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Pizza Size Comparison Calculator

Compare pizza sizes by area and value — two smalls are usually not one large.

Enter values

Results update as you type.

Result

Better value

Option B

Area grows with the square of diameter — an 18-inch pizza has more than twice the area of a 12-inch.

Option A area
1,414 cm²
Option B area
1,590 cm²
Option A cost per 100 cm²
$1.698
Option B cost per 100 cm²
$1.258
Area difference
12.5%
Saving with the better option
$7.00

About the Pizza Size Comparison Calculator

Compare pizza sizes by area and value — two smalls are usually not one large.

Also known as: pizza value calculator, is a large pizza better value, pizza area comparison, pizza size math.

How to use this calculator

  1. Enter pizza a diameter, pizza a price, how many of a, pizza b diameter and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

area = π × (diameter ÷ 2)² · value = price ÷ area

Worked example

Using the values pre-filled in the calculator above:

  • Pizza A diameter = 30 cm
  • Pizza A price = 12
  • How many of A = 2
  • Pizza B diameter = 45 cm
  • Pizza B price = 20
  • How many of B = 1

the calculator returns:

  • Better value: Option B
  • Option A area: 1,414 cm²
  • Option B area: 1,590 cm²
  • Option A cost per 100 cm²: 1.7