Power Converter
Convert between watts, kilowatts, horsepower, BTU per hour and other power units.
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Power units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the watt (W).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Milliwatt | mW | SI | = 0.001 W |
| Watt | W | SI | Base unit |
| Kilowatt | kW | SI | = 1000 W |
| Megawatt | MW | SI | = 1000000 W |
| Gigawatt | GW | SI | = 1000000000 W |
| Horsepower (mechanical) | hp | US customary | = 745.69987158227022 W |
| Horsepower (metric) | PS | metric | = 735.49875 W |
| BTU (IT) per hour | BTU/h | US customary | ≈ 0.2930710702 W |
| Foot-pound-force per second | ft·lbf/s | US customary | = 1.3558179483314004 W |
Watt quick reference
| Watt | Kilowatt | Horsepower (mechanical) | Horsepower (metric) |
|---|---|---|---|
| 1 W | = 0.001 kW | ≈ 0.00134102209 hp | ≈ 0.001359621617 PS |
| 10 W | = 0.01 kW | ≈ 0.0134102209 hp | ≈ 0.01359621617 PS |
| 100 W | = 0.1 kW | ≈ 0.134102209 hp | ≈ 0.1359621617 PS |
| 1000 W | = 1 kW | ≈ 1.34102209 hp | ≈ 1.359621617 PS |
Among the 9 power units on this page, the smallest is the milliwatt (mW) and the largest is the gigawatt (GW).
More power conversions
- Watt to Horsepower (mechanical)W → hp
- Horsepower (mechanical) to Watthp → W
- BTU (IT) per hour to WattBTU/h → W
- Horsepower (mechanical) to Horsepower (metric)hp → PS
- Kilowatt to BTU (IT) per hourkW → BTU/h
- Kilowatt to Horsepower (metric)kW → PS
- Watt to BTU (IT) per hourW → BTU/h
- BTU (IT) per hour to KilowattBTU/h → kW
- Horsepower (metric) to Horsepower (mechanical)PS → hp
- Horsepower (metric) to KilowattPS → kW
About power units
Power is the rate of transferring energy. The SI unit is the watt, one joule per second.
There are two common horsepowers. Mechanical horsepower (hp) is 550 foot-pounds-force per second, about 745.7 W. Metric horsepower (PS) is exactly 735.49875 W. Car specifications in Europe usually use PS.
Frequently asked questions
- How many watts are in one horsepower?
- About 745.7 W for mechanical horsepower, and exactly 735.49875 W for metric horsepower.
- What does BTU/h mean on an air conditioner?
- It is the cooling power: British thermal units of heat removed per hour. 12,000 BTU/h, often called one "ton" of cooling, is about 3.5 kW.
- How many kilowatts are in one watt?
- One watt = 0.001 kW (kilowatts).
- How many horsepower are in one watt?
- One watt ≈ 0.00134102209 hp (horsepower).
- How many metric horsepower are in one watt?
- One watt ≈ 0.001359621617 PS (metric horsepower).