Calories to Joules formula
joules = calories × 4.184
Multiply the number of calories by 4.184 to get joules. To go the other way, multiply by 0.239006 instead, or use the joules to calories converter.
Calories to Joules conversion table
Common calories to joules values, rounded for reading. The converter above keeps full precision.
| Calories | Joules |
|---|---|
| 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 |
| 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 |
Worked example
To convert 10 cal to joules, multiply by 4.184: the result is 41.84 J. A nutritional Calorie is a kilocalorie, equal to 4,184 joules. The smaller scientific calorie equals 4.184 joules.
Frequently asked questions
How many joules are in a calorie?
One calorie equals 4.184 joules (1 cal = 4.184 J).
What is 10 calories in joules?
10 cal converts to 41.84 J. Enter any other value in the converter above to see it recalculated instantly.
How do I convert joules back to calories?
Reverse the calculation: one joule equals 0.239006 calories. You can also swap the units in the converter or open the joules to calories page.
Related energy conversions
Need a different pair? Open the full energy converter to choose any two units.