How to convert horsepower to kilowatts
Apply the documented horsepower-to-kilowatts relationship below, keeping the full stored constant until the displayed result is rounded.
Horsepower × 0.745699872 = Kilowatts
For example, 10 hp equals 7.45699872 kW.
Horsepower to Kilowatts reference table
| Horsepower | Kilowatts |
|---|---|
| 1 hp | 0.74569987 kW |
| 5 hp | 3.72849936 kW |
| 10 hp | 7.45699872 kW |
| 25 hp | 18.6424968 kW |
| 50 hp | 37.2849936 kW |
| 100 hp | 74.5699872 kW |
Method and quality checks
- Calculation
- Horsepower × 0.745699872 = Kilowatts. The calculator keeps the stored factor through the operation and rounds only the displayed result to the selected or page-supported precision.
- Unit convention
- Power is a rate of energy transfer. A power value cannot be compared directly with an energy total such as kWh.
- Input validation
- Finite numeric inputs are accepted. Results outside the supported numeric range are rejected instead of being displayed as valid measurements.
- Reasonableness check
- 10 hp produces 7.45699872 kW. Check the direction and approximate scale before relying on a more precise displayed value.
Deeper method: How significant figures work.
Mechanical horsepower expressed in kilowatts
This converter uses mechanical horsepower, not metric horsepower. One mechanical horsepower is approximately 0.745699872 kilowatt, based on the standard relationship between horsepower and watts.
- Look for hp, PS, CV, or a stated standard before comparing international specifications.
- Preserve whether the rating describes shaft output, electrical input, or another test condition.
- Use the unrounded value before combining several motors or loads.
Reference: NIST power conversion factors.