How Big is a 20 Inch Pizza?

If you’re having several guests for dinner or putting on a pizza party, you’ll want to figure out how much to get. In the event it’s for eight people or less, one or two medium-sized pizzas should suffice. But, if you’re having 10 or more people, you’re going to want a ginormous size, like 20 inches. So, how big is a 20 inch pizza?

If you’re referring to the pizza’s shape in being a circle or square, then this will vary. You can think of a circular 20-inch pizza similar to a typical vehicle wheel. For squares, it’s nearly the size of a large poster. With either, they can feed at least 10 people.

Of course, we’ll get more technical and mathematical about the size of a 20-inch pizza. But this answer intends to give you an initial picture that you can relate to. At the very least, it should allow you to visualize how much pizza you’ll need to feed a large group of people.


For a more mathematical understanding, there is a staunch difference in size when you’re comparing a circular pizza to a square one. A circular 20-inch pizza has a total surface area of 314 square inches or 2.182 square feet. In other words, you can get 12 standard slices out of it.

But, if you’re having a square-shaped pizza, then it should measure 20 inches by 20 inches. This means it will have a total surface area of 400 square inches or 2.7778 square feet. Therefore, you should be able to cut anywhere from 15 to 16 slices.

The shape alone will be a major factor in determining how big is a 20 inch pizza. So, you can figure on feeding five to six adults or eight to 10 children with a circular one. You can estimate 10 to 12 adults or 12 to 15 children with a square pizza..

How big is a 20 inch pizza?

Opting for Other Sizes

However, a 20-inch pizza is a monstrous size. In fact, there aren’t many pizza parlors that will offer this on their menu. To illustrate, the largest size you can get a place like Pizza Hut or Domino’s is 14 inches and that’s the largest they offer.  So, you might consider doubling up on smaller sizes to equate 20 inches.

However, the surface area of a 20-inch round pizza is four times larger than a 10-inch. Ergo, you’re actually getting less food if you go with two 10-inch pizzas.

Oping for two 12 or 18 inch pizzas might be better in this instance. These will supply a total surface area of 226 or 254 square inches, respectively. But 12-inch pizzas only provide eight slices while 18 inches provide up to 10 slices of pizza.

Amount of Pizza versus Number of People

The number of people and their level of hunger are yet other determining factors in understanding how big is a 20 inch pizza. On average, guesstimate that each person will have at least two slices. Review the table provided below for a quick reference. However, this is only a guideline and you should refer to the shape of the pizza as well.

AdultsNumber of PizzasChildrenNumber of Pizzas

Where to Get a 20-Inch Pizza

There aren’t many pizzerias offering 20 inch pizzas. The largest size is often 14 or 16 inches, which most people call “extra large.” Therefore, if you want a 20-inch pizza, you may have to make it yourself. However, the following are some locations around the US where you can find it:

  • The Pizza Joint (El Paso, TX)
  • Brozinni Pizzeria (Indianapolis, IN)
  • Mountain Mike’s Pizza (throughout southern California)
  • Valentino’s New York Style Pizza (Manassas, VA)
  • Mickey’s Deli (Hermosa Beach, CA): they offer a whole slice that’s 20 inches
  • Lazy Moon Pizza (Orlando, FL)
  • Ian’s Pizza (Milwaukee, WI)
  • Dante’s Pizza (Chicago, IL)
  • Eddie ; Sam’s NY Pizza (Tampa, FL)
  • Antonio’s Pizza (New York City, NY)

How to Make a 20-Inch Pizza

If you don’t have a pizza parlor in your area that makes a 20-inch, you can always bake it yourself. But this may be difficult if you’re trying to feed a large group people. But, if it’s just for you and your family, it’s quite manageable.

You will need a 20-inch round pan or a 20-inch square baking sheet. If you buy a pizza kit, make sure it can accommodate the size. Once you have your items and pizza ingredients, start by warming up your oven to 400°F (200°C).

The Crust ; Toppings

Then it’s time to make the crust. You can either make this from scratch with your favorite recipe but you can buy premade dough or a pizza kit. Some people like to use yeast while others prefer baking powder. However, yeasted dough tastes and crisps much better.

Oil or grease your pizza pan and stretch the dough over it. Next, add your sauce and top that with the cheese of your choice. Follow this with other toppings you want on it.

Baking ; Cutting

Put the pizza in the oven to bake for about 20 minutes. You want to ensure the crust gets golden brown with the cheese melted and bubbling. Take it out, let it cool for five minutes and then slice it into eight to 10 pieces.


So, if you want to know how big is a 20 inch pizza, it will depend on if the pizza’s shape is square or a circle. Squares will offer more surface area, allowing you to feed up to 12 adults and/or 15 children. But, a circular pizza will feed about six adults and up to 10 children.

This is because the total surface area of a circular pizza is 314 square inches. The square style pizza will have about 400 square inches, which means you can feed more people.

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Sam Brett

Sam Brett is the founder and editor of Pizzachefhq, a pizza enthusiast who writes about what he's learned on the way of being a pizza creator and sharing his advice, tips, and research.

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