Joules to Calories Converter
Convert joules (J) to calories (cal) instantly. Type a value above and the result updates while you type. 1 joule equals 0.239006 calories.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 joule = 0.239006 calories
Multiply the joules value by 0.239006 to get calories. Or divide by 4.184 to go the other way.
Joules to calories conversion table
| J | cal |
|---|---|
| 1 | 0.239006 |
| 2 | 0.478011 |
| 3 | 0.717017 |
| 4 | 0.956023 |
| 5 | 1.19503 |
| 6 | 1.43403 |
| 7 | 1.67304 |
| 8 | 1.91205 |
| 9 | 2.15105 |
| 10 | 2.39006 |
| 15 | 3.58509 |
| 20 | 4.78011 |
| 25 | 5.97514 |
| 50 | 11.9503 |
| 75 | 17.9254 |
| 100 | 23.9006 |
Worked examples
- 5 J × 0.239006 = 1.19503 cal
- 30 J × 0.239006 = 7.17017 cal
- 165 J × 0.239006 = 39.4359 cal
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
Frequently asked questions
How many calories are in 1 joule?
1 joule equals 0.239006 calories (J → cal).
How do you convert joules to calories?
Multiply the number of joules by 0.239006. For example: 10 J × 0.239006 = 2.39006 cal.
What is 50 J in cal?
50 J equals 11.9503 cal.
Which is bigger: 1 joule or 1 calorie?
1 calorie is bigger: 1 joule is only 0.239006 calories.