How does this compare pizza sizes?

It calculates the area of different diameter pizzas (area = π × radius²) to show which size offers more actual pizza for the price.

Why is a 16-inch pizza more than twice the size of an 8-inch one?

Because area scales with the square of the radius, doubling the diameter actually quadruples the area, not just doubles it.

How can this help with pizza ordering decisions?

Comparing price-per-square-inch across sizes often reveals that one larger pizza is a better value than two smaller ones.

Pizza Size Comparison Calculator

Compare two pizzas by size and price to find the better value.

Pizza A Diameter (inches)

Pizza A Price ($)

Pizza B Diameter (inches)

Pizza B Price ($)

Pizza A Area / Price per sq in -

Pizza B Area / Price per sq in -

Better Value -

What Is the Pizza Size Comparison Calculator?

Pizza area grows with the square of the radius, so a pizza that's twice as wide has roughly four times the area — not twice. This calculator compares two pizzas' price per square inch to reveal which one is actually the better deal.

Area grows with the square of the radius — a bigger pizza is often better value

Formula Used

Area = π × (Diameter ÷ 2)²
Price per sq in = Price ÷ Area

Lower price-per-square-inch means better value. This ignores toppings and crust differences, but is a solid baseline comparison for plain size vs. price.

How to Use This Calculator

Enter Pizza A's diameter in inches and its price.
Enter Pizza B's diameter in inches and its price.
Click Calculate to see which pizza gives more for your money.

Worked Example

A 12-inch pizza for $12 has an area of π×6² ≈ 113.1 sq in, costing about $0.106/sq in. A 16-inch pizza for $18 has an area of π×8² ≈ 201.1 sq in, costing about $0.090/sq in — the larger pizza is the better value despite costing more overall.