Pizza Size Comparison Calculator
Compare any two pizza sizes by price per square inch.
Find out which pizza is the better deal — small, medium, or large.
Why Pizza Math Surprises Almost Everyone
Most people assume that a pizza with a diameter twice as large costs roughly twice as much for twice the pizza. This intuition is completely wrong — and understanding why saves you real money every time you order.
Pizza is a circle. The area of a circle is calculated as Area = π × r², where r is the radius (half the diameter). Because area grows with the square of the radius, even a modest increase in diameter produces a dramatically larger pizza.
A Concrete Example
Compare a 12-inch pizza to a 16-inch pizza:
- 12-inch area = π × 6² = 113 square inches
- 16-inch area = π × 8² = 201 square inches
The 16-inch pizza has 78% more pizza than the 12-inch pizza — almost twice as much. If the 12-inch costs $12 and the 16-inch costs $17, the larger pizza is easily the better deal.
Price Per Square Inch: The Right Metric
The only fair way to compare two pizzas is price divided by area — the cost per square inch (or per square centimeter). A pizza with a lower cost per square inch gives you more food for your money, period. This calculation strips away the distraction of the absolute price and shows you the true value.
What About Toppings?
One common objection is that toppings don’t scale perfectly with area — a larger pizza sometimes has a thinner topping density if the pizzeria doesn’t adjust quantities. If topping coverage matters to you, inspect the pizza before ordering large quantities, or ask the restaurant if they scale their toppings proportionally.
When Does the Larger Size Win?
The larger size almost always wins on value per square inch — which is why pizzerias price them the way they do. The dough, oven time, and box cost don’t scale linearly with size, so the marginal cost of making a larger pizza is relatively small. The tipping point where large becomes a significantly better deal is usually around a 20–30% price premium for a 33%+ size increase.
Understanding this math also applies to buying round pans, pies, cakes, and any other circular food or product where size comparisons matter.