HP to kW Converter
Convert horsepower to kilowatts instantly — 1 hp = 0.7457 kW, so 100 hp = 74.57 kW. Covers mechanical and metric hp. Works both directions.
About the HP to kW Converter
This free HP to kW converter uses the mechanical (imperial) horsepower, 1 hp = 0.7457 kW. Enter horsepower to see kilowatts, or kilowatts to get horsepower — the fields convert both ways live.
Car buyers hit this conversion constantly: Japanese and European spec sheets, EV motor ratings and insurance documents quote kilowatts, while brochures and enthusiasts talk horsepower. A 150 hp sedan makes 111.9 kW; a 100 kW electric motor is about 134 hp. The same math applies to generators, water pumps and industrial motors.
Watch for metric horsepower (PS/CV), common in European and Japanese brochures — it is slightly smaller at 0.7355 kW per PS, so the same engine shows a bigger PS number than hp.
How to Use the HP to kW Converter
- 1Enter power in horsepower — kilowatts appear instantly.
- 2Or type kilowatts to convert back to hp.
- 3Copy the result, or scan the table of common engine outputs.
Frequently Asked Questions
How many kW is 100 hp?
100 mechanical horsepower equals 74.57 kW. Quick references: 70 hp (a typical 660cc-1000cc hatchback) is 52.2 kW, 150 hp is 111.9 kW and 300 hp is 223.7 kW.
What is the exact hp to kW formula?
kW = hp × 0.7457 for mechanical (imperial) horsepower, defined as 550 ft-lbf/s = 745.7 watts. To go the other way, hp = kW ÷ 0.7457, so 1 kW ≈ 1.341 hp.
What is the difference between hp and PS (metric horsepower)?
Mechanical hp = 745.7 W while metric horsepower (PS, used in Europe and Japan) = 735.5 W — about 1.4% smaller. A 100 kW engine is 134.1 hp but 136.0 PS, which is why the same car can list two slightly different "horsepower" figures.
How many horsepower is a 100 kW electric car motor?
100 kW equals 134.1 hp. EV examples: a 150 kW motor is about 201 hp, and a 250 kW performance motor is roughly 335 hp. EVs are rated in kW because electrical power is natively metric.
How many kW is a 5 hp water pump motor?
5 hp equals 3.73 kW. Common motor sizes: 1 hp = 0.746 kW, 2 hp = 1.49 kW, 10 hp = 7.46 kW. Note a motor's electrical draw is higher than its output rating due to efficiency losses.