Pizza Size Calculator

Pizza area is calculated using the standard circle formula: Area = π × (diameter / 2)². For example, a 10-inch pizza has an area of π × 5² ≈ 78.54 square inches. The diameter is the straight-line measurement across the widest part of the pizza.

A 14-inch pizza has an area of π × 7² ≈ 153.94 square inches. This is nearly double the area of a 10-inch pizza (78.54 in²), even though the diameter is only 40% larger — which is why bigger pizzas are almost always better value.

A 16-inch pizza has an area of π × 8² ≈ 201.06 square inches, making it a large pizza by most pizzeria standards. It's about 30% more pizza than a 14-inch and more than double a 12-inch pie.

The true cost is best measured as price per square inch. Divide the pizza's total price by its area. For example, if a pizza with 78.54 in² costs $8.99, the cost per square inch is roughly $0.1144. This lets you fairly compare pizzas of different sizes.

Because pizza area grows with the square of the radius, doubling the diameter actually quadruples the area. A large pizza has far more edible surface than the size difference in inches suggests, so the cost per square inch typically drops significantly as the pizza gets bigger.

Pizzeria size labels (small, medium, large, XL) vary widely. A 'large' at one chain might be 14 inches while another calls 16 inches large. Always check the actual diameter and use a size calculator to compare true value across different restaurants.

Yes. This calculator assumes a standard round pizza. Square or rectangular pizzas require length × width for area instead. If comparing a round pizza to a square one, you'd need to adjust the calculation — though most pizzeria pies are circular.

Most pizzerias cut small pizzas (8–10 in) into 6 slices, medium (12 in) into 8, large (14–16 in) into 8–10, and extra-large (18 in+) into 10–12 slices. Slice counts vary, so comparing area and price per square inch is a more reliable way to judge value.