What this calculator does
Pizza & round-item value works out area per dollar: the honest way to compare sizes. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaArea = π(d/2)²; value = area / price. Doubling the diameter quadruples the pizza
The inputs explained
| Field | What to enter |
|---|---|
| Pizza A: diameter (in) | A number, measured in in. Starts at 9. |
| Pizza A: price ($) | A number, measured in your currency. Starts at 14. |
| Pizza B: diameter (in) | A number, measured in in. Starts at 13. |
| Pizza B: price ($) | A number, measured in your currency. Starts at 22. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with pizza a: diameter
Every other input is held at the calculator’s starting values while pizza a: diameter varies. Select any row to load that scenario into the calculator.
How the answer changes with pizza a: diameter