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Pizza Size Value Calculator

Work out pizza size value instantly with clear inputs, formula shown and shareable results.

About Pizza Size Value Calculator

Value is price divided by base area, and area is pi times radius squared, so the comparison is made per 100 square centimetres of pizza rather than per centimetre of diameter. Because area grows with the square of diameter, a 40 cm pizza is 1.78 times the food of a 30 cm one, which is why the larger size usually wins on price per bite.

Formulas

Area

area = pi x (diameter / 2)^2

Value

cost per 100 cm2 = price / area x 100

Worked example

With the default values below, Pizza Size Value Calculator returns Better value of Pizza B is better value. Change any input above and every figure here is recalculated in your browser.

Inputs used

Pizza A diameterminimum 1 cm
30 cm
Pizza A priceminimum 0.01
12
Pizza B diameterminimum 1 cm
40 cm
Pizza B priceminimum 0.01
18

Results

Better value
Pizza B is better value
Pizza A cost per 100 cm2
$1.698
Pizza B cost per 100 cm2
$1.432
How many times bigger B is than A
1.778

Step by step

  1. 1Values used
  2. 2Area
  3. 3Value
  4. 4Better value= Pizza B is better value
  5. 5Pizza A cost per 100 cm2= 1.698
  6. 6Pizza B cost per 100 cm2= 1.432
  7. 7How many times bigger B is than A= 1.778

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Pizza Size Value figure worked out?

area = pi x (diameter / 2)^2. Value is price divided by base area, and area is pi times radius squared, so the comparison is made per 100 square centimetres of pizza rather than per centimetre of diameter.

Why does this matter?

Because area grows with the square of diameter, a 40 cm pizza is 1.78 times the food of a 30 cm one, which is why the larger size usually wins on price per bite.

What do I need to enter?

Enter pizza a diameter, pizza a price, pizza b diameter, pizza b price. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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