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Turbocharger Size Calculator

Use the Turbocharger Size calculator to estimate target compressor flow from target power, airflow per 10 hp. Motorsport Math shows the formula and updates the result instantly.

LIVE CALCULATOR

Turbocharger Size

Target power

Airflow per 10 hp

lb/min

Target compressor flow50 lb/min

FORMULA / Target power × airflow factor ÷ 10

ASSUMPTION A first-pass compressor-map target. Final selection must check pressure ratio, surge margin, efficiency islands and turbine matching.

Ideal theoretical result. Validate against manufacturer data, component limits and your race-series regulations before safety-critical use.

CALCULATION GUIDE

What this calculator is for

The Turbocharger Size Calculator converts target power and airflow per 10 hp into target compressor flow. It is designed for quick motorsport planning when you need the calculation visible, repeatable, and easy to adjust rather than hidden inside a spreadsheet cell. Boost calculations help with turbocharger, supercharger, intercooler, and wastegate planning before a forced-induction setup is committed.

When to use it

Compare how a change in target power affects target compressor flow before committing to parts, setup, or strategy changes.
Check a workshop, dyno, simulator, or trackside spreadsheet result using a transparent formula: Target power × airflow factor ÷ 10.
Use the result to compare possible hardware and operating targets, then validate the setup with compressor maps, charge-temperature data, exhaust backpressure, fuel capacity, knock margin, and dyno testing.

How to use it

Enter target power in hp; the default value shown is 500 hp.
Enter airflow per 10 hp in lb/min; the default value shown is 1 lb/min.

Example calculation

For example, with target power set to 500 hp and airflow per 10 hp set to 1 lb/min, the calculator returns 50 lb/min for target compressor flow. Change one input at a time if you want to understand which value is driving the result.

How to read the result

Target compressor flow is shown in lb/min. Use the number as a calculated reference point, then compare it with measured data from the car, the part supplier, or the race environment. A mathematically clean answer can still be unsuitable if the inputs are estimated, rounded, measured under different conditions, or outside the normal range for the vehicle.

Assumptions and checks

A first-pass compressor-map target. Final selection must check pressure ratio, surge margin, efficiency islands and turbine matching.
Changing target power and airflow per 10 hp together can move the answer in ways that are easy to miss, so make related setup changes deliberately.
Check whether each pressure input is gauge pressure or absolute pressure.
Leave margin for heat, altitude, turbine restriction, pressure drop, and real compressor efficiency.
Do not size boost hardware from a single formula without checking maps and temperature behaviour.

COMMON QUESTIONS

Turbocharger Size FAQ

What is the Turbocharger Size Calculator used for?

It is used to estimate target compressor flow from target power and airflow per 10 hp. The page is most useful when you want a fast result, visible assumptions, and a repeatable way to compare motorsport setup options.

Is the Turbocharger Size result exact?

The arithmetic follows the formula shown on the page, but the practical accuracy depends on the inputs. Measurements, environmental conditions, component tolerances, and race regulations can all affect whether the result is suitable for real use.

Can I use this boost calculation for safety-critical decisions?

Use it as an engineering reference, not as the final authority. Safety-critical decisions should be checked against manufacturer data, professional engineering judgement, inspection, testing, and the rules for the series or event.