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When the term horsepower is used, people are probably referring to mechanical horsepower.

1 BTU is equivalent to 0.293 watt-hour or 1,055 joules. BTU is commonly used to compare the energy inherent in different fuels. Coincidentally, one BTU is also roughly the amount of energy released by burning one match. The British Thermal Unit (BTU) is another unit of energy, and one unit of BTU is the amount needed to heat one pound of water by one degree Fahrenheit. Energy is often presented using units of kilowatt hours (kWh), usually within the context of electric utilities delivering energy to household consumers. On the other hand, kilowatts are commonly used for larger scale measures such as appliances and devices like refrigerators or servers. A watt is defined as one joule per second and is generally used to quantify a rate of energy transfer for lower rates of power consumption such as lightbulb or smartphone charging. Horsepower is not recognized in the International System of Units (SI) SI uses a measurement of power (a rate at which energy is generated or used) called a watt, which is named after James Watt. When measuring horsepower output of anything, to ensure precise comparisons between them, it is important to be consistent in the methodology used to determine horsepower. For more information or to do calculations on vehicle horsepower, use the Engine Horsepower Calculator. Although horsepower is an important metric for doing so, it should not be the only consideration in determining a vehicle's ability as there are other factors such as power-to-weight ratio, torque, drivetrain, and forced induction. Horsepower is commonly used today to refer to the potential work output of a vehicle's engine, and as such, is a widely cited measurement for performance comparisons.

Although its original purpose was to compare the output of steam engines with the power of horses (hence its name), it has since been adopted as a unit of measurement for all sorts of engines used to power things such as vehicles, lawn mowers, boats, chainsaws, and airplanes. Horsepower is a unit of measurement of power developed by engineer James Watt in the late 18 th century. Horsepower Calculation Based on Definition By definition Power = force×Ĭonverts between different units of power.