Power converter
Watts, kilowatts, metric horsepower and imperial horsepower, two “horsepowers” differing by 1.4 %.
Result
Converted value
0.735 499 kW
- Formula
- 1 ch = 0.735 498 75 kW
Calculation, assumptions and sources
OverviewA power converted between microwatts, milliwatts, watts, kilowatts, megawatts, gigawatts, metric horsepower, mechanical horsepower and BTU per hour.
A power converted between microwatts, milliwatts, watts, kilowatts, megawatts, gigawatts, metric horsepower, mechanical horsepower and BTU per hour. Metric and imperial horsepower, often rendered by the same word, are two distinct units.
Method & formulasP = E / t
P = E / t1 ch = 735.49875 W (exactly)1 hp = 745.69987 W (exactly)
Power is energy per unit time. Metric horsepower is exactly 75 kgf·m/s, imperial horsepower 550 ft·lbf/s.
- µW
- Microwatt (µW)
- mW
- Milliwatt (mW)
- W
- Watt (W)
- kW
- Kilowatt (kW)
- MW
- Megawatt (MW)
- GW
- Gigawatt (GW)
- ch
- Metric horsepower (ch)
- hp
- Mechanical horsepower (hp)
- BTU/h
- BTU per hour (BTU/h)
- ch
- Metric horsepower: 75 kgf·m/s = 735.49875 W. The imperial horsepower (hp) is 745.7 W, about 1.4% higher. Both are commonly called “horsepower”.
- hp
- Imperial mechanical horsepower: 550 ft·lbf/s = 745.69987 W. Not to be confused with metric horsepower (735.5 W).
- BTU/h
- Derived from the international-table BTU, see the BTU note in the Energy dimension.
Validity domainA power quoted as 100 hp is 73.5 kW under the metric convention and 74.6 kW under the imperial one, a 1.4 % gap.
A power quoted as 100 hp is 73.5 kW under the metric convention and 74.6 kW under the imperial one, a 1.4 % gap. European documentation generally uses metric horsepower, North American documentation the imperial one. When the source does not name the unit, no conversion can resolve the ambiguity.