One Power, Many Units

Watts, kilowatts, horsepower, BTU/hour — different fields use different units for the same physical quantity. This power converter normalizes everything through the watt and converts between nine common units with exact factors.

Pick the Right Horse

Horsepower comes in three flavors because the original definition was an estimate of a horse's work rate. Car manufacturers now quote metric or mechanical horsepower depending on market, and electrical equipment uses yet another value — the conversion table keeps them straight.

Power vs. Energy

Remember the distinction when you see results: power is the rate (watts), energy is the total (watt-hours). The converter handles rates only — multiply by time to get energy, which is what your electricity bill actually charges.