Air-Fuel Ratio Calculator
Result
Air-Fuel Ratio Calculator The Air-Fuel Ratio Calculator finds the AFR — the mass of air divided by the mass of fuel in a combustion mixture — plus the equivalence ratio (lambda) relative to the stoichiometric AFR. Lambda below 1 is a rich mixture, above 1 — free online calculator.
Formula
- Air-Fuel Ratio Calculator calculates its result from Mass Of Air, Mass Of Fuel, Stoichiometric Afr. It uses the formula AFR = mass of air / mass of fuel; λ = AFR / stoichiometric AFR. Change any input to recalculate the result instantly.
- The main inputs are Mass Of Air, Mass Of Fuel, Stoichiometric Afr. Enter them in the units and format shown in the calculator.
- Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Air-Fuel Ratio
- Mass Of Air: 14.7
- Mass Of Fuel: 1
- Stoichiometric Afr: 14.7
Using Mass Of Air = 2, Mass Of Fuel = 3, Stoichiometric Afr = 4, the calculated result is 0.1666666667.
Sample result: Calculating…
Frequently asked questions
What does the Air-Fuel Ratio calculate?
Air-Fuel Ratio Calculator The Air-Fuel Ratio Calculator finds the AFR — the mass of air divided by the mass of fuel in a combustion mixture — plus the equivalence ratio (lambda) relative to the stoichiometric AFR. Lambda below 1 is a rich mixture, above 1 — free online calculator.
Which values should I enter?
Enter Mass Of Air, Mass Of Fuel, Stoichiometric Afr using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: AFR = mass of air / mass of fuel; λ = AFR / stoichiometric AFR.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.