Hp to Watts Conversion Table Horsepower Watts Rounded Watts 1 hp 745.699872 W 746 Watts 2 hp 1491.399744 W 1491 Watts 3 hp 2237.099616 W 2237 Watts 4 hp 2982.799488 W 2983 Watts Click to see full answer. In this manner, how many watts is a 1 hp motor?1 HP is approximately equal to 750 watts.Likewise, how many watts does it take to run a 3/4 HP motor? Wattage Estimate for Contractor Applications Approximate Starting Wattage Approximate Running Wattage 1/4 Horsepower 1050 400 1/3 Horsepower 1350 450 1/2 Horsepower 1800 600 3/4 Horsepower 2600 850 Similarly one may ask, how many watts is a 2hp motor? If a 2 horse power motor is doing 2 horsepower of work then in the load about 1500 Watts of energy is used in the load.How many watts does a 5 hp motor use? 3730 watts