The calculator takes three inputs (group size, appetite, and pizza size) and returns the exact number of pizzas to order. It always rounds up so you never run short.
Worked example: 16 people at normal appetite (3 slices each) ordering large pizzas (10 slices): 16 x 3 = 48 total slices. ceiling(48 / 10) = 5 pizzas. Leftover: 50 - 48 = 2 slices.
If you are also calculating the cost of ingredients for homemade pizza, the Recipe Cost Calculator handles ingredient totals and cost per serving.
Pizza area scales with the square of the radius, so the jump from medium to large is larger than the slice count difference suggests. A 14-inch large has 54% more surface area than a 12-inch medium, even though it is only 2 extra slices in most shops.
| Size | Diameter | Slices | Area (sq in) |
|---|---|---|---|
| Small | 10 in | 6 | 78.5 |
| Medium | 12 in | 8 | 113.1 |
| Large | 14 in | 10 | 153.9 |
| XL / Party | 16 in | 12 | 201.1 |
Size and slice counts vary by pizzeria. Always confirm the slice count when ordering if precision matters. For making pizza at home, the Pizza Dough Calculator calculates flour, water, and yeast quantities by pizza size and count.