HP to kW Converter
Updated Formulas shown
Multiply mechanical horsepower by 0.745700 to get kilowatts: 1 hp = 745.7 W. Metric horsepower (PS, CV) is slightly smaller — 735.5 W.
Formula: kilowatts = horsepower ÷ 1.3410220896 (exact ratio, shown rounded)
Common values: horsepower → kilowatts
| horsepower | kilowatts |
|---|---|
| 0.7457 kW | |
| 1.4914 kW | |
| 2.2371 kW | |
| 3.7285 kW | |
| 7.457 kW | |
| 14.914 kW | |
| 18.6425 kW | |
| 37.285 kW | |
| 74.57 kW | |
| 186.425 kW | |
| 372.85 kW | |
| 745.7 kW |
1 hp in every power unit
- 745.7 W
- 0.7457 kW
- 0.0007457 MW
- 1.01387 PS
- 2,544.43 BTU/h
- 0.212036 ton (AC)
- 641.616 kcal/h
How to convert horsepower to kilowatts
- Type the value in horsepower into the converter (or into the right-hand box to go the other way).
- Divide by 1.3410220896 to get kilowatts.
- Round to a sensible precision with the Decimals control; the table below covers the values people look up most.
Horsepower to kilowatt formula
kilowatts = horsepower ÷ 1.3410220896 — 1 hp = 0.74569987 kW. Both units are defined exactly (NIST SP 811); the factor above is rounded to 10 decimals, and the converter uses the full-precision ratio.
hp to kW conversion table
| hp | kW | watts | metric hp (PS) |
|---|---|---|---|
| 0.25 | 0.186 | 186 | 0.25 |
| 0.33 | 0.246 | 246 | 0.33 |
| 0.5 | 0.373 | 373 | 0.51 |
| 0.75 | 0.559 | 559 | 0.76 |
| 1 | 0.746 | 746 | 1.01 |
| 1.5 | 1.119 | 1,119 | 1.52 |
| 2 | 1.491 | 1,491 | 2.03 |
| 3 | 2.237 | 2,237 | 3.04 |
| 5 | 3.728 | 3,728 | 5.07 |
| 7.5 | 5.593 | 5,593 | 7.6 |
| 10 | 7.457 | 7,457 | 10.14 |
| 15 | 11.185 | 11,185 | 15.21 |
| 20 | 14.914 | 14,914 | 20.28 |
| 25 | 18.642 | 18,642 | 25.35 |
| 50 | 37.285 | 37,285 | 50.69 |
| 100 | 74.57 | 74,570 | 101.39 |
| 150 | 111.855 | 111,855 | 152.08 |
| 200 | 149.14 | 149,140 | 202.77 |
| 300 | 223.71 | 223,710 | 304.16 |
| 500 | 372.85 | 372,850 | 506.93 |
Motor horsepower is output
A motor's nameplate hp is shaft output. It draws more electrical power because no motor is 100% efficient: a 1 hp pool pump at about 75% efficiency pulls roughly 1,000 W. The nameplate full-load amps (FLA) is what you size the circuit to — the wire size calculator takes it from there.
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Frequently asked questions
How many kW is 1 hp?
0.7457 kW (745.7 W).
How many watts does a 1 hp motor use?
About 900–1,100 W of electricity at full load, depending on efficiency; its output is 746 W.
What is the difference between hp and PS?
Mechanical hp (550 ft·lbf/s) = 745.7 W; metric hp (PS/CV) = 735.5 W. European car specs use PS or kW.
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