Convert Kilojoules to Calories (or Vice Versa)

Energy in food can be measured in calories or kilojoules.  If you have a preference for one over the other use this tool to translate calories into kilojoules, or vice versa. 

We need to eat enough food to provide energy for our bodies to function, but when we consume more energy (in kilojoules or calories) than we use, that’s when we can gain weight.  

Knowing the energy value of foods we consume can help us estimate how much we’re taking in. 

If you have a preference for noting the energy value in kilojoules (kJ) over calories (cal), or vice versa, use this tool to translate from one to the other.

Enter the value in calories to calculate in kilojoules, or enter a value in kilojoules to convert to calories.


One ‘uppercase C’ Calorie is actually a kilocalorie (1000 ‘lower case c’ calories) and equals 4 kilojoules (rounded to the nearest whole number).

This tool has been reviewed by Bupa health professionals and is based on reputable sources of scientific evidence. It is not diagnostic and should not be relied on as a substitute for professional medical or other health professional advice. Consult your doctor if you have questions.

Up next: How to tell the difference between calories (cal) and kilojoules (kJ)

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