Horsepower is a power unit with the symbol hp. 1 hp = 745.699871582 W It belongs to the power system used across Xunits converter pages.
Quick facts
- Unit name
- Horsepower
- Plural
- horsepower
- Symbol
- hp
- Quantity
- power
- Category
- Power
- Base relationship
- 1 hp = 745.699871582 W
- Base unit
- Watt (W)
- Converter hub
- Power converter
Scale comparison
This chart places hp beside neighboring power units by their relationship to W.
Definition and symbol
The horsepower is written with the symbol hp. In professional writing, keep the number and symbol together, preserve capitalization, and avoid replacing the symbol with a similar-looking informal abbreviation unless the source uses it.
Scale and relationships
Horsepower is best understood relative to nearby power units. Power measures the rate at which energy is transferred or work is done. The SI unit is the watt, equal to one joule per second. The table below shows the exact Xunits relationship used by converter pages.
| Unit | Symbol | Relationship |
|---|---|---|
| Watt | W | 1 W is the base reference for this Xunits power category. |
| Kilowatt | kW | 1 kW = 1,000 W |
| Megawatt | MW | 1 MW = 1,000,000 W |
| Horsepower | hp | 1 hp = 745.699871582 W |
| BTU per Hour | BTU/h | 1 BTU/h = 0.293071070172 W |
Where horsepower is used
Power units appear in motors, engines, pumps, compressors, generators, appliances, HVAC equipment, electrical systems, and energy analysis. Horsepower is especially useful when the source instrument, document, product listing, or regional convention uses hp as its native unit.
Common mistakes
- Do not confuse power with energy. Kilowatt is power; kilowatt-hour is energy accumulated over time.
- Do not compare hp values with another unit until both values are converted to the same basis.
- Do not round too early when the value is used for sizing, limits, billing, reporting, or technical documentation.
Converters and formulas
Open a converter page when you need a direct calculation involving horsepower.
Related unit guides
Compare hp with neighboring units in the same category.
FAQ
What is a horsepower?
Horsepower is a power unit represented by hp. 1 hp = 745.699871582 W
How do I convert horsepower to another unit?
Use a matching Xunits converter page, or convert through the base relationship shown above. For most professional work, keep the original value visible and round only the final answer.
What is the most common mistake with hp?
The most common mistake is treating the numeric value as self-explanatory. Always keep the unit symbol and context with the number.