Calories per hour to kilocalories per hour conversion calculator above calculates how many kilocalories per hour are in 'X' calories per hour (where 'X' is the number of calories per hour to convert to kilocalories per hour). In order to convert a value from calories per hour to kilocalories per hour (from cal/h to kcal/h) just type the number of cal/h to be converted to kcal/h and then click on the 'convert' button.