Joules to Calories Converter (J to cal)
Type a value in joules to see it in calories instantly.
1 joule (J) = 0.239005736 calories (cal)
1 calorie (cal) = 4.184 joules (J)
How to convert joules to calories
Multiply the number of joules by 0.239005736, or divide by 4.184.
cal = J × 0.239005736 (or J ÷ 4.184)
Example: 1,000 J × 0.239005736 = 239.006 cal
This page uses the thermochemical calorie (4.184 J). The International Table calorie is 4.1868 J; the difference is about 0.07%.
J to cal conversion table
| Joules (J) | Calories (cal) |
|---|---|
| 1 J | 0.239006 cal |
| 4.184 J | 1 cal |
| 10 J | 2.39006 cal |
| 50 J | 11.9503 cal |
| 100 J | 23.9006 cal |
| 500 J | 119.503 cal |
| 1,000 J | 239.006 cal |
| 4,184 J | 1,000 cal |
| 5,000 J | 1,195.03 cal |
| 10,000 J | 2,390.06 cal |
| 100,000 J | 23,900.6 cal |
| 1,000,000 J | 239,006 cal |
About the units
Joule (J)
The joule is the SI unit of energy: the work done by a force of one newton over one meter (1 J = 1 kg·m²/s²).
Calorie (cal)
The thermochemical calorie is exactly 4.184 joules — roughly the energy needed to warm one gram of water by one degree Celsius.
Frequently asked questions
How many calories are in 1 joule?
1 joule equals 0.239005736 calories.
How do I convert joules to calories?
Multiply the number of joules by 0.239005736, or divide by 4.184. For example, 1,000 J × 0.239005736 = 239.006 cal.
How many joules are in 1 calorie?
1 calorie equals 4.184 joules.
How many joules are in a calorie?
One thermochemical calorie is exactly 4.184 joules.
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Background reading: SI Derived Units.