How to convert horsepower to kilowatts
Useful tips for motorists

How to convert horsepower to kilowatts

All car owners have heard about the presence of such a parameter as horsepower in a car, saw their value in the STS and faced with the calculation of the amount of OSAGO and transport tax based on this indicator, but only a few know in more detail about this indicator, what it means and what it is connected with .

What is horsepower and how did it come about

How to convert horsepower to kilowatts

Horsepower (Russian: h.p., ang .: hp, German: PS, fran .: CV) is a non-systemic unit of power, first described by James Watt from Scotland in the 17th century.

He developed the first steam plant, and to demonstrate that his apparatus is capable of replacing far more than one horse, he introduced such a parameter as horsepower.

According to the inventor's observations, an ordinary horse is capable of lifting a load weighing about 75 kg from a shaft at a constant speed of 1 m / s for an extended period of time.

He calculated the hp. as a load weighing 250 kilograms, which is capable of lifting a horse to a height of 30 centimeters in 1 second, that is, 1 hp \u75d 735,499 kgm / s or XNUMX watts.

Due to the fact that such measurements can give very different results, many varieties of horsepower (electric, metric, boiler, mechanical, etc.) have appeared in everyday life.

In 1882, at one of the congresses of the English Association of Engineers, it was decided to create a new unit that measures power, and it was named after the inventor - watt (W, W).

Up to this point, most calculations were carried out using the indicator introduced by the Scottish inventor D. Watt - horsepower.

How HP is measured in Russia and other countries

Today, there are several varieties of units with this name all over the world.

How to convert horsepower to kilowatts

Main varieties:

  • metric, equal to 735,4988 W;
  • mechanical, equal to 745,699871582 W;
  • indicator, equal to 745,6998715822 W;
  • electric, equal to 746 W;
  • boiler room, equal to 9809,5 watts.

The official international unit for calculating power is the watt.

In many European countries, the so-called "metric" horsepower is used, calculated as the power spent on lifting an object weighing 75 kg at the same speed with a standard acceleration g \u9,80665d XNUMX m / s².

Its value is considered to be 75 kgf m/s or 735,49875 W.

In the UK and the United States of America, the auto industry considers horsepower to be 745,6998815 watts, or 1,0138696789 metric varieties. In America, in addition to metric, boiler and electric varieties of l are used. With.

At the moment, in the Russian Federation, the term "horsepower" is nominally withdrawn from official circulation, although it is used to calculate the tax on transport and OSAGO. In Russia, this indicator is understood as a metric variety.

Engine power

To measure the power of internal combustion engines of vehicles, not only various indicators are used, but also measurement methods that give different results.

Torque, rpm and engine power. In simple words

In Europe, the standardized unit of the power measurement method is the kilowatt. When specifying horsepower, the way it is measured in different parts of the world can vary markedly, even with the same value of the original indicator.

In the USA and Japan, their own methodology is used to calculate the LS of the internal combustion engine, but they have long been almost completely brought to the generally accepted standard.

In these countries, two variations of indicators are used:

ICE automakers measure power indicators on the type of fuel for which the engine was designed.

For example, the motor is designed to run on 95 gasoline, then it will show the power declared by the manufacturer on the appropriate fuel and is unlikely to be Russian bottling. And in Japanese industries producing internal combustion engines, testing and measuring power takes place on fuel with the highest octane rating available for Japan, that is, not lower than AI-100.

An example of calculating hp in Watts and Kilowatts

It is easy to convert horsepower to watts on your own using a certain formula and a fixed value that reflects the number of watts with one such force.

For example, in the documents for the car, the power of its engine is 107 hp.

Knowing that 1 hp = 0,73549875 kW or 1 hp = 735,498, we calculate:

P=107*hp=107*0,73549875=78,69 kW or P=107*735.498=78698.29 W

How to quickly convert horsepower to kilowatts - online calculators

Despite the simplicity of converting horsepower to watts, sometimes such information may be urgently needed, and there will be no calculator at hand or time will be running out.

In such cases, you can resort to calculations using online calculators.

Some of them can be used directly in the Yandex search engine.

How to convert horsepower to kilowatts

Or by following the links below:

Despite the fact that horsepower is a parameter that is not related to the international system of units, and is currently used occasionally in some countries, its value still invariably accompanies any car owner.

It is equal to a certain number of watts, based on the type of hp. to calculate the power of the internal combustion engine in kW, the metric version of this indicator is used, equal to 1 hp \u0,73549875d XNUMX.

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