Power converter
Mechanical horsepower (hp, 745.7 W) and metric horsepower (PS, 735.5 W) differ by about 1.4%.
1 horsepower (mechanical) = 0.7457 kilowatts
How it’s calculated
kW = hp × 0.7456998716
- Multiply the value in horsepower by 0.7456998716.
- To go back, divide by 0.7456998716 (or multiply by 1.34102209).
- 1 hp = 0.7456998716 kW · 1 kW = 1.34102209 hp
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 hp = 745.69987158227 W and 1 kW = 1000 W, so 1 hp = 0.74569987158227 kW. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.) (SI prefixes and accepted units).
Multiply by the factor written as a fraction
Put hp in the denominator so it cancels, leaving kW.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.7457 kW
1 hp in other units
Batch convert hp → kW
- 1 hp = 0.7457 kW
- 5 hp = 3.7285 kW
- 10 hp = 7.457 kW
- 25 hp = 18.642 kW
Common power conversions
Power units and exact definitions
| Unit | System | Definition |
|---|---|---|
| Watt (W) | SI (metric) | Base unit |
| Kilowatt (kW) | SI (metric) | 1 kW = 1000 W |
| Megawatt (MW) | SI (metric) | 1 MW = 1000000 W |
| Horsepower (mechanical) (hp) | US & imperial (identical) | 1 hp = 745.6998716 W |
| Metric horsepower (PS) (PS) | metric (non-SI) | 1 PS = 735.49875 W |
| BTU per hour (BTU/h) | US & imperial (identical) | 1 BTU/h = 0.2930710702 W |
| Ton of refrigeration (TR) | US customary | 1 TR = 3516.852842 W |
| Kilocalorie per hour (kcal/h) | other | 1 kcal/h = 1.162222222 W |
Horsepower to kilowatts conversion table
| Horsepower (hp) | Kilowatts (kW) |
|---|---|
| 0.1 hp | 0.07457 kW |
| 0.5 hp | 0.37285 kW |
| 1 hp | 0.7457 kW |
| 2 hp | 1.4914 kW |
| 3 hp | 2.2371 kW |
| 4 hp | 2.9828 kW |
| 5 hp | 3.7285 kW |
| 6 hp | 4.4742 kW |
| 7 hp | 5.2199 kW |
| 8 hp | 5.9656 kW |
| 9 hp | 6.7113 kW |
| 10 hp | 7.457 kW |
| 15 hp | 11.185 kW |
| 20 hp | 14.914 kW |
| 25 hp | 18.642 kW |
| 30 hp | 22.371 kW |
| 40 hp | 29.828 kW |
| 50 hp | 37.285 kW |
| 75 hp | 55.927 kW |
| 100 hp | 74.57 kW |
| 250 hp | 186.42 kW |
| 500 hp | 372.85 kW |
| 1,000 hp | 745.7 kW |
Frequently asked questions
Which power units can I convert?
watts (W), kilowatts (kW), megawatts (MW), horsepower (hp), metric horsepower (PS), BTU per hour (BTU/h), tons of refrigeration (TR), kilocalories per hour (kcal/h).
How accurate are the results?
Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.