Convert joules to calories
Enter a value in joules (J) to get calories (cal). One joule is 0.239006 calories; one calorie is 4.184 joules.
How to use the Joule to calorie
- Type the number of joules.
- Click Convert.
- Read the result in calories, plus the same value in every other energy unit.
J to cal formula
calories = joules × 0.239006. To go the other way, joules = calories × 4.184 (see calories to joules).
Worked example
12 J × 0.239006 = 2.8681 cal.
Joules to calories conversion table
| Joules | Calories |
|---|---|
| 0.1 J | 0.023901 cal |
| 0.5 J | 0.119503 cal |
| 1 J | 0.239006 cal |
| 2 J | 0.478011 cal |
| 3 J | 0.717017 cal |
| 5 J | 1.195 cal |
| 10 J | 2.3901 cal |
| 20 J | 4.7801 cal |
| 25 J | 5.9751 cal |
| 50 J | 11.9503 cal |
| 100 J | 23.9006 cal |
| 250 J | 59.7514 cal |
| 500 J | 119.5029 cal |
| 1,000 J | 239.0057 cal |
About the joule
The SI unit of energy: one newton-metre, or one watt for one second.
About the calorie
The small (gram) calorie, 4.184 J. Food "calories" are actually kilocalories.
Related conversions
Frequently asked questions
How many calories in a joule?
0.239006 calories.
How many joules in a calorie?
4.184 joules.
Is the factor exact?
The factor 0.239006 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.