Convert calories to joules instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert calories to joules
Multiply the value by 4.184.
J = cal × 4.184Example: 10 cal = 41.84 J.
Calories to Joules conversion table
| Calories (cal) | Joules (J) |
|---|---|
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 3 cal | 12.552 J |
| 4 cal | 16.736 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 15 cal | 62.76 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
Frequently asked questions
How many joules is 1 calorie?
1 calorie equals 4.184 joules.
What is the formula to convert cal to J?
To convert cal to J, multiply the value by 4.184. The full formula is: J = cal × 4.184.
How do I convert joules back to calories?
Use the same calculator above and type your value into the joules field instead — it converts in both directions. Or use the reverse formula: cal = J ÷ 4.184.
Is the cal to J conversion exact?
The conversion factor used here (4.184) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.