Because area grows with the square of the diameter, bigger pizzas usually give much more food per dollar.
How to use the Pizza Size Comparison Calculator
- Pizza A diameter
- Pizza A price
- Pizza B diameter
- Pizza B price
Results update as you type, and every field accepts the units shown in its menu.
How it works
Compute each pizza’s area from its diameter and divide the price by it.
Inputs explained
| Field | What to enter |
|---|---|
| Pizza A diameter | In in |
| Pizza A price | Amount in your currency |
| Pizza B diameter | In in |
| Pizza B price | Amount in your currency |
What each result means
- Area of A = pi×([Pizza A diameter]÷2)^2
- Area of B = pi×([Pizza B diameter]÷2)^2
- A price per in² = [Pizza A price]÷[Area of A]
- B price per in² = [Pizza B price]÷[Area of B]
- B gives more pizza per money by = ([A price per in²]÷[B price per in²] – 1)×100
Example values
How the main result changes when Pizza A diameter changes and everything else stays at the example values above:
| Pizza A diameter (in) | B gives more pizza per money by (%) |
|---|---|
| 6 | 374.1 |
| 9 | 110.7 |
| 12 | 18.5 |
| 15 | -24.1 |
| 18 | -47.3 |
| 24 | -70.4 |
Formula
Area = π × (diameter ÷ 2)²Value = price ÷ areaWorked example
Inputs — Pizza A diameter: 12 in; Pizza A price: $12; Pizza B diameter: 16 in; Pizza B price: $18.
Results — Area of A = 113.1 in²; Area of B = 201.1 in²; A price per in² = $0.1061; B price per in² = $0.0895; B gives more pizza per money by = 18.5 %.
Frequently asked questions
Are two medium pizzas better than one large?
Usually not; compare by area.
Does crust count?
This counts the whole pizza; thick crust edges reduce the topped area.
What formula does the Pizza Size Comparison Calculator use?
Area = π × (diameter ÷ 2)².