Megawatt hours to horsepower-hour conversion calculator shown above calculates how many horsepower-hour are in 'X' megawatt hours (where 'X' is the number of megawatt hours to convert to horsepower-hour). In order to convert a value from megawatt hours to horsepower-hour (from MWh to hph) simply type the number of MWh to be converted to hph and then click on the 'convert' button.