Kilojoules To Calories Converter

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On this page:
  • How to convert kilojoules to calories
  • How to convert calories to kilojoules
  • What are kJ?
  • Kilojoules to calories chart

How to convert kilojoules to calories

There are 4.184kJ in 1 food calorie (kcal). To roughly convert kilojoules to calories, divide your kJ figure by 4.2 or multiply it by 0.24. Note that when we talk about calories, we are actually describing food calories (kilocalories).

Calories (kcal) = kJ ÷ 4.184

As an example, let's say you're pouring yourself a glass of orange juice which supplies 400kJ of energy, and you want to convert it into calories. To do so, you divide it by 4.184, which gives you a figure of around 96 calories.

How to convert calories to kilojoules

As there are 4.184kJ in 1 food calorie (kcal), you can roughly convert calories to kilojoules by multiplying your calorie figure by 4.2.

kJ = calories (kcal) × 4.184

What are kilojoules?

With the introduction of the metric system in many countries, the kilojoule (kJ) replaced the food calorie (kcal) in measurements of food energy. This has created a need for converting between kilojoules and calories.

Kilojoules to calories chart

kJ to calorieskJ to calories
1 kJ = 0.239 calorie10 kJ = 2.39 calories
2 kJ = 0.478 calorie20 kJ = 4.78 calories
3 kJ = 0.717 calorie30 kJ = 7.17 calories
4 kJ = 0.956 calorie40 kJ = 9.56 calories
5 kJ = 1.195 calories50 kJ = 11.95 calories
6 kJ = 1.434 calories60 kJ = 14.34 calories
7 kJ = 1.673 calories70 kJ = 16.73 calories
8 kJ = 1.912 calories80 kJ = 19.12 calories
9 kJ = 2.151 calories90 kJ = 21.511 calories
10 kJ = 2.39 calories100 kJ = 23.901 calories

Note that conversions in the above chart are rounded to a maximum of 3 decimal places.

How many calories are in 500kJ?

500kJ is equal to 119.5 calories. You can calculate this by dividing 500 by 4.184, as there are 4.184kJ in 1 food calorie.

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