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How Much Horsepower Does A Horse Have?

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Horsepower has been a unit of power since the late 18th century. Image credit: Callipso88/Shutterstock.com

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Perhaps surprisingly, a horse can pump out significantly more than a single horsepower. Estimates vary, but it’s thought a horse in full gallop could produce somewhere between 12 to 14.9 horsepower.<br>What is horsepower?

Horsepower (hp) is a unit of measurement of power that describes the rate at which work is done. It’s most often used to gauge the power of a car’s engine, but it is also possible to apply it to the power potential of an animal, such as a horse.<br>In simplest terms, a single unit of horsepower is the amount of power needed to move 249 kilograms (550 pounds) by one foot in one second, which is about 745 watts.<br>The unit was first conceived around 1780 by Scottish engineer James Watt to compare the output of steam engines to a workhorse. Watt was a seller of steam engines and he was looking for a way to promote his product to a market that was largely driven by horses. By devising the unit of horsepower, he was able to show the advantages of using the steam engine and convince mill owners to ditch their horses.<br>Through some fairly loose calculations based on a single horse pulling a mill wheel for four hours, he worked out that the horse was shifting roughly the equivalent of 249 kilograms (550 pounds) by one foot in one second. However, this is not the full potential of...