Kilojoules to Calories Conversion

To use the kilojoules to Calories calculator, simply enter the energy value in kilojoules in the input field provided and click the “Convert” button to see the equivalent energy in large/food calories. If you need to clear the values and start over, click the “Reset” button.

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Calories to kJ conversion ►

The kilogram calorie or ‘‘large calorie’’ is an obsolete term used for the kilocalorie, which is the calorie used to express the energy content of foods. However, in practice, the prefix ‘‘kilo’’ is usually omitted.

Kilojoules (kJ) are the metric unit, used commonly in many countries around the world, while calories (Cal) are used primarily in the United States.
NIST Special Publication 811: 2008 Edition

In the context of food and nutrition, “calories” (Cal) and “kilocalories” (kcal) are used interchangeably

How to Convert from Kilojoules to Calories

1 Cal = 1 kcal = 4.184 kJ

1 kJ ≈ 0.239006 Cal ≈ 0.239006 kcal

To convert kilojoules (kJ) to Calories (Cal), use the conversion factor where 1 kilojoule is approximately equal to 0.239006 Calories. The formula to convert kilojoules to Calories is:

Calories = kilojoules × 0.239006 or

E_(Cal) = E_(kcal = E_(kJ) * 0.239006.

Example

Convert 20 kilojoules to food calories.

E_(Cal) = 20 kJ * 0.239006 = 4.78012 Cal = 4.78012 kcal