# The relationship between watts and horsepower is expressed by

### Horsepower to Watts | Kyle's Converter

A power level of 1 hp is approximately equivalent to watt s (W) or kilowatt s (kW). To convert from horsepower to watts, multiply by To convert from. Dec 13, Originally Answered: What is the relation between horse power and watt power? . So the power conversion of horsepower to kilowatts is given by. As nouns the difference between watt and horsepower is that watt is in the international system of units, the derived unit of power; the power of a system in which.

Shaft horsepower[ edit ] Shaft horsepower shp is the power delivered to a propeller shaft, a turbine shaft — or to an output shaft of an automotive transmission. Shaft horsepower is a common rating for jet engines, industrial turbines, and some marine applications. Reciprocating internal-combustion automobile engines are rated instead in the US by SAE certified net power, which is measured at the engine's crankshaft, and so does not account for losses in the transmission.

**How To Compute Horsepower**

Equivalent shaft horsepower eshp is sometimes used to rate turboprop engines. It includes the equivalent power derived from jet thrust. The vehicle is generally attached to the dynamometer and accelerates a large roller and Power Absorbing Unit which is driven by the vehicle's drive wheel s.

The actual power is then computer calculated based on the rotational inertia of the roller, its resultant acceleration rates and power applied by the Power Absorbing Unit. Some motor vehicle and motorbike dynamometers can also be purely inertia-based where the power output is calculated from measuring the acceleration of a roller drum with a known rotational inertia and known parasitic frictional losses of the roller drum's bearings.

Engine power test standards[ edit ] There exist a number of different standard determining how the power and torque of an automobile engine is measured and corrected.

Correction factors are used to adjust power and torque measurements to standard atmospheric conditions, to provide a more accurate comparison between engines as they are affected by the pressure, humidity, and temperature of ambient air.

This contrasts with both SAE net power and DIN standards, which account for engine accessories but not transmission losses.

## Convert Horsepower to Watts

The atmospheric correction standards for barometric pressure, humidity and temperature for SAE gross power testing were relatively idealistic. Like SAE gross and other brake horsepower protocols, SAE net hp is measured at the engine's crankshaft, and so does not account for transmission losses. However, similar to the DIN standard, SAE net power testing protocol calls for standard production-type belt-driven accessories, air cleaner, emission controls, exhaust system, and other power-consuming accessories.

This produces ratings in closer alignment with the power produced by the engine as it is actually configured and sold.

The first engine certified under the new program was the 7. While Toyota and Honda are retesting their entire vehicle lineups, other automakers generally are retesting only those with updated powertrains. For example, the Ford Five Hundred is rated at horsepower, the same as that of model. However, the rating does not reflect the new SAE testing procedure, as Ford is not going to incur the extra expense of retesting its existing engines.

### Watts to Horsepower | Kyle's Converter

Over time, most automakers are expected to comply with the new guidelines. SAE tightened its horsepower rules to eliminate the opportunity for engine manufacturers to manipulate factors affecting performance such as how much oil was in the crankcase, engine control system calibration, and whether an engine was tested with premium fuel. The SI unit of electric power is the watt. Using the Power Converter Converter This online unit converter allows quick and accurate conversion between many units of measure, from one system to another.

## Unit Converter

The Unit Conversion page provides a solution for engineers, translators, and for anyone whose activities require working with quantities measured in different units. Learn Technical English with Our Videos!

You can use this online converter to convert between several hundred units including metric, British and American in 76 categories, or several thousand pairs including acceleration, area, electrical, energy, force, length, light, mass, mass flow, density, specific volume, power, pressure, stress, temperature, time, torque, velocity, viscosity, volume and capacity, volume flow, and more.

Integers numbers without a decimal period or exponent notation are considered accurate up to 15 digits and the maximum number of digits after the decimal point is In this calculator, E notation is used to represent numbers that are too small or too large.

- Watts to horsepower conversion
- Horsepower to watts conversion
- Convert watts to hp

E-notation is commonly used in calculators and by scientists, mathematicians and engineers. Select the unit to convert from in the left box containing the list of units.

Select the unit to convert to in the right box containing the list of units. The result will appear in the Result box and in the To box.