Convert joules to calories instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert joules to calories
Multiply the value by 0.2390057361.
cal = J × 0.2390057361Example: 10 J = 2.3901 cal.
Joules to Calories conversion table
| Joules (J) | Calories (cal) |
|---|---|
| 1 J | 0.239 cal |
| 2 J | 0.478 cal |
| 3 J | 0.717 cal |
| 4 J | 0.956 cal |
| 5 J | 1.195 cal |
| 10 J | 2.3901 cal |
| 15 J | 3.5851 cal |
| 20 J | 4.7801 cal |
| 25 J | 5.9751 cal |
| 50 J | 11.9503 cal |
| 100 J | 23.9006 cal |
Frequently asked questions
How many calories is 1 joule?
1 joule equals 0.239 calories.
What is the formula to convert J to cal?
To convert J to cal, multiply the value by 0.2390057361. The full formula is: cal = J × 0.2390057361.
How do I convert calories back to joules?
Use the same calculator above and type your value into the calories field instead — it converts in both directions. Or use the reverse formula: J = cal ÷ 0.2390057361.
Is the J to cal conversion exact?
The conversion factor used here (0.2390057361) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.