Terajoules to kilocalories conversion calculator above calculates how many kilocalories are in 'X' terajoules (where 'X' is the number of terajoules to convert to kilocalories). In order to convert a value from terajoules to kilocalories (from TJ to kcal) simply type the number of TJ to be converted to kcal and then click on the 'convert' button.