This online calculator converts power from horsepower (hp, mechanical) to kilowatts (kW). Factors follow SI definitions and national metrology guidance: mechanical horsepower is exactly 745.6998716 watts, so results are traceable to SI.

Horsepower (hp) to Kilowatts (kW) Converter

Enter a power in horsepower to convert it to kilowatts.

Horsepower (hp)

Result in Kilowatts (kW)

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How to Use

  1. Enter a value in the “Horsepower (hp)” field.
  2. Set “Decimal Places” (0–10) to control rounding shown in the result and in the calculation note.
  3. Select “Convert” to compute the equivalent in kilowatts.
  4. Use “Copy Result” to copy the numeric output.
  5. Choose “Clear All” to reset inputs, result, and the calculation note.
  6. Press “Swap” button to do reverse conversions.

Definitions and Unit Facts

Horsepower (hp, mechanical) — U.S. customary/Imperial unit of power historically defined as 550 ft·lbf per second. In SI terms it is exactly 745.6998716 watts (W). Therefore 1 hp = 0.7456998716 kW and 1 kW = 1.34102209 hp. Abbreviation: hp. System: U.S. customary/Imperial. Note: metric horsepower (PS, CV) equals 735.49875 W and is not used in this calculator.

Kilowatt (kW) — SI unit of power equal to 1000 watts (W). 1 W = 1 joule per second. In U.S. customary terms relative to mechanical horsepower: 1 kW = 1.34102209 hp. Abbreviation: kW. System: SI. Common on electric motor nameplates, EV charging rates, and appliance ratings.

Horsepower (hp) to Kilowatts (kW) Calculator

Conversion Formula

kW = hp × 0.7456998716

hp = kW × 1.34102209

Source: NIST.

Conversion Table

hpkW
0.100.074570
0.200.149140
0.500.372850
0.750.559275
1.000.745700
1.501.118550
2.001.491400
3.002.237100
4.002.982799
5.003.728499
7.505.592749
10.007.456999
15.0011.185498
20.0014.913997
25.0018.642497
30.0022.370996
37.0027.590895
45.0033.556494
75.0055.927490
100.0074.569987

Real-World Examples

  • Fractional-horsepower motor (nameplate 0.5 hp): 0.372850 kW
  • Residential sump pump (nameplate 0.75 hp): 0.559275 kW
  • Treadmill DC motor (nameplate 1.0 hp continuous): 0.745700 kW
  • Window A/C fan motor (nameplate 1.5 hp): 1.118550 kW
  • Small air compressor motor (nameplate 2 hp): 1.491400 kW
  • Shop dust collector motor (nameplate 3 hp): 2.237100 kW
  • Garage air compressor motor (nameplate 5 hp): 3.728499 kW
  • Commercial blower motor (nameplate 7.5 hp): 5.592749 kW
  • NEMA industrial motor (nameplate 10 hp): 7.456999 kW
  • Elevator machine room motor (nameplate 20 hp): 14.913997 kW

What do you use this calculator for? If you would like additional power or engineering tools, please tell us in the comments and we will prioritize them.

CalcuLife.com