150 hp to kW
- Horsepower (hp)
- 150 hp
- Kilowatts
- 111.854980737 kW
Checked against: Exact-fraction computation from the legal unit definitions
Horsepower to kilowatts converter
Convert horsepower to kilowatts (hp to kW) with the exact factor, a conversion chart and worked steps.
By AdminDrafted with AI writing toolsUpdated Checked examples: 3
Kilowatts
kW
Kilowatts: 111.854980737 kW
- Conversion
- 150 hp = 111.8549807373 kW
- 1 kW in horsepower
- 1.34102209hp
150 hp is about 111.8549807373 kW. In the other direction, 1 kW ≈ 1.34102209 hp.
Horsepower to kilowatts
Hp to kW chart
| Horsepower | Kilowatts |
|---|---|
| 50 | 37.285 |
| 100 | 74.57 |
| 150 | 111.855 |
| 200 | 149.14 |
| 250 | 186.425 |
| 300 | 223.71 |
| 400 | 298.2799 |
| 500 | 372.8499 |
How it's calculated S
Conversion factor
Rounded here for display; the calculation uses 50 significant digits.
Multiply
About the horsepower to kilowatts converter
To convert horsepower to kilowatts, multiply by 0.7456998716; to convert back, multiply by 1.3410220896. For example, 150 hp is about 111.854981 kW. Displayed factors and results may be rounded.
A horsepower specification may describe an engine or motor. This conversion uses mechanical horsepower, which differs from metric PS. Compare the same kind of rating and test conditions: peak engine output and continuous electrical power are not interchangeable specifications.
Mechanical horsepower is 550 ft·lbf/s, about 745.7 W; metric horsepower (PS) is 735.49875 W.
Both units are defined exactly. Calculations use 50 significant digits and round only for display.
How to convert hp to kW
Multiply horsepower by 0.7457: kW = hp × 0.7457. So 1 hp = 0.746 kW, 100 hp = 74.57 kW and 150 hp = 111.85 kW. This is mechanical horsepower, used for US and UK ratings; European metric horsepower (PS) is smaller and converts at 0.7355.
Where 0.7457 comes from
Horsepower (hp) is defined as 550 foot-pounds-force per second. With the international foot, the avoirdupois pound and standard gravity, that is 745.69987158227022 W, or about 0.7457 kW (NIST).
Rounding to 746 W per horsepower is 0.04% high, close enough for any engine or motor figure.
Horsepower to kilowatts chart
| Horsepower (hp) | Kilowatts (kW) |
|---|---|
| 0.5 | 0.372849935791 |
| 1 | 0.745699871582 |
| 2 | 1.49139974316 |
| 5 | 3.72849935791 |
| 10 | 7.45699871582 |
| 25 | 18.6424967896 |
| 50 | 37.2849935791 |
| 75 | 55.9274903687 |
| 100 | 74.5699871582 |
| 150 | 111.854980737 |
| 200 | 149.139974316 |
Which horsepower is on the label?
- Mechanical hp (745.7 W): US and UK engine ratings, often written bhp.
- Metric hp (735.49875 W): labeled PS, CV or pk on European documents. 150 PS is 110.32 kW, against 111.85 kW for 150 mechanical hp.
- Electric hp (exactly 746 W): a rounded definition used for some electric motors.
Motor ratings: shaft output versus power drawn
A motor's horsepower rating is the power at its shaft. The electricity it draws is higher because of losses: a 10 hp motor delivers 7.46 kW and, at 90% efficiency, draws about 8.29 kW.
Use the drawn figure for running-cost estimates; the electricity cost calculator turns kW and hours into cost.
Engine power: crank versus wheels
Published engine horsepower is normally measured at the crankshaft. A chassis dynamometer measures power at the wheels, which is lower after drivetrain losses.
Convert like with like: a crank figure in hp becomes a crank figure in kW. The horsepower calculator estimates wheel power from a crank figure.
Common mistakes
- Mixing PS and hp. Converting a European 150 PS with the 0.7457 factor overstates it by 1.5 kW.
- Confusing kW with kWh. kW is a rate. A 2 hp pool pump delivers 1.49 kW, and over 8 hours that is 11.9 kWh of work at the shaft.
- Converting torque. Torque in lb-ft or N·m is not power; turning it into horsepower also needs the engine speed.
Kilowatts back to horsepower
Multiply kilowatts by 1.341, or use the kW to hp converter. The power converter adds watts, BTU per hour and tons of refrigeration.
Worked examples
400 hp to kW
- Horsepower (hp)
- 400 hp
- Kilowatts
- 298.279948633 kW
Checked against: Exact-fraction computation from the legal unit definitions
50 hp to kW
- Horsepower (hp)
- 50 hp
- Kilowatts
- 37.2849935791 kW
Checked against: Exact-fraction computation from the legal unit definitions
Questions
How many kilowatts is one horsepower?
1 hp is about 0.7456998716 kW. Mechanical horsepower is 550 ft·lbf/s, about 745.7 W; metric horsepower (PS) is 735.49875 W.
How do I convert horsepower to kilowatts?
Multiply by 0.7456998716: 150 hp × 0.7456998716 ≈ 111.854981 kW. To convert back, divide by the same factor. The factor shown may be rounded.
How can I estimate horsepower in kilowatts without a calculator?
Multiply by 0.75. This is 0.6% above the exact factor (about 0.7456998716), so 150 hp comes out as 112.5 kW instead of 111.855 kW.
About this calculator
Sources
Checked against references
This calculator includes 3 worked examples with independently sourced answers. They run in the test suite, and you can run them here too.