Pizza Size Comparison Calculator

Area = pi x r^2. An 18-inch pizza has an area of about 254 sq inches, while two 12-inch pizzas total only about 226 sq inches. The 18-inch pizza gives you 12% more pizza! This is because area grows with the square of the diameter, not linearly.

Almost always the largest size. Larger pizzas cost relatively less per square inch because the dough, labor, and oven space don't increase proportionally. A typical 18-inch pizza costs 30-50% more than a 12-inch but delivers 125% more pizza.

A typical 10-inch pizza has 6 slices, a 12-inch has 8, a 14-inch has 10, a 16-inch has 12, and an 18-inch has 12-14 slices. But the slices on larger pizzas are themselves much bigger!