Horsepower to Watts Converter
Translate engine or motor ratings from horsepower into watts instantly. Ideal when comparing equipment specifications, sizing electrical circuits, or converting to SI units for technical documentation.
For planning purposes only. Confirm specifications with manufacturer data before purchasing or installing equipment.
Examples
- 1 hp small motor ⇒ 745.7 W output
- 2.5 hp air compressor ⇒ 1,864.3 W of mechanical power
- 0.75 hp sump pump ⇒ 559.3 W draw when running at full capacity
FAQ
Can I convert kilowatts back to horsepower?
Yes. Divide watts by 745.7 to return to mechanical horsepower, or divide kilowatts by 0.7457.
Why are there different horsepower standards?
Industries adopted variations such as mechanical, metric, and electrical horsepower. This calculator uses the mechanical definition common in North America.
Does the result account for efficiency losses?
No. It converts the rated mechanical horsepower only. Real-world output may be lower due to drivetrain or electrical losses.
Additional Information
- Mechanical horsepower equals 550 foot-pounds per second, which translates to exactly 745.7 watts.
- For metric horsepower (often used in Europe), multiply HP by 735.5 instead—slightly lower than mechanical horsepower.
- Watts measure power in the International System of Units and align with electrical calculations such as volts × amps.