ACCURATE CONVERSION
Calories to Joules Converter
Convert calories (cal) to joules (J) with a standards-based formula.
From
To
How to convert calories to joules
Enter a value in the converter above. The result updates immediately using the relationship below.
FORMULA1 calorie = 4.184 joules
Calories to Joules conversion table
| Calories (cal) | Joules (J) |
|---|---|
| 1 | 4.184 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
Common values
For a quick estimate, multiply by the factor above. Use more decimal places when technical work requires additional precision.
Frequently asked questions
How many joules are in one calorie?
One calorie equals 4.184 joules.
How do you convert calories to joules?
Multiply the calorie value by 4.184.
Can I convert joules back to calories?
Yes. One joule equals 0.23900574 calories; you can also use the swap button.