Horsepower to Kilowatts Converter
1 hp (mechanical) = 0.745700 kW. A 300 hp sports car engine = 223.7 kW. Electric motors use kW ratings.
Inverse conversion
1 kW = 1.34102 hp (mechanical). A 100 kW car engine produces about 134 hp. Electric motors are rated in kW.
Formula
Formula
kW = hp × 0.745700
Worked example
A 300 hp engine: 300 × 0.745700 = 223.71 kW.
Quick reference table
| hp | kW |
|---|---|
| 1 | 0.7457 |
| 5 | 3.728499 |
| 10 | 7.456999 |
| 50 | 37.284994 |
| 100 | 74.569987 |
| 200 | 149.139974 |
| 300 | 223.709961 |
| 500 | 372.849936 |
Unit definitions
Horsepower (hp)
Mechanical horsepower (hp) = 550 ft·lbf/s = 745.69987 W. The standard US power unit for engines and motors.
Kilowatt (kW)
The kilowatt (kW) = 1,000 W. The SI unit for power, used in electric motors, appliances, and international engineering.
Common use cases
- Converting US engine specs to metric kW for international use
- Electric motor equivalency: diesel engine hp vs electric kW
- Pump and compressor specifications
- Solar panel and grid power ratings