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