# Your question: How is engine power calculated?

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Mathematically, horsepower equals torque multiplied by rpm. H = T x rpm/5252, where H is horsepower, T is pound-feet, rpm is how fast the engine is spinning, and 5252 is a constant that makes the units jibe. So, to make more power an engine needs to generate more torque, operate at higher rpm, or both.

## How do I calculate engine kW?

Kilowatt is a function of torque and revolutions per minute and is calculated as following: Power (kW) = torque (Nm) x speed (revolutions per minute, or RPM) / 9.5488. So how does my car’s engine make power? By rotating an output shaft at a certain number of revolutions per minute.

## How is horsepower calculated?

The equation to calculate horsepower is simple: Horsepower = Torque x RPM / 5,252.

## How do you calculate maximum engine power?

Modern engines produce the maximum power at the average of 5500–6500 rpm.

P = Mtorque * n/9549 [kW], where:

1. Mtorque – engine torsion torque (Nm),
2. n – crankshaft revolutions (rpm),
3. 9549 – the coefficient to enter rotations in rotations per minute, and not in power factors.

## How many kW is a 5hp motor?

Three Phase Motors

MOTOR RATING HP APPROX. F.L.C. AT LINE VOLTAGE
3.7 kW 5 15
4.0 kW 5.5 16
5.5 kW 7.5 20
7.5 kW 10 27

## How many kW is a 1 hp motor?

Horsepower (metric) to Kilowatt Conversion Table

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Horsepower (metric) Kilowatt [kW]
1 horsepower (metric) 0.73549875 kW
2 horsepower (metric) 1.4709975 kW
3 horsepower (metric) 2.20649625 kW
5 horsepower (metric) 3.67749375 kW

## What is the difference between kW and horsepower?

Kilowatt is a unit used in SI (metric) system while horsepower is not a standard unit. Horsepower is not a well-defined unit, but Kilowatt is a well-defined unit. Horsepower has many forms such as break horsepower, metric horsepower, Boiler horsepower etc. Kilowatt only takes one form.

## Which is better hp or torque?

Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. Horsepower is how rapidly the vehicle can perform that work. … Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.

## What is horsepower example?

A unit that is used to measure the power of engines and motors. One unit of horsepower is equal to the power needed to lift 550 pounds one foot in one second. … An example of horsepower is the measurement of the pulling ability of a building crane. An example of horsepower is the measurement of the power of a motor.