Horsepower Calculator
Calculate and convert horsepower (HP) to kilowatts (kW) and metric horsepower (PS). Use our free calculator to determine engine power from torque, RPM, force, velocity, work, and engine displacement with instant results and detailed formulas.
Horsepower Calculator
Calculate horsepower from various parameters including torque, RPM, force, and engine displacement.
Input Parameters
Calculate horsepower from engine torque and rotational speed
Formula
Engine torque in Newton-meters
Engine revolutions per minute
No results to display. Please enter values and calculate.
About Horsepower Calculator
What is Horsepower?
Horsepower (HP) is a unit of measurement for power, representing the rate at which work is done. Originally defined by James Watt in the 18th century, one horsepower was equivalent to the power of a horse lifting 550 pounds one foot in one second. Today, horsepower is commonly used to measure engine power in vehicles, machinery, and equipment. Understanding horsepower helps in comparing engine performance, fuel efficiency, and determining the right power output for specific applications.
Key Components of Horsepower
- Mechanical Horsepower (HP): Standard unit equal to 745.7 watts
- Metric Horsepower (PS): European standard equal to 735.5 watts
- Brake Horsepower (BHP): Power measured at the engine's crankshaft
- Wheel Horsepower (WHP): Power delivered to the wheels after drivetrain losses
- Indicated Horsepower (IHP): Theoretical power calculated from cylinder pressure
Why Horsepower Matters
Horsepower is crucial for determining vehicle performance, acceleration capabilities, towing capacity, and fuel efficiency. It helps consumers make informed decisions when purchasing vehicles or equipment, ensures proper matching of engines to applications, and provides a standardized way to compare power outputs across different manufacturers and engine types.