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Power & Energy Conversion

Power Unit Converter

Convert watts, kilowatts, megawatts, horsepower, BTU per hour and other power units instantly. Built for electrical, mechanical, HVAC and engineering conversions.

Instant Results
15 Power Units
Accurate Factors
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Power Conversion Visual
Live Converter
Electrical power conversion illustration Illustration showing electrical power, watts, kilowatts and horsepower. POWER W OUTPUT kW METRIC W • kW • MW MECHANICAL hp THERMAL BTU/h
W SI Power Unit
kW 1,000 Watts
hp Mechanical Power

Convert Power Units Instantly

Enter a power value, select the original unit and choose the unit you want to convert it to.

Power Unit Converter Fast multi-unit power conversion
Ready
FROM
TO
Conversion Result
0.001 kW
1 W = 0.001 kW
Quick values

Popular Power Conversions

Load frequently used electrical, automotive and HVAC power conversion pairs with one click.

Watts to Kilowatts 1,000 W = 1 kW
Kilowatts to Watts 1 kW = 1,000 W
Horsepower to Kilowatts 1 hp ≈ 0.7457 kW
Kilowatts to Horsepower 1 kW ≈ 1.34102 hp
BTU/h to Watts 1 BTU/h ≈ 0.293071 W
Refrigeration Ton to kW 1 TR ≈ 3.51685 kW

Why Use Our Power Unit Converter?

A simple professional converter for students, technicians, engineers, HVAC professionals and everyday power calculations.

Instant Results

Your converted power value updates immediately without submitting a form or refreshing the page.

Accurate Conversion

Standard conversion factors are used for metric, mechanical and thermal power units.

Multiple Units

Convert watts, kilowatts, horsepower, BTU/h, refrigeration tons and many additional units.

Private & Free

Calculations run inside your browser. No signup, account or personal information is required.

What Is Power?

Power measures how quickly work is performed or energy is transferred. The standard SI unit of power is the watt, represented by the symbol W.

One watt is equal to one joule of energy transferred per second. Larger systems are commonly described using kilowatts, megawatts or gigawatts.

Why are there different power units?

Different industries developed different units. Electrical equipment commonly uses watts and kilowatts, vehicle engines often use horsepower, while heating and cooling applications may use BTU per hour or tons of refrigeration.

Power vs Energy

Power and energy are related but are not the same. Power describes the rate at which energy is used or transferred, while energy describes the total amount transferred or consumed.

POWER RELATIONSHIPS
P = E ÷ t
Power equals energy transferred divided by time.
P Power
E Energy
t Time
Electrical Power P = V × I
1 Watt 1 Joule / second

Common Power Units

Reference values for common power units expressed in watts.

Power Unit Symbol Equivalent in Watts
Watt W 1 W
Kilowatt kW 1,000 W
Megawatt MW 1,000,000 W
Gigawatt GW 1,000,000,000 W
Mechanical Horsepower hp 745.699872 W
Metric Horsepower PS 735.49875 W
BTU per Hour BTU/h 0.293071 W
Kilocalorie per Hour kcal/h 1.163 W
Ton of Refrigeration TR 3,516.852842 W
Foot-pound per Second ft·lb/s 1.355818 W

Where Are Power Conversions Used?

Power measurements appear across electrical systems, engines, HVAC equipment, appliances and industrial machinery.

Electrical Systems

Convert watts, kilowatts and megawatts when comparing appliances, generators and electrical equipment.

Automotive Power

Convert engine output between horsepower, metric horsepower and kilowatts for vehicle specifications.

HVAC & Cooling

Compare BTU per hour, watts, kilowatts and refrigeration tons for heating and cooling equipment.

Solar Power

Convert solar panel, inverter and system power ratings between watts and kilowatts.

Industrial Equipment

Compare motor, pump and machine power ratings across different technical specifications.

Science & Education

Quickly convert power units while studying physics, engineering and energy-related calculations.

How to Use the Power Unit Converter

Convert any supported power measurement in three simple steps.

1

Enter a Power Value

Type the numerical power measurement you want to convert into the input box.

2

Choose Power Units

Select your original unit and then select the power unit you want as the result.

3

Get Instant Result

The converted value and unit conversion ratio appear immediately on the page.

Power Unit Converter FAQs

Common questions about watts, kilowatts, horsepower and other power units.

The SI unit of power is the watt, represented by W. One watt is equal to one joule of energy transferred or used per second.
One kilowatt is equal to exactly 1,000 watts. Therefore, 5 kW equals 5,000 W.
One mechanical horsepower is approximately equal to 0.7457 kilowatts, or about 745.7 watts.
One kilowatt is approximately equal to 1.341 mechanical horsepower.
Yes. Select BTU per hour as the source unit and watts as the target unit. One BTU per hour is approximately equal to 0.293071 watts.
A watt is a unit of power, not energy. Power describes the rate at which energy is transferred or consumed. Energy itself may be measured in joules or watt-hours.
One ton of refrigeration represents a cooling rate of approximately 3.51685 kilowatts.
Yes. This Power Unit Converter is free to use and performs the conversion directly inside your browser without requiring registration.