Power Converter
Convert between watts, horsepower, kilowatts and more.
How to use Power Converter
Select your source unit
Click the 'From' dropdown menu at the top left and choose your starting unit (Watts, Horsepower, Kilowatts, BTU/h, or Joules/second). The dropdown displays all available power measurement units with their abbreviations.
Enter your value
Type your numerical value into the input field labeled 'Enter amount'. The field accepts decimals and whole numbers. You can paste values directly or use the up/down arrow buttons to adjust incrementally.
Choose your target unit
Click the 'To' dropdown menu on the right side and select your desired output unit (Watts, Horsepower, Kilowatts, BTU/h, or Joules/second). The conversion calculates automatically.
Copy or reset your result
View the converted value displayed in the result box. Click the 'Copy' button to copy the result to your clipboard, or click 'Reset' to clear all fields and start a new conversion.
How to Use Power Converter Online — Free Guide (2026)
Power conversion is essential for engineers, electricians, students, and professionals working with electrical systems, motors, and machinery. Whether you're converting watts to horsepower, kilowatts to BTU per hour, or any other power measurement, Power Converter delivers instant, accurate results online—completely free.
What Is Power and Why Convert Units?
Power measures the rate of energy transfer, typically expressed in watts. However, different industries and applications use different units. Mechanical engineers use horsepower (HP), while electrical engineers use watts (W) and kilowatts (kW). HVAC specialists reference BTU per hour. Understanding these conversions prevents costly mistakes in equipment selection, electrical planning, and motor specifications.
Power Converter Units Explained
Watts (W) represent the standard SI unit for power. One watt equals one joule per second. Kilowatts (kW) equal 1,000 watts—commonly used for household and industrial electrical measurements. Horsepower (HP) originated from steam engine terminology, where 1 HP = 746 watts. BTU per hour (BTU/h) measures heating and cooling capacity in HVAC systems. Joules per second (J/s) is the scientific equivalent of watts.
How to Convert Power Units: Step-by-Step
Access Power Converter in your browser—no downloads, software, or registration needed. Click the 'From' dropdown and select your starting unit. For example, if converting 5 horsepower to watts, select 'Horsepower' from the dropdown. Type your value (5) into the input field. Click the 'To' dropdown and select 'Watts'. The converter automatically calculates 5 HP = 3,730 watts. Copy the result using the Copy button or reset to start a new conversion.
Common Power Conversion Examples
A 10 kilowatt solar system produces 10,000 watts continuously. Converting to horsepower: 10 kW = 13.41 HP. A 5 HP motor consumes 3,730 watts during operation. Converting to kilowatts: 3,730 W = 3.73 kW. An air conditioning unit rated at 12,000 BTU/h equals approximately 3.517 kilowatts or 4.71 horsepower.
Why Choose Power Converter?
Power Converter offers instant calculations without registration, subscription fees, or account creation. The tool processes all calculations locally in your browser—your data never leaves your device. Results display with precision to 10 decimal places for engineering accuracy. The mobile-friendly interface works identically on smartphones, tablets, and desktops. All conversions use standard scientific definitions ensuring consistency with industry standards.
Tips for Accurate Power Conversions
Always verify which unit represents input versus output. Double-check decimal placement when entering large values. Remember conversion factors: 1 HP = 746 W, 1 kW = 1,000 W. When converting between mechanical (HP) and electrical (watts) power, account for motor efficiency losses—actual mechanical output may be 5-15% lower than electrical input. For HVAC applications, confirm whether BTU/h measures heating or cooling capacity.
Real-World Applications
Electricians use power conversions when calculating electrical service requirements. A 50 HP motor installation requires 37,300 watts minimum service capacity. HVAC technicians convert BTU/h ratings to kilowatts for energy cost calculations. A 24,000 BTU/h air conditioner equals 7.03 kilowatts. Engineers designing solar installations convert kilowatts to horsepower equivalents for comparative analysis. Manufacturing facilities convert equipment specifications across unit systems for inventory and procurement.
Start Converting Power Units Today
Power Converter eliminates manual calculations, formula lookups, and calculation errors. Whether you need to convert watts to horsepower, kilowatts to BTU per hour, or any power measurement combination, access the free online tool instantly. No email required, no registration process, no time limitations. Convert power units accurately in seconds and bookmark Power Converter for future reference.