Convert Calorie (thermochemical) to Kilojoule

One cal equals 0.004184 kJ. This converter allows you to easily convert between Calorie (thermochemical) and Kilojoule in real time.

Formula

cal × 0.004184 = kJ

Example: 1 cal = 0.004184 kJ

What is Calorie (thermochemical)?

The thermochemical calorie is a unit of energy originally defined as the amount needed to raise the temperature of one gram of water by one degree Celsius. It is exactly 4.184 joules. Note that the "Calorie" seen on food labels is actually a kilocalorie (1,000 calories). The calorie has deep roots in calorimetry and chemistry, and although the SI system favors joules, calories remain widely used in everyday discussions of food and diet.

What is Kilojoule?

The kilojoule equals 1,000 joules and is used for food energy labeling in Australia, New Zealand, and many other countries. A typical adult requires about 8,400 kJ (2,000 kcal) of food energy per day. In chemistry, enthalpy changes are commonly expressed in kJ per mole, and the heat of vaporization of water is approximately 2,257 kJ per kilogram.