Convert calories to joules
Calorie (cal) to joule (J). One calorie equals 4.184 joules.
Formula
Calorie to joule conversion table
| Calories | Joules | Joules | Calories |
|---|---|---|---|
| 1 cal | 4.184 J | 1 J | 0.239006 cal |
| 2 cal | 8.368 J | 2 J | 0.478011 cal |
| 3 cal | 12.552 J | 3 J | 0.717017 cal |
| 5 cal | 20.92 J | 5 J | 1.195 cal |
| 10 cal | 41.84 J | 10 J | 2.3901 cal |
| 20 cal | 83.68 J | 20 J | 4.7801 cal |
| 50 cal | 209.2 J | 50 J | 11.9503 cal |
| 100 cal | 418.4 J | 100 J | 23.9006 cal |
| 500 cal | 2092 J | 500 J | 119.5 cal |
| 1000 cal | 4184 J | 1000 J | 239.01 cal |
To convert calories to joules, multiply the number of calories by 4.184. One calorie equals 4.184 joules, and one joule equals 0.239006 calories, so the relationship is fixed and exact. As a worked example, 10 cal comes to 41.84 J. 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 calorie values already worked out in joules, plus the reverse joule to calorie direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many joules are in a calorie?
One calorie equals 4.184 joules. The ratio is constant, so you can multiply any number of calories by 4.184 to get joules.
What is the formula to convert calories to joules?
Use joules = calories × 4.184. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert joules back to calories?
Go the other way by using one joule equals 0.239006 calories. You can also press the swap button in the converter above to flip the direction in one click.
Is this calorie to joule 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.