150 hp to kW
- Horsepower (hp)
- 150 hp
- Kilowatts
- 111.854980737 kW
Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)
Horsepower to kilowatts converter
Convert horsepower to kilowatts (hp to kW) with the exact factor, a conversion chart and worked steps.
Kilowatts
kW
Kilowatts: 111.854980737 kW
- Conversion
- 150 hp = 111.8549807373 kW
- 1 kW in horsepower
- 1.34102209hp
150 horsepower is 111.8549807373 kilowatts. Going the other way, 1 kW is 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
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.
One horsepower is about 0.7456998716 kilowatts, so 150 hp is 111.854981 kW. To convert hp to kW, multiply by 0.7456998716; to convert back, multiply by 1.3410220896.
Mechanical horsepower is 550 foot-pounds per second, about 745.7 W; metric horsepower (PS) is 735.49875 W. The factor has no exact decimal form, so results are computed with 50 significant digits and rounded only for display.
Worked examples
400 hp to kW
- Horsepower (hp)
- 400 hp
- Kilowatts
- 298.279948633 kW
Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)
50 hp to kW
- Horsepower (hp)
- 50 hp
- Kilowatts
- 37.2849935791 kW
Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)
Questions
When would I convert hp to kW?
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.
How many kilowatts are in a horsepower?
One horsepower is about 0.7456998716 kilowatts. Mechanical horsepower is 550 foot-pounds per second, about 745.7 W; metric horsepower (PS) is 735.49875 W.
How do you convert hp to kW?
Multiply the number of horsepower by 0.7456998716. For example, 150 hp × 0.7456998716 = 111.854981 kW. To go the other way, divide by 0.7456998716.
How can I estimate hp to kW without a calculator?
Multiply by 0.75. That is 0.6% high of the exact factor 0.7456998716, so 150 hp comes out as 112.5 kW instead of 111.855.
How accurate is the horsepower to kilowatts converter?
Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “150 hp to kW” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).
Where does the method come from?
NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.
About this calculator
Sources
Checked against references
3 worked examples with independently sourced answers ship with this calculator. They run in the test suite; you can run them here too.
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