A Calorie with a capital C, is also known as a kilocalorie, or kcal. Nutritional Facts labels in the United States use the "Calorie" label, while in most other parts of the world they are labelled as "kcal". In many other countries an alternate measure of energy, the kilojoule or kJ, is also listed on the label. 1 kcal = 4.1868 kJ