Pizza Area Comparison Calculator
Compare two pizza sizes by actual area and price per square inch to see which round pizza is really the better deal.
How it works
Area = π × (diameter ÷ 2)² · Price per in² = price ÷ area
A pizza’s food value scales with its area, which grows with the square of the diameter — so a 16-inch pizza has roughly 1.8× the area of a 12-inch one, not 1.3×. Comparing price per square inch removes the illusion that a slightly bigger pizza is only slightly more food. The lower price-per-square-inch pizza is the better deal even when its sticker price is higher.
Worked example
A 12-inch pizza has area π × 6² = 113.1 in²; at $14 that is $0.124/in². A 16-inch pizza has area π × 8² = 201.1 in²; at $20 that is $0.099/in². The 16-inch pizza is the better value despite costing $6 more.
Sources: Area of a circle — Wikipedia
Frequently asked questions
Why is a bigger pizza usually a better deal?
Because area grows with the square of the diameter. Going from a 12-inch to a 16-inch pizza increases the diameter by only a third but nearly doubles the amount of pizza, so the price rarely rises as fast as the food does.
Does this account for crust?
No — it compares total surface area. A thick or stuffed crust eats into usable topping area, so two pizzas with the same diameter can still differ in edible pizza. Use area as a first-pass comparison.
What if only one price is entered?
With a missing or zero price the tool cannot compute price per square inch, so it simply reports which pizza is larger by area instead.
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This calculator is for educational purposes. Double-check important results before acting on them.