Calories to kilojoules converter
Kilojoules (kJ)
1 calorie = 0.004184 kilojoules
How to convert calories to kilojoules
kJ = cal × 0.004184
Multiply the number of calories by 0.004184 to get kilojoules. Going the other way, divide by 0.004184 (or multiply by 239.005736138).
One calorie is exactly defined as 0.004184 kilojoules (to 12 significant figures), and one kilojoule is 239.005736138 calories.
Worked examples
- Convert 5 calories: 5 × 0.004184 = 0.02092 0.02092 kilojoules.
- Convert 12.5 calories: 12.5 × 0.004184 = 0.0523 0.0523 kilojoules.
- Convert 250 calories: 250 × 0.004184 = 1.046 1.046 kilojoules.
Quick-reference table
| cal | kJ |
|---|---|
| 1 | 0.004184 |
| 2 | 0.008368 |
| 3 | 0.012552 |
| 5 | 0.02092 |
| 10 | 0.04184 |
| 15 | 0.06276 |
| 20 | 0.08368 |
| 25 | 0.1046 |
| 50 | 0.2092 |
| 75 | 0.3138 |
| 100 | 0.4184 |
| 1,000 | 4.184 |
| kJ | cal |
|---|---|
| 1 | 239.0057361 |
| 2 | 478.0114723 |
| 3 | 717.0172084 |
| 5 | 1,195.028681 |
| 10 | 2,390.057361 |
| 15 | 3,585.086042 |
| 20 | 4,780.114723 |
| 25 | 5,975.143403 |
| 50 | 11,950.28681 |
| 75 | 17,925.43021 |
| 100 | 23,900.57361 |
| 1,000 | 239,005.7361 |
Related conversions
Frequently asked questions
How many kilojoules are in 1 calorie?
1 calorie equals 0.004184 kilojoules.
What is the formula to convert calories to kilojoules?
Use kJ = cal × 0.004184. Multiply the number of calories by 0.004184 to get kilojoules. Going the other way, divide by 0.004184 (or multiply by 239.005736138).
What is 100 calories in kilojoules?
100 calories is 0.4184 kilojoules.