Convert Calorie to Joule
Convert Calorie to Joule instantly. 1 cal = 4.184 J. Formula, worked examples and a quick reference table.
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One calorie equals 4.184 joules. To convert any number of calories to joules, multiply by 4.184.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Calorie to Joule formula
joule = calorie × 4.184
To go the other way, use calorie = joule ÷ 4.184.
Calorie to Joule conversion table
| Calorie | Joule |
|---|---|
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 3 cal | 12.552 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 250 cal | 1,046 J |
| 500 cal | 2,092 J |
| 1,000 cal | 4,184 J |
Frequently asked questions
How many joules are in a calorie? +
There are 4.184 joules in one calorie.
What is 10 cal in J? +
10 cal equals 41.84 J. Multiply 10 by 4.184.
How do I convert joule back to calorie? +
Use calorie = joule ÷ 4.184. The converter above handles both directions, or see our dedicated Joule to Calorie page.