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Pizza Size and Value Calculator

Compare two pizza deals by how much pizza you actually get, and the price per square inch, to see which is better value.

Rules last checked 9 November 2026Every step shown

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Better value

Deal A

Deal A per sq in
Rs 9.82
Deal B per sq in
Rs 10.61
Deal A pizza
254 sq in
Deal B pizza
226 sq in

Deal A is better value: 7.4% cheaper for the same amount of pizza. Deal A gives 12.5% more pizza overall.

How it's worked out

  1. Area of one A pizzaπ × (18 ÷ 2)²254.5 sq in
  2. Deal A in total254.5 × 1254.5 sq in
  3. Area of one B pizzaπ × (12 ÷ 2)²113.1 sq in
  4. Deal B in total113.1 × 2226.2 sq in
  5. Price per areaRs 2,500 ÷ 254.5 and Rs 2,400 ÷ 226.2Rs 9.82 and Rs 10.61
Pizza in each deal (sq in)
  • Deal A254.46952.9%
  • Deal B226.194747.1%
  • Area grows with the square of the size: an 18-inch pizza has more than twice the pizza of a 12-inch one. The whole pizza is counted, crust included.

How it is worked out

Area = π × (size ÷ 2)² · Value = price ÷ total area

Each deal's total area is one pizza's area times the number of pizzas. The deal with the lower price per square inch (or square centimetre) gives more pizza for the money.

Worked example

One 18-inch pizza for Rs 2,500 is Rs 9.82 a square inch. Two 12-inch pizzas for Rs 2,400 are Rs 10.61 a square inch. The big pizza is the better deal, even though it costs Rs 100 more.

Questions people ask

Is one 18-inch pizza more than two 12-inch pizzas?

Yes. One 18-inch pizza is 254 square inches; two 12-inch pizzas are 226 square inches together, so the single large pizza has 12.5% more.

How do you work out the area of a pizza?

π × (diameter ÷ 2)². A 12-inch pizza has a radius of 6 inches, so its area is 3.1416 × 36 = 113 square inches.

Why is a large pizza usually better value?

Area grows with the square of the size. Going from 12 to 16 inches makes the pizza 78% bigger, while the price usually rises much less.

Does the calculator count the crust?

Yes: it uses the whole pizza, crust included. If you don't eat the crust, a bigger pizza is even better value, because its crust is a smaller share of the whole.

Formula and rules last checked 9 November 2026Written and tested by the CalculatorDex teamReport a problem