Put 55 kilowatts into the exact factor of 1.34102209 and you get 73.75621493 hp. Written out: 55 × 1.34102209 = 73.7562149277 horsepower, with no rounding applied until the final display.
55 kW is 73.76 mechanical horsepower and 74.78 metric PS. Put that through a 1,400 kg car at 80% drivetrain efficiency and the energy needed to reach 100 km/h — 540.1 kJ — takes about 12.3 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits.
The result sits 1.244 hp short of 75 hp, so if you need a round figure to quote, 75 hp is the honest nearest one. Plenty of people do this in their head: multiply by 1.3 instead of using the exact factor 1.34102209. At 55 that shortcut gives 71.5 horsepower, off by 2.256 horsepower or about 3.06%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
The formula
55 kW- The quantity being converted
1.34102209- Exact horsepower in one kilowatt
73.75621493 hp- The converted result
How it works, step by step
- Start with 55 kilowatts.
- Multiply by 1.34102209, the exact number of horsepower in one kilowatt.
- Result: 73.7562149277 horsepower.
- The reverse works the same way with division: 73.75621493 hp ÷ 1.34102209 = 55 kW.
Worked examples
The conversion itself
Take 55 kW and multiply by the factor 1.34102209. The product is 73.7562149277 hp, and that is the entire method.
Checking it backwards
Run it in reverse — 73.75621493 hp ÷ 1.34102209 = 55 kW. Matching the input you started from is the proof the direction is right.
How to read your score
Frequently asked questions
What is 55 kilowatts in horsepower?
The answer is 73.75621493 hp — or 73.7562149277 horsepower before any rounding.
How do you convert kilowatts to horsepower?
Multiply by 1.34102209. So 55 × 1.34102209 = 73.75621493 horsepower. The factor comes from a definition rather than a measurement, so it never changes.
What is 73.75621493 horsepower back in kilowatts?
Divide by 1.34102209, or multiply by 0.7456998716 — either returns 55 kilowatts.
How much is 55 kW in practice?
55 kW is 73.76 mechanical horsepower and 74.78 metric PS. Put that through a 1,400 kg car at 80% drivetrain efficiency and the energy needed to reach 100 km/h — 540.1 kJ — takes about 12.3 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits. Compare it against the surrounding values in the table below.
What is a kilowatt?
The rating unit for motors, EV chargers and solar arrays.
What is a horsepower?
Mechanical horsepower, defined by James Watt as 550 foot-pounds per second.
55 kW in horsepower — nearby values
| Kilowatts | Horsepower | Unrounded |
|---|---|---|
| 49 kW | 65.710082 | 65.71008239 |
| 50 kW | 67.051104 | 67.05110448 |
| 51 kW | 68.392127 | 68.39212657 |
| 52 kW | 69.733149 | 69.73314866 |
| 53 kW | 71.074171 | 71.07417075 |
| 54 kW | 72.415193 | 72.41519284 |
| 55 kW | 73.756215 | 73.75621493 |
| 56 kW | 75.097237 | 75.09723702 |
| 57 kW | 76.438259 | 76.43825911 |
| 58 kW | 77.779281 | 77.7792812 |
| 59 kW | 79.120303 | 79.12030329 |
| 60 kW | 80.461325 | 80.46132538 |
| 61 kW | 81.802347 | 81.80234747 |
Exact factor: 1 kilowatt = 1.3410220896 horsepower. The row for 55 kW is the value this page is about.