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Horsepower (hp) is a unit of power originally defined by James Watt to compare steam engine output to horse work. One mechanical horsepower = 745.7 watts. Metric horsepower (CV/PS) = 735.5 watts.

공식

1 HP = 745.7 W | HP = Torque(lb-ft) × RPM / 5252

HP: Horsepower (hp)
τ: Torque (lb-ft)
RPM: Revolutions Per Minute (rev/min)

단계별 가이드

11 HP (mechanical) = 745.7 W
21 CV/PS (metric) = 735.5 W
3Power (W) = Torque (N·m) × Angular velocity (rad/s)
4kW = HP × 0.7457; HP = kW × 1.341

풀어진 예시

입력

200 HP engine

결과

149.1 kW or 202.8 CV (metric horsepower)

입력

100 kW electric motor

결과

134.1 HP or 135.9 PS

자주 묻는 질문

Why is it called "horsepower"?

James Watt coined the term by measuring how much work a horse could do. One horse could lift 550 pounds 1 foot in 1 second — that became the standard.

Is horsepower the same as torque?

No. Torque is rotational force. Horsepower is the rate at which work is done. A given torque at higher RPM produces more horsepower.

Why do cars list both torque and horsepower?

Torque determines acceleration at a given RPM. Horsepower determines top speed. Both matter for understanding engine performance.

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