Horsepower (electric) to calories per hour conversion calculator shown above calculates how many calories per hour are in 'X' horsepower (electric) (where 'X' is the number of horsepower (electric) to convert to calories per hour). In order to convert a value from horsepower (electric) to calories per hour (from hp to cal/h) simply type the number of hp to be converted to cal/h and then click on the 'convert' button.