7 horsepower is 5.219899101 kW. The exact arithmetic is 7 × 0.7456998716 = 5.21989910108 kilowatts, using the defined factor rather than a rounded one, so this matches what a calibrated instrument would give you.
5.2199 kW is 7 mechanical horsepower and 7.097 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 129 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits.
The result sits 0.2199 kW past 5 kW, so if you need a round figure to quote, 5 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 7 that shortcut gives 5.3846154 kilowatts, off by 0.1647 kilowatts or about 3.16%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
The formula
7 hp- The quantity being converted
0.7456998716- Exact kilowatts in one horsepower
5.219899101 kW- The converted result
How it works, step by step
- Take the horsepower value, 7.
- Apply the defined factor: one horsepower is 0.7456998716 kilowatts, so multiply by that.
- The product is 5.21989910108 kilowatts.
- Going the other way, divide rather than multiply — 5.219899101 kW ÷ 0.7456998716 brings you back to 7 hp.
Worked examples
The conversion itself
Because this is a straight proportion, 7 hp × 0.7456998716 = 5.21989910108 kW — no offset, no second term, nothing else to account for.
Proving it both ways
5.219899101 kW ÷ 0.7456998716 = 7 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 7 horsepower in kilowatts?
The answer is 5.219899101 kW — or 5.21989910108 kilowatts before any rounding.
How do you convert horsepower to kilowatts?
Multiply by 0.7456998716. So 7 × 0.7456998716 = 5.219899101 kilowatts. The factor comes from a definition rather than a measurement, so it never changes.
What is 5.219899101 kilowatts back in horsepower?
7 horsepower. Dividing by 0.7456998716 undoes the conversion exactly.
What does 7 hp actually look like?
5.2199 kW is 7 mechanical horsepower and 7.097 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 129 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.
7 hp in kilowatts — nearby values
| Horsepower | Kilowatts | Unrounded |
|---|---|---|
| 1 hp | 0.74569987 | 0.7456998716 |
| 2 hp | 1.4913997 | 1.491399743 |
| 3 hp | 2.2370996 | 2.237099615 |
| 4 hp | 2.9827995 | 2.982799486 |
| 5 hp | 3.7284994 | 3.728499358 |
| 6 hp | 4.4741992 | 4.474199229 |
| 7 hp | 5.2198991 | 5.219899101 |
| 8 hp | 5.965599 | 5.965598973 |
| 9 hp | 6.7112988 | 6.711298844 |
| 10 hp | 7.4569987 | 7.456998716 |
| 11 hp | 8.2026986 | 8.202698587 |
| 12 hp | 8.9483985 | 8.948398459 |
| 13 hp | 9.6940983 | 9.694098331 |
Exact factor: 1 horsepower = 0.745699871582 kilowatts. The row for 7 hp is the value this page is about.