Horsepower Calculator
Calculate Horsepower & Kilowatts
How Horsepower is Calculated and Why It Matters
Horsepower is a unit of measurement used to quantify the power output of engines. It reflects the engine's ability to perform work over time, which is crucial for vehicle performance, machinery, and equipment efficiency.
The calculation is based on the relationship between torque and engine speed. Specifically:
- Horsepower (HP) = (Torque × Engine Speed) ÷ 5252, when torque is in lb-ft and speed in RPM.
- If torque is provided in newton-meters (Nm) and speed in radians per second (rad/s), the calculator converts units accordingly before computation.
- To convert horsepower to kilowatts (kW): kW = HP × 0.7457.
- Watts (W) provides a more granular metric, where 1 kW = 1000 W.
Understanding horsepower aids in comparing engine strengths, assessing vehicle acceleration, towing capacities, and overall machine power for industrial uses.