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AFR Calculator (Air-Fuel Ratio)
Calculate air-fuel mixture and Lambda ($\lambda$) for engine tuning
Formulas: AFR = Mass of Air / Mass of Fuel.
Lambda ($\lambda$) = Actual AFR / Stoichiometric AFR. Lambda > 1 indicates a lean mixture, < 1 indicates rich.
Lambda ($\lambda$) = Actual AFR / Stoichiometric AFR. Lambda > 1 indicates a lean mixture, < 1 indicates rich.
Mixture Parameters
Calculation Results
⚠️ Running an engine too lean (high AFR) can cause high combustion temperatures leading to pre-ignition, detonation, or engine damage. Running too rich (low AFR) wastes fuel, fouls spark plugs, and increases emissions. For accurate engine tuning, always use a calibrated wideband O2 sensor.