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Convert power units instantly between Horsepower (hp) and Kilowatts (kW), Watts, and BTU/hr. Free electrical and automotive engine power calculator.
Energy and power comparison
| Horsepower (Mechanical/Imperial) (hp) | Kilowatt (kW) | Kilowatt (Reverse) | Horsepower (Mechanical/Imperial) Equivalent | Action |
|---|---|---|---|---|
| 0.1 hp | 0.07457 kW | 0.1 kW | 0.13410 hp | |
| 0.5 hp | 0.37285 kW | 0.5 kW | 0.67051 hp | |
| 1 hp | 0.74570 kW | 1 kW | 1.34102 hp | |
| 2 hp | 1.49140 kW | 2 kW | 2.68204 hp | |
| 5 hp | 3.72850 kW | 5 kW | 6.70511 hp | |
| 10 hp | 7.45700 kW | 10 kW | 13.41022 hp | |
| 20 hp | 14.91400 kW | 20 kW | 26.82044 hp | |
| 50 hp | 37.28499 kW | 50 kW | 67.05110 hp | |
| 100 hp | 74.56999 kW | 100 kW | 134.10221 hp | |
| 500 hp | 372.84994 kW | 500 kW | 670.51104 hp | |
| 1000 hp | 745.69987 kW | 1000 kW | 1,341.02209 hp |
Symbol: W. Commonly used in: si.
Symbol: kW. Commonly used in: metric.
Symbol: MW. Commonly used in: metric.
Symbol: hp. Commonly used in: imperial.
Symbol: PS. Commonly used in: metric.
Every conversion starts with the standard baseline rate between these two units:
Multiply your entered number by the conversion rate to calculate the exact target value:
The result is neatly rounded to your preferred decimal setting so it is clear and ready to use:
| Unit Name | Symbol | System | Conversion Rate | Common Uses |
|---|---|---|---|---|
| Watt | W | si | 1 W = 1.000000 W | Everyday, home, and school measurements in Power. |
| Kilowatt | kW | metric | 1 kW = 1,000.000000 W | Everyday, home, and school measurements in Power. |
| Megawatt | MW | metric | 1 MW = 1,000,000.000000 W | Everyday, home, and school measurements in Power. |
| Horsepower (Mechanical/Imperial) | hp | imperial | 1 hp = 745.699872 W | Everyday, home, and school measurements in Power. |
| Metric Horsepower (Pferdestärke) | PS | metric | 1 PS = 735.498750 W | Everyday, home, and school measurements in Power. |
| BTU per hour | BTU/h | imperial | 1 BTU/h = 0.293071 W | Everyday, home, and school measurements in Power. |
| Foot-pound per second | ft·lbf/s | imperial | 1 ft·lbf/s = 1.355818 W | Everyday, home, and school measurements in Power. |
James Watt invented the term horsepower to compare steam engine performance against working draft pit horses (defined as lifting 33,000 ft-lb per minute).
Mechanical/Imperial HP (745.7 W) is slightly higher than Metric HP (PS/CV = 735.5 W).
Multiply horsepower by 0.7457 (or divide by 1.341). For example, a 200 hp engine produces 149.14 kW.
Mechanical HP is based on imperial units (550 ft-lb/s = 745.6999 W). Metric HP (PS) is 75 kgf-m/s = 735.4988 W. 100 PS = 98.63 HP.
Every calculation uses trusted, standard definitions so your results are 100% accurate for school, home, work, and recipes.
