Calories to kilojoules
1 calorie = 4.18 kilojoules
For any other value: kJ = kcal × 4.184
Calculator
4.18 kJ
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Calories to kilojoules chart
The values people look up most.
| calories | kilojoules |
|---|---|
| 1 kcal | 4.18 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.
Where this number comes from
This factor is exact, not rounded. The thermochemical calorie is exactly 4.184 J.
Source: NIST Guide to the SI, Appendix B: Conversion Factors, NIST (National Institute of Standards and Technology, USA).
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