1 calorie = 4.184 joules
Convert calories to joules.
Both directions on one page — swap the units and the whole thing runs backwards.
Type a value, or “5cm to in”
1 row could not be read rows could not be read
The formula
J = cal × 4.184
Worked through with a real value: 10 calories = 41.84 joules.
Going the other way: cal = J × 0.239006, so 1 joule = 0.239006 calories.
What each unit is
- calorie cal
- The thermochemical calorie, defined as 4.184 joules. This is the scientific calorie; the 'Calorie' on food labels is a kilocalorie (1,000 of these).
- joule J
- The SI unit of energy, equal to the work done by a force of one newton acting over a distance of one metre.
Conversion tables
| calories (cal) | joules (J) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 6 | 25.104 |
| 7 | 29.288 |
| 8 | 33.472 |
| 9 | 37.656 |
| 10 | 41.84 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| joules (J) | calories (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 |
| 20 | 4.78011 |
| 25 | 5.97514 |
| 50 | 11.9503 |
| 75 | 17.9254 |
| 100 | 23.9006 |
Questions
How many joules are in a calorie?
1 calorie = 4.184 joules.
How do I convert calories to joules?
Use J = cal × 4.184. For example, 10 calories = 41.84 joules.
How many calories are in one joule?
1 joule = 0.239006 calories.
What is 10 calories in joules?
10 calories = 41.84 joules.
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