One joule is 0.239 calories.
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One calorie of heat is equivalent to one kilocalorie (kcal) in nutrition. This means that when we talk about calories in food, we are actually referring to kilocalories, where 1 kcal is equal to 1000 calories of heat energy.
1 joule is equal to 10^7 ergs.
1 erg is equal to 0.0000001 joules.
1 joule is equal to 10,000,000 erg.
A joule represents more energy than a calorie. 1 joule is equivalent to 0.239 calories.