Kilojoules to megacalories conversion calculator above calculates how many megacalories are in 'X' kilojoules (where 'X' is the number of kilojoules to convert to megacalories). In order to convert a value from kilojoules to megacalories (from kJ to Mcal) type the number of kJ to be converted to Mcal and then click on the 'convert' button.