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Whiz Tools

Air-Fuel Ratio Calculator - Optimize Engine Performance & Tuning

Calculate air-fuel ratio (AFR) instantly for engine tuning and diagnostics. Free tool helps optimize power output, fuel economy, and emissions. Perfect for mechanics and enthusiasts.

Air-Fuel Ratio (AFR) Calculator

Input Values

Results

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14.70
Lean-Ideal Mixture: 14.5-15:1 - Good for fuel economy

Calculation Formula

AFR = Air Mass Ă· Fuel Mass

AFR = 14.70 Ă· 1.00 = 14.70

AFR Visualization

Information

The Air-Fuel Ratio (AFR) is a critical parameter in combustion engines that represents the ratio of air mass to fuel mass in the combustion chamber. The ideal AFR varies depending on the fuel type and engine operating conditions.

Ideal AFR Values

  • Gasoline: 14.7:1 (stoichiometric), 12-13:1 (power), 15-17:1 (economy)
  • Diesel: 14.5:1 to 15.5:1
  • E85 (Ethanol): 9.8:1
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Documentation

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