What this calculator does
BBQ grill size works out grilling surface area needed for a cookout, and an equivalent round grill diameter. 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
FormulaGrill area needed = guests × 72 in² per person; round diameter = √(4 × area ÷ π)
The inputs explained
| Field | What to enter |
|---|---|
| Guests | A number. Starts at 12. |
| Area per person (in²) | A number, measured in in². Starts at 72. |
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 guests
Every other input is held at the calculator’s starting values while guests varies. Select any row to load that scenario into the calculator.