Conversion tool
Convert horsepower to kilowatts instantly
Enter a value, see the result, copy it, and save a PDF snapshot.
Convert
Results update automatically. Use the controls beside the result to change the number of decimal places.
Skip Ctrl+C and Ctrl+V. Copy or paste the complete displayed value without selecting text or leaving behind a decimal place.
Recent power conversions
Keep your calculation process moving. Your last 10 conversions stay here, ready to copy or save as a favorite.
Favorite power conversions
Save the values you reuse throughout a project. Copy them again without retyping or recalculating.
Notes
Use this space for project notes before saving as PDF.
Disclaimer: Use calculations at your own risk. For critical applications, verify results against your governing standards/specifications.
How it works
We use kW = hp x 0.745699871582.
Exact relationship: 1 hp = 0.745699871582 kW.
Example: 1 hp = 0.746 kW.
Notes: Results are rounded in the default view.
Examples
- 1 hp = 0.746 kW
- 10 hp = 7.457 kW
- 50 hp = 37.285 kW
FAQ
What physical quantity do horsepower and kilowatts express?
Horsepower expresses power at a scale familiar in engines, motors, and machinery, especially in U.S.-oriented and legacy industrial contexts. Kilowatts express larger power values using metric scaling and are common where watts would be too small for convenient reporting.
What is the difference between horsepower and kilowatts?
Horsepower and kilowatts both express power, but they are favored in different industries, equipment catalogs, and regional technical conventions.
What is the history of the horsepower?
Horsepower was popularized to compare engine output with familiar draft-animal work and remains common in transportation and machinery markets.
What is the history of the kilowatt?
The kilowatt follows directly from SI scaling and became standard in electrical systems, utilities, industrial drives, and equipment ratings.
Were the horsepower and kilowatt discovered by a specific person?
Horsepower was developed as a practical comparative unit, not discovered by one person as a natural quantity. The kilowatt is an SI-derived scaled unit established through standardization, not discovered by one person.
Where are horsepower and kilowatts used in science and engineering?
Horsepower is common in automotive, industrial motors, pumps, compressors, and machinery sales documentation. Kilowatts are used in motors, generators, industrial equipment, EV charging, utilities, and international machine specifications.
Why do power units matter in calculations?
Power units affect equipment sizing, thermal capacity, drive selection, energy-rate interpretation, and machine capability comparisons. Keeping the unit visible helps prevent mismatches across specs and purchasing documents.
Can I trust this for critical calculations?
Use this for convenience and verify against your governing standard, equipment manual, or controlled engineering source for critical work. Real equipment performance still depends on duty cycle, efficiency, and operating conditions.
References
- Exact constant used: 1 hp = 0.745699871582 kW.
- Power conversions are derived from consistent relationships anchored to the watt.