Power Unit Converter: Watts, Kilowatts & Horsepower

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.