Pizza Value Calculator
Which pizza gives more area for the money, and by how much.
Results
Area per unit of money
59.40
cm²
Area per unit of money
74.36
cm²
Area
706.9
cm²
Area
1256.6
cm²
Percentage change
25.2
%
What this tool does
Pizzas are priced by diameter but eaten by area, and area grows with the square of the diameter. This compares two sizes on square centimetres per unit of currency, which is the only fair way to decide.
Formula
area = π × (d ÷ 2)² · value = area ÷ price
Variables
| Symbol | Meaning | Unit |
|---|---|---|
d1 | Diameter | cm |
p1 | Price | — |
d2 | Diameter | cm |
p2 | Price | — |
V1 | Area per unit of money | cm² |
V2 | Area per unit of money | cm² |
A1 | Area | cm² |
A2 | Area | cm² |
W | Percentage change | % |
Worked example
- Diameter30 cm
- Price11.9
- Diameter40 cm
- Price16.9
- Area per unit of money59.40 cm²
- Area per unit of money74.36 cm²
- Area706.9 cm²
- Area1256.6 cm²
- Percentage change25.2 %
Limitations
- The tool works with whatever currency you use for the inputs; it does not convert between currencies.
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.
Frequently asked questions
Is a large pizza really better value?
Usually, and by more than people expect, because area grows with the square of the diameter. A 40 cm pizza is not a third bigger than a 30 cm one — it has almost twice the area. Two small pizzas rarely beat one large one, even when the prices look similar.