Free · Food planning calculators

Pizza Area and Price Comparison

Compare total circular pizza area and total price for two supplied offers.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. 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

Two 20 cm pizzas have twice the circular area and twice the total price of one identical pizza.

Total area = quantity × pi × diameter² / 4; ratios compare option B with A

Worked example

Enter these known values and leave the other values blank.

Diameter
20 cm
Number of pizzas
1
Price per pizza
10 USD
Diameter
20 cm
Number of pizzas
2
Price
10 USD
Total price
10 USD
Total price
20 USD
Option B total price as % of A
200 %
Area of a small pizza
314.16 cm²
Total area of the small pizzas
314.16 cm²
Area of a large pizza
314.16 cm²
Total area of the large pizzas
628.32 cm²
Option B area as % of A
200 %

Assumptions and limitations

  • Area measures an ideal circular footprint and does not account for crust thickness, topping mass or portion preferences. Ratios compare B with A; 200% means twice A, not a 200% increase. Count whole pizzas and use positive offer-A price.

Common questions

What assumptions affect this result?

Area measures an ideal circular footprint and does not account for crust thickness, topping mass or portion preferences. Ratios compare B with A; 200% means twice A, not a 200% increase. Count whole pizzas and use positive offer-A price.

Can I solve for a missing value?

Clear the missing field and enter compatible known values in the displayed units. Supported inverse branches remain available; rounding and one-way outputs keep their original direction.

References

Use the same arbitrary-precision circle constant for both pizza options; the capture used pi for option A and the truncated 3.14159265 for option B, making equal pizzas appear unequal.

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