Convert joules to calories
Joule (J) to calorie (cal). One joule equals 0.239006 calories.
Formula
Joule to calorie conversion table
| Joules | Calories | Calories | Joules |
|---|---|---|---|
| 1 J | 0.239006 cal | 1 cal | 4.184 J |
| 2 J | 0.478011 cal | 2 cal | 8.368 J |
| 3 J | 0.717017 cal | 3 cal | 12.552 J |
| 5 J | 1.195 cal | 5 cal | 20.92 J |
| 10 J | 2.3901 cal | 10 cal | 41.84 J |
| 20 J | 4.7801 cal | 20 cal | 83.68 J |
| 50 J | 11.9503 cal | 50 cal | 209.2 J |
| 100 J | 23.9006 cal | 100 cal | 418.4 J |
| 500 J | 119.5 cal | 500 cal | 2092 J |
| 1000 J | 239.01 cal | 1000 cal | 4184 J |
To convert joules to calories, divide the number of joules by 4.184. One joule equals 0.239006 calories, and one calorie equals 4.184 joules, so the relationship is fixed and exact. As a worked example, 10 J comes to 2.3901 cal. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a energy conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common joule values already worked out in calories, plus the reverse calorie to joule direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many calories are in a joule?
One joule equals 0.239006 calories. The ratio is constant, so you can multiply any number of joules by 0.239006 to get calories.
What is the formula to convert joules to calories?
Use calories = joules ÷ 4.184. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert calories back to joules?
Go the other way by using one calorie equals 4.184 joules. You can also press the swap button in the converter above to flip the direction in one click.
Is this joule to calorie converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.