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Power Unit Converter: Watts, Kilowatts & Horsepower
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This power converter instantly switches between watts, kilowatts, megawatts, horsepower, and BTU per hour, the units most often used to describe engines, motors, appliances, and HVAC systems. It's useful for car buyers comparing engine horsepower to kilowatt ratings, homeowners checking appliance wattage, and engineering students working through power conversion problems. Enter a value into any field and every other power unit updates immediately, using precise standard conversion factors so there's no need to remember formulas or search for reference charts. The calculator is completely free, requires no account, and works identically on mobile and desktop browsers. Because every conversion runs locally in your browser, your inputs are never transmitted to or stored on a server, keeping the tool both fast and private. Scroll down to enter a power value and see it converted across every supported unit instantly.
Features
- Converts between watts, kilowatts, megawatts, horsepower, and BTU/h
- Instant live updates as you type
- Accurate for automotive, engineering, and appliance use
- Handles decimal precision for technical calculations
- Clean, simple interface with no clutter
- Works on any device with a browser
Why use this power unit converter?
- Instant conversion with no delay
- Fully private — all math happens in your browser
- Accurate, standardized power conversion factors
- Easy to use without prior technical knowledge
- Completely free with unlimited use
Frequently asked questions
How many watts are in one horsepower?
One mechanical horsepower equals approximately 745.7 watts.
How do I convert kilowatts to horsepower?
Multiply the kilowatt value by 1.34102 to get horsepower; this calculator performs that instantly.
What is BTU per hour used for?
BTU/h is commonly used to rate the heating or cooling capacity of air conditioners, furnaces, and boilers.
How many watts are in a kilowatt?
One kilowatt equals 1,000 watts.
Is this power converter useful for comparing car engine specs?
Yes, it's commonly used to convert between horsepower and kilowatt ratings when comparing vehicles from different markets.
How do I convert watts to BTU per hour?
Multiply the watt value by approximately 3.412 to get BTU/h; simply enter watts and the calculator does this automatically.