Work out pizza size value instantly with clear inputs, formula shown and shareable results.
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.
Area
area = pi x (diameter / 2)^2
Value
cost per 100 cm2 = price / area x 100
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.
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.
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.