How many watts is 1 horsepower?

One mechanical horsepower equals approximately 745.7 watts, while one metric horsepower (PS) equals approximately 735.5 watts. Horsepower is commonly used to rate engine and motor output.

What is the relationship between watts and joules?

1 watt = 1 joule per second. If a device uses 1,000 watts (1 kilowatt) for one hour, it consumes 3,600,000 joules (3.6 megajoules) of energy.

Power Converter

Convert power measurements between watts, horsepower, BTU per hour, and more.

From

Popular Power Conversions

kW to hp hp to kW W to BTU/h BTU/h to W MW to kW

Complete List of Power Units for Conversion

1 Kilowatt [kW] = 1000.00 Watt [W]

Kilowatt to Watt, Watt to Kilowatt

1 Megawatt [MW] = 1.00000e+6 Watt [W]

Megawatt to Watt, Watt to Megawatt

1 Gigawatt [GW] = 1.00000e+9 Watt [W]

Gigawatt to Watt, Watt to Gigawatt

1 Horsepower (Mechanical) [hp] = 745.700 Watt [W]

Horsepower (Mechanical) to Watt, Watt to Horsepower (Mechanical)

1 Horsepower (Metric) [PS] = 735.499 Watt [W]

Horsepower (Metric) to Watt, Watt to Horsepower (Metric)

1 BTU per Hour [BTU/h] = 0.293071 Watt [W]

BTU per Hour to Watt, Watt to BTU per Hour

1 Calorie per Second [cal/s] = 4.18400 Watt [W]

Calorie per Second to Watt, Watt to Calorie per Second

1 Kilocalorie per Hour [kcal/h] = 1.16300 Watt [W]

Kilocalorie per Hour to Watt, Watt to Kilocalorie per Hour

Understanding power units

The watt (W) is the SI unit of power, representing energy transfer per unit time. One watt equals one joule per second. Power measures the rate at which work is done or energy is transferred.

Common power relationships

1 kilowatt (kW) = 1,000 watts
1 horsepower (hp) ≈ 745.7 watts
1 metric horsepower ≈ 735.5 watts
1 BTU per hour ≈ 0.293 watts
1 foot-pound per second ≈ 1.356 watts

Applications of power units

Watts and kilowatts are used for electrical appliances and power plants. Horsepower is used for engines and motors, particularly in automotive and mechanical applications. BTU per hour is used in HVAC and heating systems. Foot-pounds per second are used in some engineering contexts.

Frequently Asked Questions

How many watts is 1 horsepower?: One mechanical horsepower equals approximately 745.7 watts, while one metric horsepower (PS) equals approximately 735.5 watts. Horsepower is commonly used to rate engine and motor output.
What is the relationship between watts and joules?: 1 watt = 1 joule per second. If a device uses 1,000 watts (1 kilowatt) for one hour, it consumes 3,600,000 joules (3.6 megajoules) of energy.

All Converters

Common Unit Systems