Turbocharger Size Calculator

Calculate turbocharger size for engine performance goals.

Power Goals

Hp Label

Crankshaft horsepower target

Boost Label

Planned manifold pressure

Results Title

Airflow30.0 lb/minRequired compressor capacity

Pressure Ratio2.02Y-axis on map

In CFM434

Ensure your engine's displacement can flow this much air at the given pressure ratio without surging or hitting the choke line.

Overview

Turbo size calculation matches turbo to engine for target power. Based on airflow, pressure ratio, and efficiency. Essential for performance builds.

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Pro Tips

Bigger is not always better. A turbo that's too large will be laggy and unresponsive.
Look for a compressor map where your target point (lb/min and PR) sits in the 70% efficiency island or better.
Fun Fact
Did you know? Modern ball-bearing turbos can spin at over 150,000 RPM!

Fun Facts

Formula: Airflow (lb/min) = HP × BSFC / 60; Pressure Ratio = Boost / 14.7 + 1

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