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.
A 14 inch large pizza holds about 154 square inches of food, which is 36 percent more than a 12 inch medium, even though it is only 2 inches wider. To find the best value, divide each size's price by its area and choose the size with the lowest cost per square inch.
Pizza sizes by diameter and area
Menus list pizzas by diameter, but the amount of food depends on area. The area of a circle is π × r², where r is the radius, or half the diameter. A 14 inch pizza has a 7 inch radius, so its area is 3.1416 × 7 × 7, which comes to about 154 square inches.
| Diameter | Radius | Area (square inches) | Compared with a 12 inch pizza |
|---|---|---|---|
| 10 inches | 5 inches | 79 | 69% |
| 12 inches | 6 inches | 113 | 100% |
| 14 inches | 7 inches | 154 | 136% |
| 16 inches | 8 inches | 201 | 178% |
| 18 inches | 9 inches | 254 | 225% |
Size names are less consistent than diameters. Most national chains sell a 10 inch small, a 12 inch medium, a 14 inch large, and a 16 inch extra-large. Domino's, for example, lists exactly those four diameters in its nutrition guide. Independent pizzerias set their own sizes, so a large at a local shop could be 16 or 18 inches. Check the inches on the menu before you compare prices.
Why a 2 inch jump matters more than it sounds
Area grows with the square of the radius. When the diameter goes up by 2 inches, the radius goes up by 1 inch, and that extra inch runs around the entire circle. Here is what each step adds:
- Going from 10 to 12 inches adds about 35 square inches, which is 44 percent more pizza.
- Going from 12 to 14 inches adds 41 square inches, which is 36 percent more pizza.
- Going from 14 to 16 inches adds 47 square inches, which is 31 percent more pizza.
- Going from 16 to 18 inches adds 53 square inches, which is 27 percent more pizza.
A 14 inch pizza is only 17 percent wider than a 12 inch pizza, yet it holds 36 percent more food. A 14 inch large has 96 percent more area than a 10 inch small, so one large holds nearly as much as two smalls.
Area also explains some surprising comparisons. Two 12 inch mediums add up to 226 square inches, which is more than one 16 inch extra-large at 201 square inches. One 18 inch pizza, at 254 square inches, beats both.
Crust edge versus topping area
Total area includes the outer crust, which usually has no sauce or cheese. Suppose your pizzeria leaves a 1 inch bare rim. The topped part of the pizza is then a circle 2 inches smaller than the whole pie, so a 14 inch pizza has the same topped area as an entire 12 inch pizza.
| Pizza | Total area | Topped area with a 1 inch rim | Share that is plain crust |
|---|---|---|---|
| 12 inches | 113 | 79 | 31% |
| 14 inches | 154 | 113 | 27% |
| 16 inches | 201 | 154 | 23% |
Because the rim takes up a smaller share of a bigger pie, each size step adds more cheese and toppings than the total area suggests. A 16 inch pizza has 31 percent more total area than a 14 inch pizza, but it has 36 percent more topped area. Crust width varies by shop and style, so treat the 1 inch rim as an example.
How to compare cost per square inch
Divide the price of each pizza by its area. The result tells you how much you pay for every square inch of pizza, and the lowest number is the best value.
Suppose a medium costs $12, a large costs $15, and an extra-large costs $18. These are hypothetical prices for illustration only.
| Size | Hypothetical price | Area | Cost per square inch |
|---|---|---|---|
| Medium, 12 inches | $12 | 113 | 10.6 cents |
| Large, 14 inches | $15 | 154 | 9.7 cents |
| Extra-large, 16 inches | $18 | 201 | 9.0 cents |
In this example, the large costs $3 more than the medium and adds 41 square inches, so each extra square inch costs about 7 cents. The extra-large costs another $3 for 47 more square inches, or about 6 cents per extra square inch. The bigger pizza wins here because the price rises by a smaller percentage than the area does. That pattern is common, but it is not guaranteed, so run the numbers with your own shop's menu.
The tool below does the division for you. Type in your pizzeria's prices for a medium, a large, and an extra-large to see the cost per square inch of each size.
Enter your pizzeria's prices. The sizes are editable if your shop measures differently.
| Size | Diameter | Price | Cost per sq in |
|---|---|---|---|
| Medium | in | $ | |
| Large | in | $ | |
| X-Large | in | $ |
Add at least two prices to see which size is the better deal.
If you want a quick estimate without a tool, use two ratios. A 12 inch medium has about 73 percent of the area of a 14 inch large, and a 16 inch extra-large has about 131 percent. With a $15 large, a medium is the better value at any price under about $11, and an extra-large is the better value at any price under about $19.60.
When a medium deal beats a large
The example above uses regular menu prices. Deals and coupons can flip the result, and so can your actual appetite.
Suppose a shop offers two mediums for $18. You get 226 square inches for 8.0 cents per square inch, which beats both the $15 large and the $18 extra-large from the example above. You also get two different toppings instead of one.
A single discounted medium can also win. If a medium drops to $8 while the large stays at $15, the medium costs 7.1 cents per square inch and the large costs 9.7 cents. Order the medium if it is enough food.
A lower cost per square inch saves nothing if the extra pizza goes in the trash. If a medium feeds everyone at the table and nobody wants leftovers, the medium is the cheaper order.
Variety can matter more than value, too. For a group of picky eaters, two mediums with different toppings may go over better than one large with a topping nobody chose.
Pizza size and slice count
A bigger pizza usually has more slices, but slice counts depend on how the shop cuts the pie. Many shops cut a 16 inch pizza into 10 slices, while others cut it into 12 smaller slices. The number of slices does not change the amount of food, which is set by area. Our guide on how many slices are in a pizza covers cutting styles in more detail.
When you order for a group, start with how many slices people will eat and then choose a size. The pizza calculator counts a medium as 6 slices, a large as 8, and an extra-large as 10, and it rounds up so you do not run short. For example, 20 average adults at 3 slices each need 60 slices, which is 8 large pizzas or 6 extra-large pizzas. If you are feeding a crowd, the guide to how much pizza per person explains the appetite estimates behind that math.
Quick rules for choosing a size
- Compare sizes by area. Between 10 and 18 inches, each 2 inch step in diameter adds roughly 25 to 45 percent more pizza.
- Divide price by area to get cost per square inch, and choose the lowest number.
- Expect bigger pizzas to be the better value at regular prices, but check the prices on your menu.
- Recheck the math whenever a coupon or multi-pizza deal is involved, because a medium deal can beat a large.
- Order the amount of food your group will eat, because you still pay for pizza that gets thrown away.
Sources
- Domino's Pizza, Domino's Nutrition Guide, January 2026. The guide lists Small (10"), Medium (12"), Large (14"), and Extra Large (16") pizzas.