๐ Automotive
Engine Horsepower Calculator
A naturally aspirated engine makes roughly 1.5 to 2 horsepower per cubic foot per minute of airflow, since horsepower depends on how much air the engine can move. This calculator estimates power from displacement, rpm and volumetric efficiency.
How it works
Engine displacement
Engine speed at peak power
Volumetric efficiency
Boost pressure
Drivetrain loss
Estimated crank horsepower
Estimated wheel horsepower
Estimated torque at that rpm
Engine size
Specific output
Frequently asked questions
How do I use the Engine Horsepower Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.