Free · Pizza calculators 🍕
Pizza Crust-Aware Area and Price Comparison
Compare two pizza prices per circular area, optionally excluding the crust from the area you plan to eat.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
Loading calculator…
How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
For 30 cm and 40 cm pizzas priced at $10 and $15 with crust included, the larger pizza costs 15.625% less per circular area. Both retain a modeled 2 cm topping-free rim.
Area counted = π × (diameter/2 − excluded crust width)²; price density = price / counted area
Worked example
Enter these known values and leave the other values blank.
- Diameter
- 30 cm
- Price
- 10 USD
- Diameter
- 40 cm
- Price
- 15 USD
- Crust size
- 2 cm
- True cost
- 141.47 USD / m²
- Toppings cover...
- 75.1 % of pizza
- Edible area
- 707 cm²
- Crust
- 176 cm²
- Toppings
- 531 cm²
- True cost
- 119.37 USD / m²
- Toppings cover...
- 81 % of pizza
- Edible area
- 1257 cm²
- Crust
- 238.8 cm²
- Toppings
- 1018 cm²
Assumptions and limitations
- Both pizzas use the same uniform crust width. This compares area and price, not topping mass, calories or flavor. The crust width must be nonnegative and smaller than both radii. The eat-crust choice controls price area; topping fractions still exclude the modeled rim. Use one currency.
Common questions
What limits this estimate?
Both pizzas use the same uniform crust width. This compares area and price, not topping mass, calories or flavor. The crust width must be nonnegative and smaller than both radii. The eat-crust choice controls price area; topping fractions still exclude the modeled rim. Use one currency.
How should I enter a different quantity?
Choose the displayed measurement units before entering a value. Clear the unknown field, enter compatible known values, and use the preserved inverse branches where available. One-way estimates and rounded package outputs keep their original direction.
References
Bookify requires each pizza radius to exceed the crust width so counted and topping areas remain positive.