Power Conversions

Power measures the rate at which energy is used or produced. Watts are the SI unit used for all electrical devices worldwide, while horsepower is the traditional unit for vehicle and engine output. Converting between watts, kilowatts, horsepower, and BTU/h is necessary for comparing international vehicle specs, sizing generators, matching HVAC capacity to electric equivalents, and understanding energy consumption.

  • ✓Converting horsepower to kilowatts for international vehicle specifications
  • ✓Converting watts to BTU/h for HVAC cooling and heating capacity comparison
  • ✓Converting kilowatts to horsepower for electric motor and generator ratings
  • ✓Converting watts to kilowatts for solar panel array sizing and power bills

Most Popular Power Conversions

Horsepower → kWkW → HorsepowerWatts → KilowattsKilowatts → WattsWatts → BTU/hBTU/h → Watts

All Power Converters

Convert from Watts (W)

Watts → KilowattsWatts → MegawattsWatts → HorsepowerWatts → BTU per HourWatts → Foot-Pounds per Second

Convert from Kilowatts (kW)

Kilowatts → WattsKilowatts → MegawattsKilowatts → HorsepowerKilowatts → BTU per HourKilowatts → Foot-Pounds per Second

Convert from Megawatts (MW)

Megawatts → WattsMegawatts → KilowattsMegawatts → HorsepowerMegawatts → BTU per HourMegawatts → Foot-Pounds per Second

Convert from Horsepower (hp)

Horsepower → WattsHorsepower → KilowattsHorsepower → MegawattsHorsepower → BTU per HourHorsepower → Foot-Pounds per Second

Convert from BTU per Hour (BTU/h)

BTU per Hour → WattsBTU per Hour → KilowattsBTU per Hour → MegawattsBTU per Hour → HorsepowerBTU per Hour → Foot-Pounds per Second

Convert from Foot-Pounds per Second (ft·lbf/s)

Foot-Pounds per Second → WattsFoot-Pounds per Second → KilowattsFoot-Pounds per Second → MegawattsFoot-Pounds per Second → HorsepowerFoot-Pounds per Second → BTU per Hour

Frequently Asked Questions — Power

How many watts are in 1 horsepower?
1 mechanical horsepower equals 745.7 watts (approximately 0.7457 kW). A 200 hp car engine produces about 149.1 kW. To convert hp to kW, multiply by 0.7457.
What is the difference between watts and kilowatts?
A kilowatt (kW) equals 1,000 watts (W). Small appliances are rated in watts (a light bulb at 10 W, a microwave at 900 W). Large systems use kilowatts (an electric vehicle charger at 7–22 kW, a home solar array at 5–10 kW).
How many BTU/h are in 1 kilowatt?
1 kilowatt equals 3,412.14 BTU per hour. Air conditioner capacity is listed in BTU/h in the US (e.g., '18,000 BTU') and in kW in Europe. So an 18,000 BTU/h unit equals about 5.3 kW of cooling.

Related Conversion Categories

Energy Conversions

Convert between units of energy for physics, nutrition, and electrical applications.

Frequency Conversions

Convert between units of frequency for electronics, physics, and audio applications.

Force Conversions

Convert between units of force for physics and engineering calculations.

Want this converter on your website? Get the free embed code →