Calories to joules converter
Joules (J)
1 calorie = 4.184 joules
How to convert calories to joules
J = cal × 4.184
Multiply the number of calories by 4.184 to get joules. Going the other way, divide by 4.184 (or multiply by 0.239005736138).
One calorie is exactly defined as 4.184 joules (to 12 significant figures), and one joule is 0.239005736138 calories.
Worked examples
- Convert 5 calories: 5 × 4.184 = 20.92 20.92 joules.
- Convert 12.5 calories: 12.5 × 4.184 = 52.3 52.3 joules.
- Convert 250 calories: 250 × 4.184 = 1,046 1,046 joules.
Quick-reference table
| cal | J |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 5 | 20.92 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| 1,000 | 4,184 |
| J | cal |
|---|---|
| 1 | 0.2390057361 |
| 2 | 0.4780114723 |
| 3 | 0.7170172084 |
| 5 | 1.195028681 |
| 10 | 2.390057361 |
| 15 | 3.585086042 |
| 20 | 4.780114723 |
| 25 | 5.975143403 |
| 50 | 11.95028681 |
| 75 | 17.92543021 |
| 100 | 23.90057361 |
| 1,000 | 239.0057361 |
Related conversions
Frequently asked questions
How many joules are in 1 calorie?
1 calorie equals 4.184 joules.
What is the formula to convert calories to joules?
Use J = cal × 4.184. Multiply the number of calories by 4.184 to get joules. Going the other way, divide by 4.184 (or multiply by 0.239005736138).
What is 100 calories in joules?
100 calories is 418.4 joules.