How many kilojoules are in one Calorie?

The conversion between Calories and kilojoules is a fundamental aspect of understanding energy in chemistry and nutrition. One Calorie, specifically a calorie defined in dietary terms, is equivalent to approximately 4.184 kilojoules. This relationship arises from the definition of the calorie as the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius, and the kilojoule being a larger unit of energy in the International System of Units (SI).

Thus, when converting dietary Calories to kilojoules using this established conversion factor, one finds that each Calorie corresponds to about 4.184 kilojoules. This is important for understanding energy content in foods and comparing energy values in different units.