The difference between Calories and kilojoules is very much the same difference between metres and feet. They are just two different measures of the same thing, energy. It can be quite confusing though as often food is measured in kilojoules and exercise in Calories. This makes it tough to compare the two, but let's have a look at how it all works:
1 Calorie = 4.184 kilojoules
(note that Calorie is with a capital 'C' as this actually means 1000 calories, which is the way we are used to seeing it)
Often you will want to convert kilojoules into Calories (or vise versa) and so the easiest way is to just divide the kilojoules figure by 4 to get a rough figure. If you want to be exact you need to divide by 4.184.
So in an example 2343 kilojoules = 2343/4.184
= 600 Calories
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Awesome post. This creates a lot of clarity for me! Always been confused between the two