How many kW is 21 HP?

21 mechanical horsepower = 15.66 kW. The exact factor is 1 HP = 0.7457 kW.

What is 21 HP in PS (metric horsepower)?

21 HP = 21.29 PS. Metric HP (PS/CV) is slightly smaller than mechanical HP: 1 PS = 0.9863 HP.

Multiply HP by 0.746 for a close approximation: 21 × 0.746 = 15.67 kW. The exact answer is 15.66 kW.

21 HP is small-engine territory — generators, lawn equipment, scooters, and small outboard motors.

21 HP equals 15.66 kW.

Formula: HP × 0.7457 = kW

21 HP =

15.66kW

Metric HP (PS)

21.29 PS

Watts

15,659.7 W

21 HP is typical of small engines — lawn mowers, generators, scooters, and outboard motors.

Computed to 3 decimal places using factor 0.7457. For engineering or safety-critical uses verify against a calibrated reference.

Reference table

horsepower (HP)	kilowatts (kW)	Metric HP (PS)	Watts
6 HP	4.47 kW	6.08 PS	4,474.2 W
11 HP	8.2 kW	11.15 PS	8,202.7 W
16 HP	11.93 kW	16.22 PS	11,931.2 W
21 HP	15.66 kW	21.29 PS	15,659.7 W
26 HP	19.39 kW	26.36 PS	19,388.2 W
31 HP	23.12 kW	31.43 PS	23,116.7 W
36 HP	26.85 kW	36.5 PS	26,845.2 W
41 HP	30.57 kW	41.57 PS	30,573.7 W
46 HP	34.3 kW	46.64 PS	34,302.2 W
51 HP	38.03 kW	51.71 PS	38,030.7 W

By use case

Economy car

city / commuter

Sport car

hot hatch / sports sedan

Supercar

flagship performance

Hypercar

extreme performance

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FAQ

How many kW is 21 HP?: 21 mechanical horsepower = 15.66 kW. The exact factor is 1 HP = 0.7457 kW.
What is 21 HP in PS (metric horsepower)?: 21 HP = 21.29 PS. Metric HP (PS/CV) is slightly smaller than mechanical HP: 1 PS = 0.9863 HP.
How do I convert 21 HP to kW without a calculator?: Multiply HP by 0.746 for a close approximation: 21 × 0.746 = 15.67 kW. The exact answer is 15.66 kW.
What kind of engine has 21 HP?: 21 HP is small-engine territory — generators, lawn equipment, scooters, and small outboard motors.

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