Horsepower ↔ Watts Converter
Compare engines, motors, vehicles, and electrical power.
| Horsepower | Watts |
|---|---|
| 1 | 745.69987 |
| 5 | 3,728.49936 |
| 10 | 7,456.99872 |
| 15 | 11,185.49808 |
| 20 | 14,913.99744 |
Horsepower & Watts 🐎
Horsepower (hp) and watts (W) both measure power — the rate at which energy is produced or consumed.
Horsepower is traditionally used to describe mechanical engine and motor output, while watts are the international scientific and electrical standard for measuring power.
Converting between horsepower and watts helps compare engine performance, electric motor ratings, and mechanical equipment efficiency.
Key Facts
- 1 mechanical horsepower (hp) ≈ 746 watts (W)
- Horsepower originated from comparing steam engines to the work output of horses
- Watts are part of the International System of Units (SI)
- Electric motors and appliances are typically rated in watts or kilowatts
- Vehicle engines, pumps, and industrial machinery commonly use horsepower
Formulas
W = hp × 746- Convert horsepower to wattshp = W ÷ 746- Convert watts to horsepower
Power Conversion Examples
- Car engine: 10 hp → 7,460 W
- Industrial pump: 25 hp → 18,650 W
- Electric motor: 1,500 W → 2.01 hp
- Small lawn mower engine: 5 hp → 3,730 W
Real-World Applications
- Electric vehicle motors are often rated in kilowatts but compared to horsepower for familiarity
- Water pumps and compressors frequently use horsepower ratings
- Workshop tools like air compressors and table saws may list horsepower output
FAQs
Why is horsepower still used today?
Horsepower remains popular because it provides an intuitive way to compare engine and motor performance, especially in automotive and mechanical industries.
Is horsepower an exact unit of measurement?
There are several types of horsepower (mechanical, metric, electrical), but mechanical horsepower (≈746 W) is most commonly used.
How do electric motors compare to combustion engines using horsepower?
Electric motors often deliver power more efficiently and instantly, meaning lower horsepower electric motors can sometimes perform similarly to higher horsepower combustion engines.
Why convert horsepower to watts?
Watts allow direct comparison with electrical systems, energy consumption, and international scientific calculations.
Does higher horsepower always mean better performance?
Not always. Performance also depends on torque, efficiency, gearing, and system design.