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Frequently Asked Questions — kJ to kcal

Question: How do you convert kJ to kcal?

Answer: Divide the number of kilojoules by 4.184. For example, 100 kJ divided by 4.184 = 23.9 kcal.

Question: How many kcal is 100 kJ?

Answer: 100 kJ divided by 4.184 equals approximately 23.9 kcal. This is about the energy in a small snack.

Question: What is the difference between kJ and kcal?

Answer: Both measure energy. 1 kcal = 4.184 kJ exactly. Food nutrition labels in Australia, the UK, and the EU show both kJ and kcal.

Question: How many kJ is 2,000 kcal (a typical daily diet)?

Answer: 2,000 kcal x 4.184 = 8,368 kJ. Daily recommended energy intake is typically 8,000 to 10,000 kJ depending on age, sex, and activity level.

Question: Is kJ or kcal used for food energy?

Answer: Both are used. The US and many countries use kcal (labeled Calories on packaging). The UK, Australia, and EU label food in both kJ and kcal on packaging.