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The difference between kj and kcals is that 1 kcal is equals to 4.1858kj. The previous unit for food energy was kcal. It has been replaced by the SI unit, kj.
Wiki User
∙ 9y ago
Wiki User
∙ 13y ago1kcal = 4.2kJ
It just a matter of the Imperial System vs the Metric System.
Note that 1kcal = 1000cal and 4.2kJ = 4.2kJ = 4200J
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