Joules to Calories formula
calories = joules × 0.239006
Multiply the number of joules by 0.239006 to get calories. To go the other way, multiply by 4.184 instead, or use the calories to joules converter.
Joules to Calories conversion table
Common joules to calories values, rounded for reading. The converter above keeps full precision.
| Joules | Calories |
|---|---|
| 1 J | 0.239006 cal |
| 2 J | 0.478011 cal |
| 3 J | 0.717017 cal |
| 4 J | 0.956023 cal |
| 5 J | 1.19503 cal |
| 10 J | 2.39006 cal |
| 15 J | 3.58509 cal |
| 20 J | 4.78011 cal |
| 25 J | 5.97514 cal |
| 50 J | 11.9503 cal |
| 75 J | 17.9254 cal |
| 100 J | 23.9006 cal |
| 250 J | 59.7514 cal |
| 500 J | 119.503 cal |
| 1,000 J | 239.006 cal |
Worked example
To convert 10 J to calories, multiply by 0.239006: the result is 2.39006 cal. A nutritional Calorie is a kilocalorie, equal to 4,184 joules. The smaller scientific calorie equals 4.184 joules.
Frequently asked questions
How many calories are in a joule?
One joule equals 0.239006 calories (1 J = 0.239006 cal).
What is 10 joules in calories?
10 J converts to 2.39006 cal. Enter any other value in the converter above to see it recalculated instantly.
How do I convert calories back to joules?
Reverse the calculation: one calorie equals 4.184 joules. You can also swap the units in the converter or open the calories to joules page.
Related energy conversions
Need a different pair? Open the full energy converter to choose any two units.