Pizza Size Calculator

area = pi x radius squared, and the radius is half the number on the menu. A 12 inch pizza is 113 square inches. An 18 inch is 254. The width went up by half, the pizza went up by 125 percent, because area scales with the square of the diameter. Price per square inch is the total price divided by the total area. That is the only honest way to compare two sizes, and it is why two mediums almost never beat one large.

Is one large pizza bigger than two mediums?

Usually yes in value and no in area. Two 12 inch pizzas are 226 square inches against 254 for a single 18 inch, so the 18 inch wins outright. Against two 14 inch pizzas at 308 square inches the two mediums are more food, but they normally cost more too.

How much bigger is an 18 inch pizza than a 12 inch?

It is 2.25 times the pizza. The diameter is 1.5 times larger and area scales with the square, so 1.5 x 1.5 gives 2.25. You are getting more than twice the food for a price that is rarely double.

How many pizzas do I need for 10 people?

Roughly three 14 inch pizzas at 3 slices per person, which is 30 slices from 24 to 30 available. Order one extra if there are teenagers, if there is no side, or if the group skews toward big eaters.

How many slices are in each pizza size?

Typically 6 on a 10 inch small, 8 on a 12 or 14 inch, 10 on a 16 or 18 inch and 12 on anything larger. Cutting a pizza into more slices does not create more pizza, it only makes each slice smaller.

Why is the bigger pizza almost always cheaper per inch?

The box, the labor, the delivery and the oven time are nearly the same whatever the size, so only the dough and toppings scale. Those fixed costs are spread over far more pizza on a large one.

Is a square or a round pizza better value?

Compare the areas. A round 16 inch pizza is 201 square inches. A square 16 inch pizza is 256, so it is about a quarter more food for the same stated size. The corners are the reason.