what's the difference between calories and kilojoules
4.184 kilojoules = 4,184 joules = 1 Calorie = 1 kilocalorie = 1,000 calories. Difference Between Calories and Kilojoules. - Calorie/kilocalorie is a larger unit to measure energy compared to kilojoule.- The unit Calorie is often used to indicate food energy, but the unit kilojoule uses for a wider variety of energy indications.ummary. It is important to know the energy conversions, because Calorie and kilojoules are interchangeably used in food packaging. By knowing this you can be aware of how much energy you are taking into the body from each food.