Convert kilojoules to calories (kcal) and calories to kJ instantly. 1 calorie = 4.184 kJ. Includes the formula and quick tables for common values.
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1 calorie (kcal) = 4.184 kilojoules (kJ), and 1 kJ = 0.239 calories. Food labels in Australia show energy in kilojoules, while diet advice and many apps use calories, so converting between them is useful.
Example: a snack with 1,000 kJ contains 1,000 ÷ 4.184 = about 239 calories. A drink with 150 calories contains 150 × 4.184 = about 628 kJ.
| Kilojoules | Calories (kcal) |
|---|---|
| 100 kJ | 24 kcal |
| 200 kJ | 48 kcal |
| 500 kJ | 120 kcal |
| 800 kJ | 191 kcal |
| 1,000 kJ | 239 kcal |
| 1,500 kJ | 359 kcal |
| 2,000 kJ | 478 kcal |
| 2,100 kJ | 502 kcal |
| 2,500 kJ | 598 kcal |
| 3,000 kJ | 717 kcal |
| 4,000 kJ | 956 kcal |
| 5,000 kJ | 1,195 kcal |
| 6,000 kJ | 1,434 kcal |
| 8,000 kJ | 1,912 kcal |
| 8,700 kJ | 2,079 kcal |
| 10,000 kJ | 2,390 kcal |
| Calories (kcal) | Kilojoules |
|---|---|
| 50 kcal | 209 kJ |
| 100 kcal | 418 kJ |
| 150 kcal | 628 kJ |
| 200 kcal | 837 kJ |
| 250 kcal | 1,046 kJ |
| 300 kcal | 1,255 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
| 1,500 kcal | 6,276 kJ |
| 2,000 kcal | 8,368 kJ |
| 2,500 kcal | 10,460 kJ |
Australian labels list energy in kilojoules, usually per serve and per 100 g, and some also show calories. Compare products using the per 100 g column. Read more in our guide to kilojoules vs calories on Australian food labels.
Get a personal daily calorie estimate from your age, size and activity.
Open the Calorie CalculatorHow many kJ are in a calorie?
One calorie (kilocalorie, kcal) is 4.184 kilojoules. A common rounded figure is 4.2 kJ.
How do I convert kJ to calories?
Divide the kilojoules by 4.184. For example, 1,000 kJ ÷ 4.184 = about 239 calories.
How do I convert calories to kJ?
Multiply the calories by 4.184. For example, 100 calories × 4.184 = about 418 kJ.
Is a calorie on a food label the same as a kilocalorie?
Yes. The "calories" on food labels and in diet advice are kilocalories (kcal), which equal 1,000 small calories.
How many calories is 8,700 kJ?
About 2,079 calories. 8,700 kJ is the average adult daily energy figure used as a reference on Australian food labels.