How to use Joules to Calories
Type a value in Joules and the calories figure appears straight away. The conversion table further down lists common values.
The formula
cal = J ÷ 4.184
Examples
- 1 joules to calories
0.23900574 cal
- 10 joules to calories
2.39005736 cal
- 250 joules to calories
59.75143403 cal
Joules to Calories conversion table
| Joules | Calories |
|---|---|
| 1 | 0.239 cal |
| 2 | 0.478 cal |
| 3 | 0.717 cal |
| 4 | 0.956 cal |
| 5 | 1.195 cal |
| 6 | 1.434 cal |
| 7 | 1.673 cal |
| 8 | 1.912 cal |
| 9 | 2.1511 cal |
| 10 | 2.3901 cal |
| 15 | 3.5851 cal |
| 20 | 4.7801 cal |
| 25 | 5.9751 cal |
| 30 | 7.1702 cal |
| 40 | 9.5602 cal |
| 50 | 11.9503 cal |
| 75 | 17.9254 cal |
| 100 | 23.9006 cal |
| 250 | 59.7514 cal |
| 500 | 119.5029 cal |
| 1,000 | 239.0057 cal |
Limitations and assumptions
Uses the stated standard definitions. Small calories (cal). Food "Calories" are kilocalories (kcal), which are 1,000 cal.
Frequently asked questions
How many calories are in one joule?
One joule equals 0.23900574 cal. The formula is cal = J ÷ 4.184.
How do I convert joules to calories?
Use cal = J ÷ 4.184. For example, 10 joules gives 2.39005736 cal. Enter your own value above and the converter does the arithmetic for you.
How do I convert calories back to joules?
Invert the relationship: reverse the formula so you divide where this one multiplies (and subtract where it adds).
Is this conversion exact?
Energy and power units mix SI and traditional definitions, so check whether a "calorie" means a small calorie or a food Calorie (kilocalorie).