Slavakion, yeah it is a pain in the ass. Don't be worried if you're getting confused, it's a confusing system of naming they've developed.
1 calorie is the energy to raise 1 gram of water 1°C.
1 kilocalorie is 1000 calories, which means it's equivalent to the energy to raise 1 kg of water 1°C.
Food manufacturers are actually listing kilocalories on their food labels, not calories. But, by spelling it "Calorie" with a capital C, instead of calorie, they assume that's enough of a difference to be clear.
So basically it's the food industry that messed everything up when they started labelling things with capital letters and assuming that changed the definition.
*sigh*
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