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