Power Converter

Convert between different power units including watts, kilowatts, horsepower, BTUs per hour, and more. Perfect for electrical engineering, mechanical systems, and power calculations.

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Common Conversions
Quick access to frequently used conversions
Unit Information

Metric Units

International System of Units (SI) measurements

W
metric
Watt
Base unit of power in the SI system
kW
metric
Kilowatt
1000 watts, common unit for electrical power
MW
metric
Megawatt
1 million watts, power plant capacity unit
GW
metric
Gigawatt
1 billion watts, large power system unit
mW
metric
Milliwatt
0.001 watts, small electronic power unit
μW
metric
Microwatt
0.000001 watts, very small power unit
nW
metric
Nanowatt
0.000000001 watts, nano-scale power unit

Imperial Units

Traditional British and American measurements

hp
imperial
Horsepower
Mechanical power unit, 1 hp = 550 ft-lbf/s
BTU/hr
imperial
BTU per Hour
Thermal power unit, heating/cooling capacity
BTU/min
imperial
BTU per Minute
BTU per minute, higher thermal power unit
BTU/s
imperial
BTU per Second
BTU per second, very high thermal power

Scientific Units

Scientific and technical measurements

ft-lbf/s
scientific
Foot-pound Force per Second
Mechanical power unit, 1 ft-lbf/s = 1.35582 W
ft-lbf/min
scientific
Foot-pound Force per Minute
Lower mechanical power unit
ft-lbf/hr
scientific
Foot-pound Force per Hour
Very low mechanical power unit
erg/s
scientific
Erg per Second
CGS unit of power, 1 erg/s = 10⁻⁷ W
cal/s
scientific
Calorie per Second
Thermal power unit, 1 cal/s = 4.184 W
kcal/s
scientific
Kilocalorie per Second
1000 cal/s, high thermal power unit
Preferences

Common Use Cases

  • •Electrical Engineering: Power ratings, circuit design, efficiency
  • •Mechanical Systems: Engine power, pump capacity, motor ratings
  • •HVAC Systems: Heating/cooling capacity, thermal power
  • •Electronics: Device power consumption, battery life
  • •Renewable Energy: Solar panel output, wind turbine capacity

Popular Conversions

1 kW→1.341 hp
1 hp→2544.4 BTU/hr
1000 BTU/hr→293.1 W
1 W→1000 mW

How Our Power Converter Works

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Enter Power Value

Input any power value in the "From" field. Our converter accepts decimal numbers and scientific notation.

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Select Units

Choose your source unit (e.g., kW) and target unit (e.g., hp) from our comprehensive unit selection.

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Get Instant Result

View the converted power value in real-time. Copy results, explore common conversions, or check conversion history.

Understanding Power Units

SI Units (Metric)

W (Watt)
Base unit in the SI system. 1 W = 1 J/s = 1 Nā‹…m/s
kW (Kilowatt)
1000 watts, common unit for electrical power and appliances.

Imperial Units

hp (Horsepower)
Mechanical power unit, 1 hp = 550 ft-lbf/s = 745.7 W.
BTU/hr
British Thermal Unit per hour, thermal power unit for HVAC.

Engineering Units

ft-lbf/s
Foot-pound force per second, mechanical power unit.
cal/s
Calorie per second, thermal power unit.

Frequently Asked Questions

How accurate is this power converter?

Our power converter uses precise conversion factors and maintains accuracy up to 8 decimal places. All conversions are based on internationally recognized standards.

Can I convert negative power values?

Yes, our converter supports negative values for applications like relative power measurements, power flow direction, or scientific calculations.

What is the highest power value I can convert?

Our converter can handle power values from -1 trillion to 1 quadrillion units, covering everything from microelectronics to power plant capacities.

How do I use scientific notation?

Enable "Show scientific notation" in preferences for very large or small values. You can also input values like 1e6 for 1,000,000.

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Added Apr 15, 2026

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