HP to Watts
Select your horsepower type, adjust the slider or type in the value, and get instant results.
Interactive Electricity Flow Simulator
Watch the flow of electricity (electrons) change speed in real-time based on calculated wattage!
Visual scale relative to appliances
Thermodynamic Work conversion
Horsepower represents mechanical power (torque times angular velocity). 1 mechanical HP is the power required to lift 550 pounds by 1 foot in 1 second.
Horsepower in Mechanical and Electrical Markets
The term horsepower (HP) was originally adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. Today, horsepower remains a dominant unit of power measurement for industrial engines, electric motors, and vehicle machinery, while the **Watt (W)** is the standardized SI unit.
Whether you are sizing a submersible water pump, inspecting a lawn mower engine, or configuring an industrial conveyor motor, understanding the conversion between mechanical horsepower and electrical watts is essential to prevent electrical circuit overloads.
Make sure you check which standard your equipment uses: mechanical HP (746W) for pumps, metric HP (735.5W) for European cars, or boiler HP (9,812.5W) for steam generators.
How to Convert Horsepower to Watts
Follow these simple steps to perform the mechanical-to-electrical power calculation:
- Identify the horsepower rating on the equipment's nameplate.
- Select the calculation standard (Mechanical, Electrical, or Metric).
- Multiply the horsepower value by the conversion factor (e.g. 745.7 for mechanical).
- The output is the continuous load requirement in Watts (W).
Common Horsepower to Watts Benchmarks
| Equipment Type | Typical HP | Watts Equivalent |
|---|---|---|
| Standard Garbage Disposal | 0.5 HP | ~373 W |
| Submersible Well Pump | 1.5 HP | ~1,119 W |
| Home Shop Air Compressor | 5 HP | ~3,728 W |
| Tesla Model 3 Rear Motor | 283 HP | ~211,000 W (211 kW) |