Kilojoule :

A kilojoule is equal to 1000 joules. It is a unit of measurement of energy. It expresses the energy that people get by consuming milk or food. In some countries, Nutritional food labels is expressed in kilojoules. One square metre of the Earth receives around 1.4 kilojoules of solar radiation during day light.
1 kJ = 0.2 Calories
1 Calorie = 4.2 kJs