Pizza Comparison Calculator
Compare pizza prices by area to find which size is genuinely better value.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Compare price per square inch for the entered diameters. The result ignores crust, toppings, edge area, serving needs and local offers, so it is only one value comparison.
Worked example
calculated with the default values below
Pizza A price 12.99 $ · Pizza A diameter 12 in · Pizza B price 18.99 $ · Pizza B diameter 16 in · People to feed 4 · Slices per person 3 Pizza A area 113.1 sq in · Pizza A price per square inch 0.1149 $ · Pizza B area 201.1 sq in · Pizza B price per square inch 0.0944 $ · Better value Pizza B · Pizza B has this much more area 78 % · Slices needed for your group 12
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
A = π × (d ÷ 2)^2; P_a = P ÷ A; Δ = (A_B ÷ A_A − 1) × 100
- A
- Pizza area (in²)
- d
- Diameter (in)
- P_a
- Price per in²
- Δ
- Size advantage (%)
Lower price per area is better; slices needed = people × slices per person.
Frequently asked questions
Does this calculator compare how many slices each pizza provides?
No. It compares price per square inch and reports total slices needed for the group. It does not estimate slices per pizza or determine which pie feeds the group more cheaply. Slice sizes vary; compare the restaurant’s serving information separately.