# Watts to horsepower conversion

### Watts to horsepower conversion calculator

Watts (W) to horsepower, power conversion calculator.

Enter the power in watts and press the Convert button:

 Enter watts: W Result in mechanical horsepower: hp(I) Result in electrical horsepower: hp(E) Result in metric horsepower: hp(M)

Horsepower to watts conversion ►

#### Watts to horsepower

One watt is the power equal to the rate of energy of one joule per second in an electrical circuit. One watt is also equal to the power produced in a circuit with a voltage potential of one volt with a current of one amp.

The watt is the SI derived unit for power in the metric system. Watts can be abbreviated as W; for example, 1 watt can be written as 1 W.

The term horsepower was adopted by Scottish inventor James Watt to measure the power output of his steam engine and to compare that power with that of horses horses. Horsepower were later used to measure the power output of piston and turbine engines and electrical motors.

There are now several different types of horsepower, including mechanical, electrical, metric, boiler, brake, and indicated, and they all have different applications in industry. Mechanical and electric are the most commonly used types.

#### Watts to mechanic / hydraulic horsepower

One mechanic or hydraulic horsepower is equal to 745.699872 watts:

1 hp(I) = 745.699872 W

So the power conversion of watts to horsepower is given by:

P(hp) = P(W) / 745.699872

#### Example

Convert 10W to mechanic horsepower:

P(hp) = 10W / 745.699872 = 0.01341 hp

#### Watts to electrical horsepower

One electrical horsepower is equal to 746 watts:

1 hp(E) = 746 W

So the power conversion of watts to horsepower is given by:

P(hp) = P(W) / 746

#### Example

Convert 10W to electrical horsepower:

P(hp) = 10W / 746 = 0.013405 hp

#### Watts to metric horsepower

One metric horsepower is equal to 735.49875 watts:

1 hp(M) = 735.49875 W

So the power conversion of watts to horsepower is given by:

P(hp) = P(W) / 735.49875

#### Example

Convert 10W to metric horsepower:

P(hp) = 10W / 735.49875 = 0.013596 hp

Horsepower to watts conversion ►