How to convert calories to kilojoules

Calories (or kilo-calories as they should be correctly called) are a non-metric unit of energy, while kilojoules (kJ) are units of energy used in the Metric System.

1 cal = 4.184 kJ (or approx. 4.2 kJ)

To calculate the kJ content of a diet or a food, you need to multiply the calories by 4.184.

For example:  a 1 300 cal diet = 1 300 x 4.184 = 5 439 kJ.

To calculate the calorie content of a diet or food, you need to divide the kilojoules by 4.184.

For example:  a 5 439 kJ diet = 5 439 ÷ 4.184 = 1 300 calories.

- (Birgit Ottermann, Health24, December 2010)

We live in a world where facts and fiction get blurred
In times of uncertainty you need journalism you can trust. For 14 free days, you can have access to a world of in-depth analyses, investigative journalism, top opinions and a range of features. Journalism strengthens democracy. Invest in the future today. Thereafter you will be billed R75 per month. You can cancel anytime and if you cancel within 14 days you won't be billed. 
Subscribe to News24
Voting Booth
Have you entered our Health of the Nation survey?
Please select an option Oops! Something went wrong, please try again later.
27% - 9950 votes
73% - 26296 votes