Power Conversion Calculator
Convert between watts, kilowatts, horsepower and other power units
Professional power unit converter supporting electrical and mechanical power measurements. Convert between watts, kilowatts, horsepower, BTU/hr and more with instant accurate results and detailed formulas.
Power Input
Conversion Results
Enter Values to Convert
Your power conversion results will appear here
Quick Reference Table
| Unit | Symbol | Watts Equivalent | Common Use |
|---|---|---|---|
| Watt | W | 1 W | Small appliances, LED bulbs |
| Kilowatt | kW | 1,000 W | Home appliances, electric motors |
| Horsepower | HP | 745.7 W | Car engines, industrial motors |
| BTU per Hour | BTU/hr | 0.293 W | HVAC systems, heating |
When to Use Power Conversion Calculator
Electrical Engineering
Convert power ratings for electrical systems, motors, generators, and power supplies. Essential for circuit design and load calculations.
Automotive Industry
Convert engine power between horsepower and kilowatts for vehicle specifications, performance comparisons, and technical documentation.
HVAC Systems
Convert between BTU/hr and watts for heating and cooling system specifications, energy efficiency calculations, and equipment sizing.
Energy Auditing
Calculate power consumption for energy audits, efficiency assessments, and cost analysis of electrical equipment and appliances.
Industrial Applications
Convert power ratings for industrial machinery, pumps, compressors, and manufacturing equipment for specifications and maintenance.
Academic Research
Convert power units for physics calculations, engineering studies, research papers, and educational projects requiring precise measurements.
Frequently Asked Questions
What is the Power Conversion Calculator?
Our power conversion calculator is a comprehensive tool that converts between various power units including watts, kilowatts, horsepower, BTU/hr, and more. It provides instant accurate conversions with detailed formulas and explanations for electrical and mechanical power measurements.
How accurate are the power conversions?
The calculator uses precise conversion factors and formulas based on international standards (SI units, NIST guidelines). All conversions are accurate to multiple decimal places and follow established engineering conventions. Results are calculated using double-precision arithmetic for maximum accuracy.
What power units are supported?
The calculator supports watts (W), kilowatts (kW), megawatts (MW), gigawatts (GW), horsepower (HP), metric horsepower (PS), BTU per hour, calories per second, foot-pounds per second, ergs per second, joules per second, and kilogram-force meters per second.
Is this power converter free to use?
Yes, our power conversion calculator is completely free to use with no registration required. You can perform unlimited conversions, access all features, download results, and use the tool for personal or commercial purposes without any cost or restrictions.
Can I convert horsepower to watts?
Yes, the calculator easily converts horsepower to watts and vice versa. It supports both mechanical horsepower (745.7 watts) and metric horsepower (735.5 watts) with clear distinctions. The tool automatically applies the correct conversion factor based on your selection.
What is the difference between watts and kilowatts?
A kilowatt equals 1,000 watts. Watts measure smaller power amounts (like light bulbs, small appliances), while kilowatts measure larger power consumption (like household appliances, electric motors, or industrial equipment). The relationship is: 1 kW = 1,000 W.
How do I convert BTU/hr to watts?
To convert BTU/hr to watts, multiply by 0.293071. For example, 1000 BTU/hr equals approximately 293.07 watts. Our calculator performs this conversion automatically with high precision using the exact conversion factor of 0.29307107017 watts per BTU/hr.
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