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Sources and Accuracy
Power conversions use watt as the reference unit and include mechanical horsepower, electrical power, and heat-rate units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
horsepower (mechanical) [hp]
Definition
Mechanical horsepower is a power unit equal to about 745.7 watts.
History
Horsepower was popularized to compare machine output with work previously done by draft animals.
Current use
Horsepower is used for engines, motors, vehicles, pumps, and equipment output ratings.
kilowatt [kW]
Definition
The kilowatt is a power unit equal to 1000 watts.
History
Kilowatts became common as electrical and mechanical systems needed larger power ratings.
Current use
Kilowatts are used for generators, electric vehicles, HVAC, solar systems, appliances, and energy planning.
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How to Convert
Enter the value in the “From value” field.
Confirm the source unit is horsepower (mechanical) [hp].