Counting from a kJ label
A 1,000 kJ portion is about 239 calories for a calorie-counting app.
Use Kilojoules to Calories
Converts kilojoules to calories (kcal) in this tab, with nothing sent anywhere.
Runs entirely on your deviceThe conversion happens in this browser tab. Nothing you type is uploaded, logged or stored, which is worth knowing for anything you would not paste into a search box.
A 1,000 kJ serving contains about 239 dietary calories. Nutrition panels may quote energy per 100 g as well as per serving, so confirm which row you copied before using the number in a food diary.
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Browse all general convertersAbout Kilojoules to Calories
Kilojoules are the energy unit on Australian, New Zealand and EU food labels, but to compare against a diet, a recipe or an app that counts calories you convert to kcal. Converting kilojoules to calories turns a kJ label into the calorie figure most of the world still counts in. One kilojoule is about 0.239 calories. The everyday case is a shopper or dieter reading a kilojoule-first label and wanting the calorie number they are used to, or an app set to calories that needs kJ converting. The food calorie is really a kilocalorie - a thousand physics calories - which is why the numbers look large next to the kilojoule figure they came from. Diet plans, gym apps and imported food packaging all mix the two, so translating kilojoules to calories is a routine step for anyone tracking intake across regions. Roughly, dividing kilojoules by 4.2 gives the calorie count. For a food diary, match the serving size as well as the energy unit before entering the calorie result.
Using Kilojoules to Calories
- Type a number of kJ. You can paste a value with its unit; the tool reads the number.
- The exact factor is applied and the result is shown as kcal, updating live as you type.
- Copy the answer, or switch to the reverse converter to go from kcal back to kJ.
Where kilojoules to calories helps
Both directions
Need the opposite? The kcal-to-kJ converter is linked below and uses the exact inverse factor.
Food Calories use kilocalories
A food label's capital-C Calorie normally means a kilocalorie. Confirm that convention when copying a value into a log: a small physics calorie is a different unit. This conversion changes energy units only; it does not assess portion size or dietary suitability.
Before you use the result
- The result is rounded for readability; the underlying factor is exact, so a value converted and back may differ in the last decimal place.
- Units in your input are ignored - only the number is read - so make sure the figure you type is really in kJ.
Questions about Kilojoules to Calories
How many calories in a kilojoule?
About 0.239 calories (kcal) per kilojoule. So 2,000 kJ is roughly 478 calories.
Is my data uploaded?
No. Kilojoules to Calories does the arithmetic in this browser tab; the value is calculated on your device and is not sent to a server.
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