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Questions And Answers - Diet And Weight Loss
Depending on what country you live in, you will find nutrition data listed in calories, kilojoules, or both. Our calculators give you the option of calculating in either calories (kcal) or kilojoules (kJ).
A calorie is a unit of measure of the energy required to raise the temperature of 1 gram of water by 1?C. A joule is a unit of electrical energy, commonly used in the physical sciences, equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second. Of course we don't use energy to raise the temperature of water or pass current through resistance, but similar processes maintain our body temperature and perform other bodily functions.
Because calories and joules are so small, when referring to food and energy expenditure it has become common practice to refer to them in multiples of 1,000. The term for 1,000 calories is kilocalories or kcal, and the term for 1,000 joules is kilojoules or kJ.
1 calorie = 4.184 joules
1 kilocalorie (kcal) = 4.184 kilojoules (kJ)
However, outside of scientific literature, it has also become common practice to refer to kilocalories as calories. Therefore when you read 500 calories on a food label it actually means 500 kilocalories, and the same holds true when you calculate an activity that burns 500 calories
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