How to convert kilojoules to calories
To convert kilojoules to calories, multiply by 239.005736138. Energy conversions connect nutrition, electricity bills, heating systems and physics.
Kilojoule to Calorie conversion table
| Kilojoule (kJ) | Calorie (cal) |
|---|---|
| 0.1 kJ | 23.9005736138 cal |
| 0.5 kJ | 119.502868069 cal |
| 1 kJ | 239.005736138 cal |
| 2 kJ | 478.011472275 cal |
| 3 kJ | 717.017208413 cal |
| 4 kJ | 956.022944551 cal |
| 5 kJ | 1,195.02868069 cal |
| 10 kJ | 2,390.05736138 cal |
| 20 kJ | 4,780.11472275 cal |
| 25 kJ | 5,975.14340344 cal |
| 50 kJ | 11,950.2868069 cal |
| 100 kJ | 23,900.5736138 cal |
| 500 kJ | 119,502.868069 cal |
| 1,000 kJ | 239,005.736138 cal |
About the units
Kilojoule (kJ)
A kilojoule is 1,000 joules and appears on food labels in many countries.
Calorie (cal)
A (small) thermochemical calorie is exactly 4.184 joules.
How to use this converter
- Type the number of kilojoules (kJ) in the input box.
- The result in calories appears instantly — no button needed.
- See the same value in every other energy unit just below.
- Use “Swap units” to convert calories back to kilojoules.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many calories are in one kilojoule?
One kilojoule equals 239.005736138 calories. 239.005736138 is the exact factor used by this converter.
How do I convert kilojoules to calories?
Multiply the value in kilojoules by 239.005736138. To go the other way, multiply calories by 0.004184.
What is 10 kJ in cal?
10 kJ = 2,390.05736138 cal. Also, 5 kJ = 1,195.02868069 cal and 100 kJ = 23,900.5736138 cal.
What is the difference between a kilojoule and a calorie?
A kilojoule is 1,000 joules and appears on food labels in many countries. A (small) thermochemical calorie is exactly 4.184 joules.
Is this tool free and private?
Yes — the Kilojoule to Calorie is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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