Horsepower to kilowatts
Multiply horsepower by 0.7457 to get kilowatts.
200 hp = 149.14 kW
How to convert horsepower to kilowatts
The kilowatt is one thousand watts — the metric unit for engine and appliance power. The horsepower is mechanical (imperial) horsepower, about 745.70 watts.
Worked example — 200 hp: 200 × 0.7457 = 149.14 kW.
Horsepower to kilowatts table
| Horsepower | Kilowatts |
|---|---|
| 1 hp | 0.7457 kW |
| 50 hp | 37.285 kW |
| 100 hp | 74.57 kW |
| 150 hp | 111.855 kW |
| 200 hp | 149.14 kW |
| 250 hp | 186.425 kW |
| 300 hp | 223.71 kW |
| 400 hp | 298.2799 kW |
| 500 hp | 372.8499 kW |
Reverse and related
About horsepower and kilowatts
Horsepower (hp)
1 hp = 0.7457 kWDefinition. Mechanical (imperial) horsepower, about 745.70 watts
History and origin
Horsepower was coined by James Watt in the 1780s to compare his steam engines to the draught horses they replaced, based on the work a horse could do. Mechanical horsepower is about 745.7 watts.
Current use
Horsepower rates car and engine power in the United States and United Kingdom.
Source: NIST SP 811, App. B (power). Mechanical hp = 550 ft·lbf/s ≈ 745.70 W; metric hp (PS) = 75 kgf·m/s = 735.49875 W
Kilowatt (kW)
1 kW = 1.341 hpDefinition. One thousand watts — the metric unit for engine and appliance power
History and origin
The kilowatt is one thousand watts, a metric multiple of the SI power unit. It gives practical numbers for engines and appliances.
Current use
Kilowatts rate car engines outside the United States, large appliances and electric-vehicle charging.
Source: NIST SP 811, App. B (power). Mechanical hp = 550 ft·lbf/s ≈ 745.70 W; metric hp (PS) = 75 kgf·m/s = 735.49875 W
Where people use this
Horsepower: car and engine power in the US/UK. Kilowatts: car engines outside the US, appliances, EV charging. A 200 hp engine is about 149 kW.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, App. B (power). Mechanical hp = 550 ft·lbf/s ≈ 745.70 W; metric hp (PS) = 75 kgf·m/s = 735.49875 W.
Questions people ask
How many kW is 1 hp?
One horsepower is about 0.746 kW. To convert hp to kilowatts, multiply by 0.746.
How many kW is 200 hp?
A 200 hp engine is about 149 kW, and 100 hp is about 74.6 kW.
How do you convert hp to kW?
Multiply the horsepower by 0.746, so a 300 hp engine is about 224 kW.
How many kW is 400 hp?
400 hp is about 298 kW.