Convert calories to joules
Enter a value in calories (cal) to get joules (J). One calorie is 4.184 joules; one joule is 0.239006 calories.
How to use the Calorie to joule
- Type the number of calories.
- Click Convert.
- Read the result in joules, plus the same value in every other energy unit.
cal to J formula
joules = calories × 4.184. To go the other way, calories = joules × 0.239006 (see joules to calories).
Worked example
12 cal × 4.184 = 50.208 J.
Calories to joules conversion table
| Calories | Joules |
|---|---|
| 0.1 cal | 0.4184 J |
| 0.5 cal | 2.092 J |
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 3 cal | 12.552 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 250 cal | 1,046 J |
| 500 cal | 2,092 J |
| 1,000 cal | 4,184 J |
About the calorie
The small (gram) calorie, 4.184 J. Food "calories" are actually kilocalories.
About the joule
The SI unit of energy: one newton-metre, or one watt for one second.
Related conversions
Frequently asked questions
How many joules in a calorie?
4.184 joules.
How many calories in a joule?
0.239006 calories.
Is the factor exact?
The factor 4.184 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.