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The basic unit for measuring energy is the scientist’s calorie.

This is the amount of energy needed to raise the temperature of one cubic centimetre of water by 1 degree centigrade (⁰C). When talking about food and human energy, the measurement most commonly used is the kilocalorie – 1000 times greater – often written as kcal or calorie. Kilojoule (kJ) is the international unit of energy.

Approximately 4200 joules or 4.2 kilojoules is equal to one kilocalorie.

Understanding calories | NHS Choices
Calories | Wikipedia

Science Behind Calories and Nutrition Facts Labels | BytesizeScience | 12 Dec 2012 | 6m 11s
What 2000 calories looks like | BuzzFeed | 25 Mar 2013 | 1m 51s

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