Theoretical Air Calculator

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Excess Air Calculator Combustion Air Flow Calculator Actual Air Requirement Calculator Secondary Air Calculator

Scaling a Known Air-Fuel Ratio to Actual Fuel Quantity

Once a fuel's stoichiometric air-fuel ratio is known (from a reference table or the ultimate analysis formula), finding the theoretical air needed for any quantity of that fuel is a straightforward multiplication.

The Formula

Theoretical Air = Fuel Mass × Stoichiometric AFR

Worked Example

Burning 50 kg of a fuel with a stoichiometric AFR of 14.7:1 (typical for gasoline-range fuels):

Theoretical Air = 50 × 14.7 = 735 kg air

How to Use This Calculator

  1. Enter the Fuel Mass to be burned.
  2. Enter the fuel's Stoichiometric Air-Fuel Ratio.
  3. Select Calculate to get total theoretical air.

Related Calculations

Derive AFR from ultimate analysis in the Stoichiometric Air Requirement Calculator, or add excess air margin in the Actual Air Requirement Calculator.