1 calorie = 4.1868 Joules. When the term calorie is used to express amount of energy provided by food or expended during body activities,
the term kcalorie or large Calorie is actually meant. 1 joule is approximately equal to 0.238845896628 cal (
calorie) (small calories, lower case c) or 2.390 ×10
−4 kilocalorie, Calories (food energy, upper case C)