CHEMISTRY CALCULATORS
Air-Fuel Ratio (AFR) Calculator
Determine your engine’s air-to-fuel ratio for optimal performance.
What is the Air-Fuel Ratio (AFR) Calculator & How does it work?
The Air-Fuel Ratio (AFR) is a crucial metric in internal combustion engines, indicating the proportion of air to fuel mixed during combustion. An ideal AFR ensures efficient combustion and maximum power output. The formula to calculate AFR is:The constant 14.7 is used because at standard atmospheric pressure and temperature, one mole of air weighs approximately 28.96 grams, and the stoichiometric AFR for gasoline engines is around 14.7:1.
\text{AFR} = \frac{\text{Volume of Air}}{\text{Mass of Fuel}} \times 14.7
AFR = Air-Fuel Ratio, Volume of Air in liters, Mass of Fuel in grams
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Results are for informational purposes only and do not constitute professional advice.