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