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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.
Formule
1 HP = 745.7 W | HP = Torque(lb-ft) × RPM / 5252
- HP
- Horsepower (hp)
- τ
- Torque (lb-ft)
- RPM
- Revolutions Per Minute (rev/min)
Guide étape par étape
- 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
Exemples résolus
Entrée
200 HP engine
Résultat
149.1 kW or 202.8 CV (metric horsepower)
Entrée
100 kW electric motor
Résultat
134.1 HP or 135.9 PS
Questions fréquentes
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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