power converter Power Converter Power Converter Enter a value, select units, and click Convert. Value From unit Watt (W) Kilowatt (kW) Megawatt (MW) Horsepower (mechanical) Horsepower (metric) BTU/hr To unit Watt (W) Kilowatt (kW) Megawatt (MW) Horsepower (mechanical) Horsepower (metric) BTU/hr Convert Result will appear here. Notes: 1 kW = 1000 W; 1 mechanical hp = 745.699872 W; 1 metric hp ≈ 735.49875 W; 1 W ≈ 3.412 BTU/hr.