A 20 inch pizza is a popular extra-large pizza size that’s perfect for feeding a group. Many independent pizzerias and regional pizza chains offer 20 inch pizzas for family dinners, office lunches, birthday parties, and game-day gatherings. With its generous size, one pizza can often replace two smaller pizzas while giving everyone plenty of slices.
If you’re wondering how many slices a 20 inch pizza has, how many people it serves, or how it compares to other pizza sizes, this guide explains everything you need to know. The measurements below are based on standard pizza geometry and common serving practices. Keep in mind that slice counts, crust thickness, and toppings can vary slightly by restaurant.
20 Inch Pizza Size Chart
| Measurement | Standard Size |
|---|---|
| Diameter | 20 inches (50.8 cm) |
| Radius | 10 inches (25.4 cm) |
| Surface Area | About 314 sq in (2,027 sq cm) |
The surface area is calculated using the formula πr². A 20 inch pizza provides approximately 314 square inches of pizza, making it substantially larger than a standard large pizza.
How Many Slices Are in a 20 Inch Pizza?
Most restaurants cut a 20 inch pizza into 12 slices, although some pizzerias may offer 16 party-style slices.
| Cut Style | Number of Slices |
|---|---|
| Standard Cut | 12 slices |
| Party Cut | 16 slices |
| Large Cut | 10 slices |
A 12-slice cut is common because it creates large slices that are easy to share while maintaining generous portions.
How Many People Does a 20 Inch Pizza Feed?
A 20 inch pizza typically serves 6 to 8 people, depending on appetite and whether side dishes are included.
A general serving guide is:
- 4–5 people: Large meal with leftovers.
- 6 people: Comfortable dinner with 2 slices each.
- 8 people: Light meal when served with salad, wings, or appetizers.
If pizza is the main course, most adults eat 2 to 3 slices.
How Big Is a 20 Inch Pizza Compared to Other Sizes?
Pizza size increases much faster than the diameter because the total surface area grows exponentially.
| Pizza Size | Surface Area |
|---|---|
| 16 inch | 201 sq in |
| 18 inch | 254 sq in |
| 20 inch | 314 sq in |
A 20 inch pizza has approximately 24% more pizza than an 18 inch pizza. Compared to a 16 inch pizza, it offers about 56% more pizza, making it an excellent value for larger groups.
How Much Does a 20 Inch Pizza Weigh?
The overall weight depends on the crust style, cheese, and toppings.
Typical weight ranges include:
- Thin crust: 40–55 ounces (1.1–1.6 kg)
- Hand-tossed crust: 50–70 ounces (1.4–2.0 kg)
- Thick crust or pan pizza: 65–90 ounces (1.8–2.6 kg)
Extra cheese, multiple meats, and specialty toppings can increase the weight considerably.
How Many Calories Are in a 20 Inch Pizza?
Calorie counts vary depending on the recipe, crust, and toppings.
For a standard cheese pizza:
- Entire 20 inch pizza: 3,800–5,600 calories
- One slice (12 slices): 320–470 calories
Specialty pizzas with stuffed crust or extra cheese may contain significantly more calories.
Always check the restaurant’s nutrition information if you need exact calorie values.
Is a 20 Inch Pizza Enough for a Party?
Yes. A 20 inch pizza is an excellent choice for birthday parties, office lunches, family gatherings, and sports events.
It comfortably feeds six adults as a full meal and can serve even more people when paired with salads, wings, breadsticks, or desserts.
For larger events, ordering multiple pizzas with different toppings gives guests more variety.
Best Times to Order a 20 Inch Pizza
A 20 inch pizza works well for many occasions.
It’s especially popular for:
- Birthday parties
- Family gatherings
- Office meetings
- Game-day celebrations
- Movie nights
- School events
Its generous size makes serving a crowd easier while reducing the number of pizza boxes needed.
Tips for Choosing the Right Pizza Size
Before ordering, estimate how many slices each guest will eat.
If pizza is the only meal, plan on 2 to 3 slices per adult. If you’re serving several side dishes, one 20 inch pizza can stretch further.
For groups larger than eight adults, consider ordering two pizzas with different toppings to provide enough food and more variety.
Conclusion
A 20 inch pizza is an excellent choice for feeding families and large groups. With a diameter of 20 inches and a surface area of approximately 314 square inches, it delivers significantly more pizza than standard large sizes while remaining easy to slice and serve.
Whether you’re planning a party, organizing an office lunch, or hosting a family gathering, understanding the size, serving capacity, slice count, and calorie range helps you order the right amount and keep everyone satisfied.
FAQs
How many slices are in a 20 inch pizza?
Most 20 inch pizzas are cut into 12 slices. Some restaurants also offer 16 smaller party slices.
How many people does a 20 inch pizza serve?
A 20 inch pizza typically serves 6 to 8 people, depending on appetite and whether side dishes are included.
Is a 20 inch pizza much larger than an 18 inch pizza?
Yes. A 20 inch pizza has about 314 square inches of surface area, which is approximately 24% more pizza than an 18 inch pizza.
How many calories are in a 20 inch cheese pizza?
A typical 20 inch cheese pizza contains between 3,800 and 5,600 calories in total. The exact amount depends on the crust, cheese, and toppings.
Is one 20 inch pizza enough for six adults?
Yes. One 20 inch pizza is usually enough for six adults, especially when served with appetizers, salad, or other side dishes.
