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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What is the forumula for horsepower over a given distance? | http://tinyurl.com/yb3dqn5
NEWSonWHEELS (Ramzi Aydi) Sat, 19 Dec 2009 11:17:55 -0000
What is the forumula for horsepower over a given distance? | http://tinyurl.com/yb3dqn5
horsepower to electrical energy - GM-Volt: Chevy Volt Forum http://bit.ly/6hslyj
foxzymega (Anyane Eric) Sat, 19 Dec 2009 10:59:21 -0000
horsepower to electrical energy - GM-Volt: Chevy Volt Forum http://bit.ly/6hslyj
Add horsepower and sound with the addition of an exhaust system. http://bit.ly/71sqCS #ad
auto_auctions (Automotive Auctions) Sat, 19 Dec 2009 10:05:39 -0000
Add horsepower and sound with the addition of an exhaust system. http://bit.ly/71sqCS #ad
@radomirsjarief Overall, Win7 is very nice, but you need more horsepower than for XP. 2 GB or RAM rather than my 1 GB. i945 is OK though!
beranger_v4 (Béranger) Sat, 19 Dec 2009 09:39:26 -0000
@radomirsjarief Overall, Win7 is very nice, but you need more horsepower than for XP. 2 GB or RAM rather than my 1 GB. i945 is OK though!
2011 Mustang accelerates horsepower race- The base version of the 2011 Ford Mustang, due in the spring, nose... http://bit.ly/5m7oex
FordMustangDeal (Ford Mustang Deals) Sat, 19 Dec 2009 09:26:59 -0000
2011 Mustang accelerates horsepower race- The base version of the 2011 Ford Mustang, due in the spring, nose... http://bit.ly/5m7oex
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HaikuClub (Famous Haiku ) Sat, 19 Dec 2009 08:50:23 -0000
increased horsepower / roar rumble metalflake pearl / punch it at the light #haiku #poetwist: increased horsepo.. http://bit.ly/5b0z6r

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