The following phase converter wizard has been used by American Rotary Engineers to successfully size tens of thousands of phase converters. For additional sizing assistance call 1-888-743-6832. *If your power rating is different than horsepower (HP), use the below calculations (or see video below) to find the proper HP rating to input into the Phase Converter Description hp Running kW Single-phase Single-phase kW Amps at 120 V 4.9 amps at 240 V LR amps at 240 V LR amps at 120 V Refrigerator pump, sump, furnace, garage opener 0.5 0.5 4.9 2.5 13 25 1.5 Freezer, washer, septic grinder 0.75 0.75 7.4 3.7 19 38 2.3 General 1 hp Formula to convert metric horsepower to kilowatts kilowatts hp (M) 0.735499. Since one metric horsepower is equal to 0.735499 kilowatts, the formula to find kilowatts is to multiply metric horsepower by 0.735499. For example, heres how to convert 5 metric horsepower to kilowatts using the formula. 5 hp (M) (5 0.735499) 3.677494 kW.