Calories to kilojoules
1 calorie = 4.2 kilojoules
For any other value: kJ = kcal × 4.184
Calculator
4.2 kJ
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You can leave the unit in: 100 kcal is fine.
Calories to kilojoules chart
The values people look up most.
| calories | kilojoules |
|---|---|
| 1 kcal | 4.2 kJ |
| 500 kcal | 2092 kJ |
| 1500 kcal | 6276 kJ |
| 2000 kcal | 8368 kJ |
| 100 kcal | 418.4 kJ |
| 1000 kcal | 4184 kJ |
| 6000 kcal | 25104 kJ |
| 700 kcal | 2928.8 kJ |
| 150 kcal | 627.6 kJ |
| 200 kcal | 836.8 kJ |
| 250 kcal | 1046 kJ |
| 300 kcal | 1255.2 kJ |
| 1200 kcal | 5020.8 kJ |
| 1800 kcal | 7531.2 kJ |
| 2500 kcal | 10460 kJ |
| 400 kcal | 1673.6 kJ |
| 800 kcal | 3347.2 kJ |
Formula
kJ = kcal × 4.184
Food labels say “calories” but mean kilocalories. One of those is 4.184 kJ.