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