Put 72 horsepower into the exact factor of 0.7456998716 and you get 53.69039075 kW. Written out: 72 × 0.7456998716 = 53.6903907539 kilowatts, with no rounding applied until the final display.
53.6904 kW is 72 mechanical horsepower and 73 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 12.6 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits.
The result sits 1.31 kW short of 55 kW, so if you need a round figure to quote, 55 kW is the honest nearest one. Plenty of people do this in their head: divide by 1.3 instead of using the exact factor 0.7456998716. At 72 that shortcut gives 55.384615 kilowatts, off by 1.694 kilowatts or about 3.16%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
The formula
72 hp- The quantity being converted
0.7456998716- Exact kilowatts in one horsepower
53.69039075 kW- The converted result
How it works, step by step
- Begin from the figure you have: 72 horsepower.
- Scale it by 0.7456998716 — that is how many kilowatts fit in a single horsepower.
- The product is 53.6903907539 kilowatts.
- Going the other way, divide rather than multiply — 53.69039075 kW ÷ 0.7456998716 brings you back to 72 hp.
Worked examples
Working it through
Take 72 hp and multiply by the factor 0.7456998716. The product is 53.6903907539 kW, and that is the entire method.
Checking it backwards
53.69039075 kW ÷ 0.7456998716 = 72 hp. Recovering the original number is the fastest way to confirm the factor was not applied upside down.
How to read your score
Frequently asked questions
What is 72 horsepower in kilowatts?
72 horsepower is exactly 53.69039075 kW. Carried to full precision that is 53.6903907539 kilowatts.
How do you convert horsepower to kilowatts?
Multiply by 0.7456998716. So 72 × 0.7456998716 = 53.69039075 kilowatts. The factor comes from a definition rather than a measurement, so it never changes.
What is 53.69039075 kilowatts back in horsepower?
Divide by 0.7456998716, or multiply by 1.34102209 — either returns 72 horsepower.
How much is 72 hp in practice?
53.6904 kW is 72 mechanical horsepower and 73 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 12.6 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits. The table lower down places it beside its neighbours so you can see where it sits.
What is a horsepower?
Mechanical horsepower, defined by James Watt as 550 foot-pounds per second.
What is a kilowatt?
The rating unit for motors, EV chargers and solar arrays.
72 hp in kilowatts — nearby values
| Horsepower | Kilowatts | Unrounded |
|---|---|---|
| 66 hp | 49.216192 | 49.21619152 |
| 67 hp | 49.961891 | 49.9618914 |
| 68 hp | 50.707591 | 50.70759127 |
| 69 hp | 51.453291 | 51.45329114 |
| 70 hp | 52.198991 | 52.19899101 |
| 71 hp | 52.944691 | 52.94469088 |
| 72 hp | 53.690391 | 53.69039075 |
| 73 hp | 54.436091 | 54.43609063 |
| 74 hp | 55.18179 | 55.1817905 |
| 75 hp | 55.92749 | 55.92749037 |
| 76 hp | 56.67319 | 56.67319024 |
| 77 hp | 57.41889 | 57.41889011 |
| 78 hp | 58.16459 | 58.16458998 |
Exact factor: 1 horsepower = 0.745699871582 kilowatts. The row for 72 hp is the value this page is about.