Turbocharger Airflow (CFM), Boost Pressure Ratio & Mass Flow Calculator
Calculate required turbocharger volumetric airflow (CFM), mass airflow (lb/min), and Pressure Ratio (PR) to accurately read compressor maps and size the right turbo for your engine build.
Required Turbocharger Airflow (CFM)
Calculator Inputs
Required Turbocharger Airflow (CFM)
Air Mass Flow Rate (lb/min)
Compressor Pressure Ratio (PR)
Estimated Potential Engine Power (HP)
Boost Bar
Air Mass Flow (lb/min) vs Estimated Power Potential (HP)
Automotive performance engineering tool compatible with Garrett, BorgWarner, and Precision Turbo compressor flow maps.
This calculator is designed for educational and informational purposes based on publicly declared statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimates. Always verify with the relevant official authorities or a certified professional advisor.
Calculation Methodology
Pressure Ratio (PR) = (14.7 + Boost PSI) / 14.7. Naturally Aspirated CFM = (Displacement in³ * RPM * VE%) / 3456. Turbocharged CFM = NA CFM * PR. Mass Flow (lb/min) = CFM * 0.069.
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