Kilojoules to kilocalories converter on this page calculates how many kilocalories are in 'X' kilojoules (where 'X' is the number of kilojoules to convert to kilocalories). In order to convert a value from kilojoules to kilocalories (from kJ to kcal) simply type the number of kJ to be converted to kcal and then click on the 'convert' button.