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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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Enter a value to see the result
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

1️⃣

Enter Power Value

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

2️⃣

Select Units

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

3️⃣

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 N⋅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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