Power converter (kW, hp, PS)
Convert any power unit via the watt. Exact factors, the arithmetic for your input, all equivalents and a car-engine table of kW, PS and hp.
Defaults to your region. Switch to compare any other scale.
Canonical unit is the watt. 1 PS = 735.49875 W; 1 hp = 745.69987 W; 1 hp(E) = 746 W.
Result
134.102209 hp
kW → hp
100 kW × 1,000 = 100,000 W; 100,000 W ÷ 745.69987158227 = 134.102209 hp
- In watts (SI)100,000 W
- How calculated100 kW × 1,000 = 100,000 W; 100,000 W ÷ 745.69987158227 = 134.102209 hp
- Factor (from)1 kW = 1 kW = 1000 W
- Factor (to)1 hp = 550 ft·lbf/s = 745.69987158227 W
- Cross rate1 kW = 1.341022 hp
- kW (kilowatt)100 kW
- MW (megawatt)0.1 MW
- PS (metric horsepower)135.962162 PS
- hp (mechanical / imperial horsepower)134.102209 hp
- hp(E) (electrical horsepower)134.048257 hp(E)
- hp(S) (boiler horsepower)10.1942 hp(S)
- BTU/h (British thermal units per hour)341,214.163 BTU/h
- kcal/h (kilocalories per hour)85,984.523 kcal/h
- ft·lbf/s (foot-pound-force per second)73,756.215 ft·lbf/s
- erg/s (CGS)1 × 10^12 erg/s
PS vs hp: not the same
1 metric horsepower (PS) = 735.49875 W; 1 mechanical horsepower (hp) = 745.69987 W, about 1.4% more. Factors: NIST SP 811 Appendix B, BIPM SI.
Typical car engines: kW ↔ PS ↔ hp
| kW | PS | hp | Watts |
|---|---|---|---|
| 44 | 59.8 | 59.0 | 44,000 |
| 55 | 74.8 | 73.8 | 55,000 |
| 66 | 89.7 | 88.5 | 66,000 |
| 74 | 100.6 | 99.2 | 74,000 |
| 85 | 115.6 | 114.0 | 85,000 |
| 96 | 130.5 | 128.7 | 96,000 |
| 110 | 149.6 | 147.5 | 110,000 |
| 125 | 170.0 | 167.6 | 125,000 |
| 150 | 203.9 | 201.2 | 150,000 |
| 180 | 244.7 | 241.4 | 180,000 |
| 220 | 299.1 | 295.0 | 220,000 |
| 300 | 407.9 | 402.3 | 300,000 |
About this tool
Every power conversion goes through the SI watt (1 W = 1 J/s): watts = value × factor_from; result = watts ÷ factor_to.
There are several "horsepowers". The metric horsepower (PS in German, CV in Italian/Spanish/French, ZS in Latvian) is defined as 75 kilogram-force metres per second = 75 × 9.80665 = 735.49875 W exactly. The mechanical (imperial) horsepower, used in the US and UK, is 550 foot-pound-force per second = 745.69987 W, about 1.4% more. So 1 hp ≈ 1.01387 PS and 100 kW ≈ 135.96 PS ≈ 134.10 hp. European car registration documents state engine power in kW; brochures often add PS. The electrical horsepower is exactly 746 W and the boiler horsepower (≈ 9809.5 W) describes steam boilers, not engines.
Heating and cooling use BTU/h (1 kW ≈ 3412.14 BTU/h) and kcal/h (1 kW ≈ 859.85 kcal/h, with the International Table calorie 4.1868 J). Factors follow NIST SP 811 Appendix B and the BIPM SI Brochure.
Formula
watts = value × factor_fromresult = watts ÷ factor_to1 PS = 75 kgf·m/s = 735.49875 W (exact)1 hp = 550 ft·lbf/s = 745.69987158 W (exact)kW → PS: × 1.35962162kW → hp: × 1.341022091 hp = 1.01386967 PS
How it is calculated
- Enter a power value and choose From / To units.
- Convert to watts: watts = value × factor_from (e.g. 1 PS = 735.49875 W).
- Convert to the target: result = watts ÷ factor_to.
- Check the result rows for every other unit at once.
- Use the table for typical car engine powers in kW, PS and hp.
Questions
How many PS is 1 kW?
1 kW = 1000 ÷ 735.49875 ≈ 1.35962 PS. Quick rule: kW × 1.36 ≈ PS, and PS × 0.7355 ≈ kW. Example: 110 kW ≈ 149.6 PS.
What is the difference between PS and hp?
PS (metric) = 735.49875 W, based on lifting 75 kg by 1 m in 1 s. hp (mechanical) = 745.69987 W, based on 550 ft·lbf/s. hp is about 1.4% larger, so the same engine has a slightly higher number in PS than in hp: 150 PS ≈ 147.9 hp.
How do I convert hp to kW?
Multiply by 0.745699872. Example: 300 hp × 0.7457 ≈ 223.7 kW. For metric PS use 0.73549875 instead.
Why does my car document show kW, not horsepower?
The watt is the SI unit, and EU law (Directive 80/181/EEC) makes kW the legal unit for engine power; PS may appear only as a supplementary figure. Use this converter to translate the kW figure.
How many BTU/h is 1 kW?
About 3412.14 BTU/h (International Table BTU = 1055.05585262 J). A 9000 BTU/h air conditioner is ≈ 2.64 kW of cooling.
Are the results official metrology advice?
No. Calculate This is educational. For type approval, taxation or legal metrology, rely on official documents and calibrated measurements.