Joules to Calories Converter
Convert joules to calories instantly. 1 J = 0.239006 cal. Free two-way converter with the formula and a quick reference table.
How to convert joules to calories
calories = joules × 0.239006
One joule equals 0.239006 calories, so to convert joules to calories you multiply by 0.239006. Going the other way, one calorie is 4.184 joules. Both units measure energy, so the conversion is an exact ratio that never changes.
10 joules = 2.3901 calories. Multiply your joule figure by the factor above (or just type it into the box) to convert any amount.
joules to calories table
| joules (J) | calories (cal) |
|---|---|
| 1 | 0.239006 |
| 2 | 0.478011 |
| 3 | 0.717017 |
| 5 | 1.195 |
| 10 | 2.3901 |
| 20 | 4.7801 |
| 25 | 5.9751 |
| 50 | 11.9503 |
| 100 | 23.9006 |
| 250 | 59.7514 |
| 500 | 119.5 |
| 1,000 | 239.01 |
Frequently asked questions
How many calories are in a joule?
One joule equals 0.239006 calories. So to convert, multiply the number of joules by 0.239006.
How do I convert joules to calories?
Multiply by 0.239006, or simply enter the value in the converter above — it does the math instantly and works both ways.
Is this conversion exact?
Yes — both units measure the same quantity, so the ratio is fixed and this uses the standard internationally-agreed factor.