Result
0.0000000 mW
1 W = 1000 mW
Converter Guide
Power Converter
Watts, horsepower, BTU/hr — power measures the rate at which energy flows. Whether you're sizing a generator or comparing engines, convert between all units in seconds.
// How to Use
- Enter your power value into the input field.
- Select the input unit (e.g., Watt, HP, BTU/hr).
- Select the output unit you need.
- The conversion appears instantly, with no lag.
- Use ⇄ Invert to flip the direction in one click.
// Use Cases
Appliances
Compare power consumption in watts for electricity costs.
Automotive
Convert engine horsepower to kilowatts for EV comparisons.
HVAC
Size air conditioners by converting BTU/hr to kW.
Electronics
Work in milliwatts or dBm for signal and circuit design.
// Key Formulas
1 kW = 1,000 W
1 HP (mech.) = 745.7 W
1 HP (metric) = 735.499 W
1 BTU/hr = 0.29307 W
1 kCal/hr = 1.163 W
1 MW = 1,000,000 W
1 HP (mech.) = 745.7 W
1 HP (metric) = 735.499 W
1 BTU/hr = 0.29307 W
1 kCal/hr = 1.163 W
1 MW = 1,000,000 W
// Units Supported
WattKilowattMegawattMilliwattHorsepower (mech.)Horsepower (metric)BTU/hrkcal/hrFoot-pound/mindBm
// FAQs
▸ What's the difference between watts and kilowatts?
▸ How does horsepower relate to watts?
▸ What is a dBm used for?