How to convert calories to joules
J = cal × 4.184
Example: 5 cal × 4.184 = 20.92 J
Calories to Joules table
| Calories (cal) | Joules (J) |
|---|---|
| 0.5 cal | 2.092 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 |
| 6 cal | 25.104 J |
| 7 cal | 29.288 J |
| 8 cal | 33.472 J |
| 9 cal | 37.656 J |
| 10 cal | 41.84 J |
| 15 cal | 62.76 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 30 cal | 125.52 J |
| 40 cal | 167.36 J |
| 50 cal | 209.2 J |
| 75 cal | 313.8 J |
| 100 cal | 418.4 J |
| 250 cal | 1,046 J |
| 500 cal | 2,092 J |
| 1,000 cal | 4,184 J |
About these units
Calories (cal): The thermochemical calorie is exactly 4.184 joules. 1,000 of these make one food Calorie (kcal).
Joules (J): The joule is the SI unit of energy: the work done by a force of one newton over one metre.
Frequently asked questions
How many joules are in 1 calorie?
1 calorie equals 4.184 joules.
How do I convert cal to J?
Multiply the value in calories by 4.184. For example, 5 cal × 4.184 = 20.92 J.
How do I convert joules back to calories?
Multiply by 0.2390057361 (or divide by 4.184). 1 J = 0.2390057361 cal.
What is a calorie?
The thermochemical calorie is exactly 4.184 joules. 1,000 of these make one food Calorie (kcal).
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every energy unit at once? Use the Energy Converter.