This article is about the unit of measurement. For the machine which used horses to generate power, see horse power (machine). For other uses of hp, see HP (disambiguation).

The horsepower (hp) is the name of several non-metric units of power. In scientific discourse the term "horsepower" is rarely used due to the various definitions and the existence of an SI unit for power, the watt (W). However, the idea of horsepower persists as a legacy term in many languages, particularly in the automotive industry for listing the maximum rate of power application of internal-combustion engines.

There are two important factors to consider when evaluating a "horsepower" figure:

• Various definitions for the unit itself
• Various standards for measuring the value

These factors can be combined in unexpected ways — the true power output for an engine rated at "100 horsepower" might vary significantly from a reader's expectations. For this reason, various groups have attempted to standardize both the definition and measurement system, often leading to even more confusion. Although the SI watt is not subject to varying definitions, it can still vary based on the measurement conditions.

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@kcambell: What Raikes lks for in next gen leaders: high energy, high horsepower (smarts [book & street]), ability to get things done. #epip
rustystahl (Rusty Stahl) Thu, 05 Nov 2009 17:41:54 -0000
@kcambell: What Raikes lks for in next gen leaders: high energy, high horsepower (smarts [book & street]), ability to get things done. #epip
Dell Adamo XPS: once again, Dell wants too much money for too little horsepower http://bit.ly/2e3QLP
michaelklurfeld (Michael Klurfeld) Thu, 05 Nov 2009 17:20:54 -0000
Dell Adamo XPS: once again, Dell wants too much money for too little horsepower http://bit.ly/2e3QLP
The weekend is coming. Treat yourself to some horsepower. Our stable is fully stocked. vegasexoticrentals.com
exoticcarslv (Vegas Exotic Rentals) Thu, 05 Nov 2009 16:58:01 -0000
The weekend is coming. Treat yourself to some horsepower. Our stable is fully stocked. vegasexoticrentals.com
HorsePower TV Track Mustang Project.... Check it out http://bit.ly/4rbB6h
YearOneCars (Year One) Thu, 05 Nov 2009 16:38:36 -0000
HorsePower TV Track Mustang Project.... Check it out http://bit.ly/4rbB6h
Hey, do u know a Car like these with 3 Wheels and 130 Horsepower? Look here and find out - www.spyderfieber.de
steffenschenk (Steffen Schenk) Thu, 05 Nov 2009 16:24:02 -0000
Hey, do u know a Car like these with 3 Wheels and 130 Horsepower? Look here and find out - www.spyderfieber.de
Kijiji adds horsepower to Canada's No.1 auto classifieds site - http://bit.ly/1k6chA
daype (Daype Classifieds) Thu, 05 Nov 2009 15:20:19 -0000
Kijiji adds horsepower to Canada's No.1 auto classifieds site - http://bit.ly/1k6chA

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