzas to order?
Multiply your guest count by slices per person, then divide by the slices in one pizza and round up. A large usually has 8 slices, a medium 6, and an extra-large 10. For 30 people at 3 slices each, that is 90 slices, or 11.25 large pizzas, so order 12.
How should I split toppings for a group?
A safe default is 40 percent cheese, 30 percent pepperoni, and 30 percent of one other choice such as sausage or veggie. Cheese is the pizza nobody refuses, so keep it the largest share when you do not know the group.
Are large pizzas a better deal than mediums?
Usually. A 14 inch large has about 154 square inches of pizza and a 12 inch medium has about 113, so the large gives you 36 percent more food, usually for less than 36 percent more money. Coupons on mediums can flip that, so compare cost per square inch before a big order.
Put the calculator on your site
Team pages, church bulletins, PTA sites, and party blogs can embed the calculator for free with one line of HTML.
Get the embed code