AFR (Air-Fuel Ratio) Calculator
Analysis
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How It Works
The Air-Fuel Ratio (AFR) is the mass ratio of air to fuel present in a combustion process. The stoichiometric AFR is the ideal ratio where all fuel is burned with all available oxygen.
Formula: AFR = Mass of Air / Mass of Fuel
For gasoline, the stoichiometric ratio is approximately 14.7:1, meaning 14.7 parts air to 1 part fuel by mass.
When AFR is higher than stoichiometric, the mixture is “lean” (excess air). When lower, it’s “rich” (excess fuel).
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