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