Convert Calories to Joules
1 calorie (small) = 4.184 joules. Multiply the number of calories by 4.184.
Calories to Joules table
| Calories | Joules |
|---|---|
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 3 cal | 12.552 J |
| 4 cal | 16.736 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 500 cal | 2,092 J |
| 1000 cal | 4,184 J |
Calories to Joules in your head
Multiply by 17, then divide by 4.
That lands within 2% of the exact value.
10 cal → 42.5 J in your head, 41.84 J exactly.
About these units
The calorie (small) (cal) is a specialist or regional unit of energy & work, equal to 4.184 joules.
The joule (J) is an SI base or derived unit of energy & work.
Going the other way, 1 joule = 0.23900574 calories. Diet calories, electricity bills in kilowatt-hours, boiler ratings in BTU and particle physics in electronvolts are all the same physical quantity. Convert energy across every scale from the atomic to the industrial.
Frequently asked
- How many joules are in a calorie (small)?
- 1 calorie (small) = 4.184 joules.
- How do you convert calories to joules?
- Multiply the number of calories by 4.184.
- What is 10 cal in J?
- 10 cal = 41.84 J.