Power Converter

This free power converter converts power between watts, kilowatts, megawatts, gigawatts and milliwatts, mechanical, metric, electrical and boiler horsepower, BTU per hour / minute / second, kilocalories per hour, calories per second, foot-pounds per second, tons of refrigeration and the logarithmic units dBm and dBW. Handy for engines, appliances, HVAC, RF and electronics. Pick a source and target unit, type a value, and the result updates live — then copy it or read every other unit off the reference table.

Choose Auto precision for clean significant-figure output, or lock a fixed number of decimals. The logarithmic scales are handled correctly: dBm is referenced to one milliwatt (0 dBm = 1 mW, 30 dBm = 1 W) and dBW to one watt (0 dBW = 1 W), so RF power figures convert straight to watts and back. Note that VA and kVA are apparent power and are treated as equal to watts here (unity power factor). Use the swap button to reverse the direction instantly.