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.
Where these come from
- 1 calorie = 4.184 joules
Every other number on this page is computed from those, and each category is pinned to conversions worked out by hand from the units' primary definitions before it ships.
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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