To calculate the KJ content of a diet or a food you need to multiply the calories by 4.184 for example a 1300 calories diet equals 1300 x 4.184 = 5439 KJ
To calculate the calories content of a diet or a food you need to divide that kJ by 4.184 for example KJ diet 5439 ÷ 4.184 = 1300 cal
hope this helps good luck :)
