Horsepower to Watt Converter
Convert Horsepower to Watt — free, instant, accurate. Part of Power converters.
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Horsepower to Watt: values and formula
1 Horsepower = 745.7 Watt, and 1 Watt = 0.0013410219 Horsepower. To convert a power value from Horsepower to Watt, multiply it by 745.7. For example, 10 Horsepower equals 7457 Watt, and 250 Horsepower equals 186425 Watt.
| Horsepower | Watt |
|---|---|
| 1 Horsepower | 745.7 Watt |
| 2 Horsepower | 1491.4 Watt |
| 5 Horsepower | 3728.5 Watt |
| 10 Horsepower | 7457 Watt |
| 25 Horsepower | 18642.5 Watt |
| 50 Horsepower | 37285 Watt |
| 100 Horsepower | 74570 Watt |
| 500 Horsepower | 372850 Watt |
| 1000 Horsepower | 745700 Watt |
When to use the Horsepower to Watt converter
- Car specifications — comparing horsepower (US/UK) and PS or kW (Europe).
- Electrical appliances — reading wattage to estimate energy consumption.
- Audio equipment — speaker and amplifier ratings.
- Industrial machinery — sizing motors and pumps.
A short history of power units
James Watt defined "horsepower" in 1782 to market his steam engines against draft horses. The SI unit of power, the watt, is named in his honour. One mechanical horsepower is exactly 745.7 W; one metric horsepower (PS, used in European car specs) is 735.5 W — close but not identical.
Common mistakes when converting power
Mechanical vs metric horsepower
A 100 hp engine (mechanical) is 101.4 PS (metric). Always check which standard a quote uses.
Confusing power and energy
A 1500 W kettle uses 1.5 kWh of energy if it runs for an hour, not 1500 kWh.
BTU/h vs BTU
Air conditioner ratings in "BTU" are actually BTU per hour — the rate, not the total energy.
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