How to Calculate a Kilojoule

A kilojoule is a measurement value used to measure the energy of both physical activity as well as your food. Originally, calories and kilojoules were used to measure heat energy in engines, today they are more commonly used to measure food energy used and consumed by the body. One kilojoule is equal to 0.238 kilocalories. The number of kilojoules required to maintain your existing bodyweight varies from person to person. According to the Australian Bureau of Statistics, the average daily energy intake for men with acceptable body weight is 11,780 kilojoules, and 7,790 kilojoules for women.

Things You'll Need

• calculator

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Instructions

• 1

  Find the number of calories per 100 grams of food you are eating as well as the size of the portion you are eating. This can be found on the nutritional information label of the food.

• 2

  Divide the number of calories per 100 grams by 100.

• 3

  Multiply the result by the portion size in grams.

• 4

  Divide the total obtained by 100. This will be the the total kilojoules present in the food.