Online Calculate Tools
English

Power Unit Converter | Convert between Watts, Kilowatts, Horsepower and more

Online power unit converter supporting precise conversion between watts, kilowatts, megawatts, horsepower, BTU/h and more power units.

Watt(W)
Current Unit
Kilowatt(kW)
Formula:1 W = 0.001 kW
Calculation Process:0 W × 0.001 = undefined kW
Megawatt(MW)
Formula:1 W = 0.000001 MW
Calculation Process:0 W × 0.000001 = undefined MW
Gigawatt(GW)
Formula:1 W = 1.e-9 GW
Calculation Process:0 W × 1.e-9 = undefined GW
Milliwatt(mW)
Formula:1 W = 1000 mW
Calculation Process:0 W × 1000 = undefined mW
Horsepower (Imperial)(hp)
Formula:1 W = 0.001341 hp
Calculation Process:0 W × 0.001341 = undefined hp
Horsepower (Metric, PS)(PS)
Formula:1 W = 0.00136 PS
Calculation Process:0 W × 0.00136 = undefined PS
BTU per Hour(BTU/h)
Formula:1 W = 3.412142 BTU/h
Calculation Process:0 W × 3.412142 = undefined BTU/h
Calorie per Second(cal/s)
Formula:1 W = 0.239006 cal/s
Calculation Process:0 W × 0.239006 = undefined cal/s
Foot-pound per Second(ft·lb/s)
Formula:1 W = 0.737562 ft·lb/s
Calculation Process:0 W × 0.737562 = undefined ft·lb/s

Power Unit Knowledge

Power Unit Basics

Power is the rate at which energy is transferred or work is done. The SI unit of power is the Watt (W), equal to 1 Joule per second. Common units include kilowatt (kW), megawatt (MW), and horsepower (hp).

Common Power Conversions

  • 1 horsepower (imperial) = 745.7 W
  • 1 metric horsepower (PS) = 735.5 W
  • 1 kW = 1000 W = 1.341 hp
  • 1 BTU/h = 0.2931 W.

Horsepower

Horsepower was defined by James Watt to compare steam engine output with horse work. Imperial horsepower = 550 ft·lbf/s = 745.7 W. Metric horsepower (PS or CV) = 75 kgf·m/s = 735.5 W. Used widely for vehicle engines.

Watt and Kilowatt

The Watt is named after James Watt. Household appliances are rated in watts: a light bulb uses 60W, a microwave 1000W. Power plants generate gigawatts (GW). 1 kW = 1000 W, 1 MW = 1,000,000 W.

Power in Daily Life

Electricity bills are based on energy (kWh = kilowatt-hour). A 1 kW device running for 1 hour consumes 1 kWh. Electric vehicles typically have motors of 50–300 kW. Large power stations generate 1,000 MW or more.