What is a kJ?

kJ (kilojoules) is the Australian measure of how much energy people get from consuming a food or drink. Energy in food and drinks is measured by the number of kJ (kilojoules) it provides.

kJ are similar to Calories:

  • 1 kJ = 0.2 Calories (Cals)
  • 1 Calorie = 4.2 kJs

Calories and kJ converter

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Calories (Cal)


Kilojoules (kJ)

We need energy for our bodies and physical activity.

Knowing the number of kJ in the food we eat can help us ensure you get the right amount of energy for your needs.

People may remember that food energy used to be measured in Calories. Some countries still use those units.