Pizza Size & Value Calculator
By Santaji GadepatilinUpdated October 27, 2026
Pizza area grows with the square of the diameter, so a larger pizza is often much better value than it looks. This free pizza size & value calculator solves for whichever value you leave blank and shows the formula and steps.
How to use the pizza size & value calculator
Enter the diameter and price of two pizzas. Their areas are calculated, plus how much more pizza B gives and how much cheaper it is per square inch.
Example
12-inch for 12 vs 16-inch for 18:
- Areas: 113 in² vs 201 in² — B is 78% bigger
- B is 15.6% cheaper per square inch
Pizza area by size
| Diameter | Area | Equals how many 10-inch pizzas |
|---|---|---|
| 8 in (20 cm) | 50 in² | 0.64 |
| 10 in (25 cm) | 79 in² | 1.00 |
| 12 in (30 cm) | 113 in² | 1.44 |
| 14 in (36 cm) | 154 in² | 1.96 |
| 16 in (41 cm) | 201 in² | 2.56 |
| 18 in (46 cm) | 254 in² | 3.24 |
Why the big pizza is usually better value
Area grows with the square of the diameter. A 16-inch pizza has 78% more pizza than a 12-inch, but is rarely priced 78% higher.
Slices per person
| Size | Slices | Feeds (approx.) |
|---|---|---|
| Small (10 in) | 6 | 1–2 |
| Medium (12 in) | 8 | 2–3 |
| Large (14 in) | 8–10 | 3–4 |
| Extra large (16–18 in) | 10–12 | 4–6 |
Crust matters
A larger pizza has proportionally less crust, so more of the area is topped. For crust lovers, smaller pizzas give more crust per person.
Frequently asked questions
Is one large pizza better than two mediums?
Often yes. One 18-inch pizza (254 in²) has more than two 12-inch pizzas (226 in² together).
Why does a small increase in size matter so much?
Area grows with the square of the diameter — a 16-inch pizza is 78% bigger than a 12-inch.
Is crust included?
Yes, the calculation uses the full diameter.
Is one 16-inch pizza more than two 12-inch pizzas?
No. One 16-inch pizza is about 201 in², while two 12-inch pizzas are about 226 in².
How much bigger is a 14-inch than a 12-inch pizza?
About 36% more area.