Convert kilocalories to kilojoules
Enter a value in kilocalories (kcal) to get kilojoules (kJ). One kilocalorie is 4.184 kilojoules; one kilojoule is 0.239006 kilocalories.
How to use the Kilocalorie to kilojoule
- Type the number of kilocalories.
- Click Convert.
- Read the result in kilojoules, plus the same value in every other energy unit.
kcal to kJ formula
kilojoules = kilocalories × 4.184. To go the other way, kilocalories = kilojoules × 0.239006 (see kilojoules to kilocalories).
Worked example
12 kcal × 4.184 = 50.208 kJ.
Kilocalories to kilojoules conversion table
| Kilocalories | Kilojoules |
|---|---|
| 0.1 kcal | 0.4184 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
About the kilocalorie
The food Calorie: 1,000 small calories, 4,184 J. Nutrition labels worldwide.
About the kilojoule
Food energy on labels in Australia, New Zealand and Europe (alongside kcal).
Related conversions
kilojoules to kilocalories · kilocalories to calories · any unit.
Frequently asked questions
How many kilojoules in a kilocalorie?
4.184 kilojoules.
How many kilocalories in a kilojoule?
0.239006 kilocalories.
Is the factor exact?
The factor 4.184 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.