Power converter
Unit conversionHow much is that power in other units?
Convert between watts, kilowatts, megawatts, horsepower, metric horsepower and BTU per hour, exactly.
What you enter stays on your device while you use this tool. Opening a shared link sends the settings in its address to HowToolbox to prepare the page.
Result
1.341 hp
1 kilowatt is about 1.341 horsepower
- The other way round: 1 hp ≈ 0.7457 kW.
- Exact by definition: 1 kW = 1,000 W.
In all units
- Milliwatts
- 1,000,000 mW
- Watts
- 1,000 W
- Kilowatts
- 1 kW
- Megawatts
- 0.001 MW
- Horsepower
- 1.341 hp
- Metric horsepower
- 1.36 PS
- BTU per hour
- 3,412 BTU/h
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Convert between watts, kilowatts, megawatts, horsepower, metric horsepower and BTU per hour, exactly.
How to use
- Type the power you want to convert.
- Choose the units to convert from and to. Use the swap button to flip them.
How it works
Every unit is converted through watts using exact definitions: a kilowatt is 1,000 W, a megawatt is a million W, mechanical horsepower is 550 foot-pounds of force per second (about 745.7 W), metric horsepower (PS) is 75 kilogram-force metres per second (735.49875 W), and a BTU per hour is a British thermal unit spread over an hour (about 0.293 W). So 100 kW is about 134.1 hp.
The watt comes from the BIPM SI Brochure; the horsepower and BTU definitions from NIST Special Publication 811.
Horsepower comes in several versions. This converter has the mechanical (imperial) horsepower and the metric one, which differ by about 1.4 %. Car makers outside the US usually quote metric.
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Frequently asked questions
How many watts are in a horsepower?
About 745.7 W for mechanical horsepower and exactly 735.49875 W for metric horsepower (PS).
How many kilowatts is 100 hp?
About 74.57 kW with mechanical horsepower, or 73.55 kW with metric horsepower.
How many BTU/h is a kilowatt?
About 3,412 BTU/h. Air conditioners and heaters are often rated in BTU/h.
Is power the same as energy?
No. Power is how fast energy is used (W, kW, hp). Energy is the total (J, kWh). A 1 kW heater running for one hour uses 1 kWh.
Can I convert watts to amps without a voltage?
No. For direct current, current = power ÷ voltage. AC calculations can also need the power factor; this tool only converts power units.
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