How to convert joules to calories
To convert joules to calories, multiply by 0.239005736138. Energy conversions connect nutrition, electricity bills, heating systems and physics.
Joule to Calorie conversion table
| Joule (J) | Calorie (cal) |
|---|---|
| 0.1 J | 0.0239005736138 cal |
| 0.5 J | 0.119502868069 cal |
| 1 J | 0.239005736138 cal |
| 2 J | 0.478011472275 cal |
| 3 J | 0.717017208413 cal |
| 4 J | 0.956022944551 cal |
| 5 J | 1.19502868069 cal |
| 10 J | 2.39005736138 cal |
| 20 J | 4.78011472275 cal |
| 25 J | 5.97514340344 cal |
| 50 J | 11.9502868069 cal |
| 100 J | 23.9005736138 cal |
| 500 J | 119.502868069 cal |
| 1,000 J | 239.005736138 cal |
About the units
Joule (J)
The joule is the SI unit of energy, the work done by one newton over one meter.
Calorie (cal)
A (small) thermochemical calorie is exactly 4.184 joules.
How to use this converter
- Type the number of joules (J) 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 joules.
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 joule?
One joule equals 0.239005736138 calories. 0.239005736138 is the exact factor used by this converter.
How do I convert joules to calories?
Multiply the value in joules by 0.239005736138. To go the other way, multiply calories by 4.184.
What is 10 J in cal?
10 J = 2.39005736138 cal. Also, 5 J = 1.19502868069 cal and 100 J = 23.9005736138 cal.
What is the difference between a joule and a calorie?
The joule is the SI unit of energy, the work done by one newton over one meter. A (small) thermochemical calorie is exactly 4.184 joules.
Is this tool free and private?
Yes — the Joule 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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