Pizza menus list sizes by name: small, medium, large, extra large. A few places add a personal size.
The problem is that these names hide what actually matters: how much pizza you get. A large is not just "a little bigger" than a medium. It is a lot bigger. And an extra large is not just "a little bigger" than a large. The math is not intuitive, and that is why most people order the wrong size.
Standard pizza sizes
Most pizza chains in the US follow the same sizing conventions. There are exceptions, but here is what you will find at most places.
| Size | Diameter | Typical Slices | |------|----------|---------------| | Personal | 8 inches | 4 | | Small | 10 inches | 6 | | Medium | 12 inches | 8 | | Large | 14 inches | 8-10 | | Extra Large | 16 inches | 10-12 |
Some chains skip certain sizes. Little Caesars sells 14-inch large pizzas. Pizza Hut does not always offer an extra large. Domino's and Papa John's offer the full range from small through extra large. Slice counts also vary by chain and cut style, so check our guide on how many slices are in a pizza for the chain-by-chain breakdown.
The diameter is a starting point. But the real story is in the area.
Why two inches makes a huge difference
Pizza is a circle. The area of a circle is π times the radius squared. That "squared" part is what catches people off guard.
Here is every standard size, with its actual area in square inches:
| Size | Diameter | Radius | Area (sq in) | |------|----------|--------|-------------| | Personal | 8" | 4" | 50 | | Small | 10" | 5" | 79 | | Medium | 12" | 6" | 113 | | Large | 14" | 7" | 154 | | Extra Large | 16" | 8" | 201 |
Now look at the jumps between sizes:
- Small to medium: 43% more pizza (79 → 113 sq in)
- Medium to large: 36% more pizza (113 → 154 sq in)
- Large to extra large: 31% more pizza (154 → 201 sq in)
- Small to large: 96% more pizza (79 → 154 sq in)
That last one is the number people never believe. A 14-inch large pizza has nearly double the area of a 10-inch small. It is not 40% more. It is not 50% more. It is ninety-six percent more. You are getting almost two small pizzas worth of food in one large.
This is why ordering two smalls instead of one large almost never makes sense unless you have a coupon.
Price per square inch: the number that actually matters
Forget the price on the menu. The number you should care about is price per square inch. That tells you how much pizza you are getting for every dollar.
Here is a realistic example using average national chain prices for a cheese pizza:
| Size | Price | Area | Price Per Sq In | |------|-------|------|----------------| | Personal (8") | $6 | 50 sq in | $0.120 | | Small (10") | $9 | 79 sq in | $0.114 | | Medium (12") | $11 | 113 sq in | $0.097 | | Large (14") | $14 | 154 sq in | $0.091 | | Extra Large (16") | $17 | 201 sq in | $0.085 |
The pattern is consistent. Every step up in size drops the cost per square inch. The extra large gives you 30% more value per dollar compared to the personal size.
Put another way: upgrading from a medium to a large costs about $3 more but gives you 41 extra square inches of pizza. That is like getting an extra slice and a half for $3. Upgrading from a large to an extra large costs another $3 for 47 more square inches.
The bigger the pizza, the better the deal. This holds true at almost every pizza shop because the main cost is labor and overhead, not the extra dough and cheese on a larger pie. For a detailed side-by-side analysis of the two most popular sizes, see our breakdown of large vs. XL pizza and which is the better deal.
Chain-by-chain size comparison
Not every chain uses the same dimensions. Here is how the four biggest national chains compare.
Domino's
| Size | Diameter | Slices | Crust Options | |------|----------|--------|--------------| | Small | 10" | 6 | Hand Tossed | | Medium | 12" | 8 | Hand Tossed, Thin Crust | | Large | 14" | 8 | All crusts | | Extra Large (Brooklyn Style) | 16" | 6 large slices | Brooklyn Style only |
Domino's extra large is their Brooklyn Style, cut into 6 oversized foldable slices instead of 10 or 12. It has the same area but a different eating experience.
Pizza Hut
| Size | Diameter | Slices | |------|----------|--------| | Medium | 12" | 8 | | Large | 14" | 8 |
Pizza Hut has simplified their menu in recent years. They do not offer a small or extra large at every location. The large is their default value size.
Papa John's
| Size | Diameter | Slices | |------|----------|--------| | Small | 10" | 6 | | Medium | 12" | 8 | | Large | 14" | 8 | | Extra Large | 16" | 10 |
Papa John's offers the most consistent sizing across all four standard sizes.
Little Caesars
| Size | Diameter | Slices | |------|----------|--------| | Classic (Hot-N-Ready) | 14" | 8 | | Deep! Deep! Dish | Rectangular | 8 (square cut) |
Little Caesars keeps it simple. Their standard Hot-N-Ready is a 14-inch large. They do not offer a small, medium, or extra large on the regular menu. The ExtraMostBestest is the same 14-inch size with more cheese and toppings.
What this means for you
A "large" means the same thing at every major chain: 14 inches. That is good news. When comparing prices across chains, you are comparing the same amount of pizza.
Where things diverge is at the edges. If you want an extra large, Domino's and Papa John's are your options among the big four. If you want a small for a solo meal, skip Little Caesars and Pizza Hut.
When to order each size
Personal (8") - Solo snack
For one person who wants a few slices, not a full meal. You are paying the worst per-square-inch rate, so only order this size when you do not want leftovers.
Small (10") - Solo meal
Enough for one hungry person with no leftovers, or one moderate eater with a slice or two for later. The value is still not great, but you are not wasting food.
Medium (12") - Date night or duo
Feeds two people. Four slices each is a solid meal. The per-square-inch cost starts to become reasonable here.
Large (14") - The default
This is the size you should order unless you have a specific reason not to. It feeds 3 to 4 people, the value is strong, and it is available everywhere. If you are ordering for yourself and want leftovers, this is also your best bet.
Extra Large (16") - Groups of 4+
Feeds 4 to 5 people. Best value per square inch. For parties, order in extra large whenever possible and supplement with a medium for variety. Two extra larges (402 sq in) cost less than three larges (462 sq in) at most places, and you only give up 60 square inches.
The quick rule
If you remember one thing from this guide, remember this: go up one size from whatever you were going to order. You will pay a little more, but you will get a lot more pizza. The math always favors the bigger pie.