Full name: horsepower [international]
Plural form: horsepower
Category type: power
Scale factor: 745.699871582
The SI derived unit for power is the watt.
1 watt is equal to 0.0013410220896 HP.
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The term horsepower was invented by the engineer James Watt in 1782. Mechanical horsepower is defined in this way:
1 hp = 33,000 ft·pound-force·min−1 = exactly 745.69987158227022 W