Pizza Size Calculator
Find Out Which Pizza Size Gives You the Most for Your Money
🍕 Pizza 1
🍕 Pizza 2
About the Pizza Size Calculator
The Pizza Size Calculator compares two pizzas of different sizes and prices to determine which offers better value per unit area. This is a surprisingly non-obvious calculation — because pizza area grows as the square of the radius (not linearly with diameter), a pizza that is twice the diameter has four times the area, not twice. This means that a 40 cm pizza is not twice the size of a 20 cm pizza — it contains four times as much pizza. The practical implication: larger pizzas almost always offer better value per cm² than smaller ones, even when they appear disproportionately more expensive. Promotional 'personal size' or 'medium' pizzas are frequently poor value compared to a large pizza shared between two people. This calculator removes the guesswork by computing the exact area of each pizza (using πr²) and dividing the price by the area to produce a cost-per-cm² comparison, making it easy to identify the better deal.
How Pizza Value is Calculated
Pizza area is calculated using the circle area formula: Area = π × (diameter ÷ 2)². Cost per unit area = Price ÷ Area. The pizza with the lower cost per cm² (or per in²) offers better value. For example: Pizza A — 30 cm, €8. Area = π × 15² = 706.9 cm². Cost/cm² = €0.0113. Pizza B — 40 cm, €13. Area = π × 20² = 1,256.6 cm². Cost/cm² = €0.0103. Pizza B offers better value despite costing €5 more.
Frequently Asked Questions
Yes — a larger pizza with more dough, cheese, and toppings will contain more calories proportional to its area. If you're comparing pizzas of the same style and thickness, calorie content scales approximately with area. Two people splitting a large pizza will consume similar total calories to each eating a medium pizza of the same style, but at better value per serving.
This calculator compares area only (2D comparison), not volume. If one pizza is noticeably thicker, the thicker pizza contains more total food per cm² of surface area, so the cost-per-cm² comparison understates its value. For pizzas of similar style (both thin crust or both deep dish), the area comparison is a good proxy for total quantity.
No — this calculator uses the circle area formula (πr²) and is designed for round pizzas only. For rectangular pizzas (such as Roman-style or Sicilian), use length × width to compute the area, then divide by price to compare value.
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