Boost Pressure and Volumetric Efficiency Calculator

A free turbo-matching calculator built by ProjectCarTV. Enter your engine specs — cylinders, bore, stroke, altitude, intake temp — and it works out the airflow you need, checks it against 38 real turbos (T3, T4, GT-series, Holset, K03/K04, and more), and plots your setup on a compressor map so you can see where you land relative to surge and choke.

No install, no account. Opens right in your browser on your phone or computer and works offline once downloaded. Comes from the same research behind Forced Induction and Turbochargers and Boost Fundamentals.