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Power Converter

CalculatorMathProductivityUtilities

Convert power units quickly and accurately between watts, kilowatts, horsepower, BTU/h and more with this comprehensive power converter tool. Perfect for engineers, students, and energy professionals.

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IN/OUT

Auto Process Client Side

Bulk Mode

Two-Unit
All Units

Formula

Change any value and the other will be calculated automatically

Watt (W)

Milliwatt (mW)

Kilowatt (kW)

Megawatt (MW)

Gigawatt (GW)

Horsepower (hp)

Metric Horsepower (hp(M))

Kilocalories per Hour (kcal/h)

British Thermal Units per Hour (BTU/h)

Foot-pounds per Second (ft·lbf/s)

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Guide

What is a Power Converter?

A power converter is a practical tool designed to convert power measurements between different units. Whether you’re working on engineering projects, studying physics, or managing energy systems, this tool helps you quickly translate power values across multiple standard units.

Key Features

Multiple Unit Conversions: Convert between watts (W), kilowatts (kW), megawatts (MW), gigawatts (GW), horsepower (hp), metric horsepower (hp(M)), kilocalories per hour (kcal/h), British Thermal Units per hour (BTU/h), and foot-pounds per second (ft·lbf/s).
Two-Unit Mode: Quick conversion between any two specific power units.
All Units Mode: See conversion results across all supported power units simultaneously.
Real-time Calculation: Values update automatically as you type.
Bulk Mode Option: Process multiple conversions at once for efficiency.
Formula Display: View the mathematical formula used for each conversion.

Common Power Unit Conversions

From	To	Conversion Factor
Watts (W)	Kilowatts (kW)	1 kW = 1,000 W
Watts (W)	Horsepower (hp)	1 hp = 745.7 W
Kilowatts (kW)	Horsepower (hp)	1 kW = 1.341 hp
Watts (W)	BTU/h	1 W = 3.412 BTU/h
Kilowatts (kW)	Kilocalories/hour (kcal/h)	1 kW = 859.85 kcal/h

Why Use This Tool?

Accuracy: Avoid calculation errors when converting between different power units.
Time-Saving: Get instant conversions without manual calculations.
Comprehensive: Access multiple power units in a single tool.
Educational: Learn the relationships between different power measurement systems.

How to Use

Select your conversion mode: “Two-Unit” for simple conversions or “All Units” for comprehensive results.
Enter the value you want to convert in any input field.
The tool automatically calculates and displays the equivalent values in other units.
Toggle “Bulk Mode” if you need to process multiple conversions.
View the formula used for the calculation at the bottom of the converter.

Applications in Different Fields

Engineering: Power ratings for motors, generators, and electrical systems
Physics: Energy transfer calculations and power analysis
Automotive: Engine power specifications and comparisons
HVAC: Heating and cooling system capacity calculations
Energy Management: Monitoring and analyzing power consumption

 FAQ

What is the difference between watts and horsepower?

Watts and horsepower are both units of power but come from different measurement systems. One horsepower equals approximately 745.7 watts. Watts (W) is the standard unit in the International System of Units (SI), while horsepower (hp) was developed to compare steam engines to horses and is still commonly used for engines and motors.
How do I convert kilowatts to BTU per hour?

To convert kilowatts (kW) to British Thermal Units per hour (BTU/h), multiply the kilowatt value by 3,412.14. For example, 1 kW = 3,412.14 BTU/h. This conversion is useful when comparing heating or cooling systems that use different measurement units.
Why do we use so many different power units?

Different power units evolved in various industries and regions. Watts and its derivatives (kW, MW) are used in electrical applications, horsepower in mechanical systems, BTU/h in heating and cooling, and kcal/h in some thermal applications. Each industry has historically preferred certain units, and regional differences also play a role in which units are commonly used.
Which power unit should I use for home appliances?

For home appliances, watts (W) or kilowatts (kW) are the most commonly used units. Most household electrical devices are rated in watts, with larger appliances like air conditioners or electric heaters often rated in kilowatts. These units directly relate to electrical consumption, making it easier to calculate energy usage and costs.
How accurate are power unit conversions?

Power unit conversions are mathematically precise when using standard conversion factors. The conversion between watts and horsepower is fixed at 1 hp = 745.7 W. However, in real-world applications, there may be slight variations due to rounding or specific regional definitions of certain units (such as slight differences between mechanical horsepower and metric horsepower).
Can I use this converter for electrical billing calculations?

The power converter tool converts between different power units, which is useful for understanding electrical ratings. However, for billing purposes, you would need to calculate energy (power × time), typically measured in kilowatt-hours (kWh). While this tool helps you understand power ratings, you'd need to factor in usage time to estimate electrical costs.