How to convert kilocalories to kilojoules
- Type the value in kilocalories (kcal) in the box above.
- The result in kilojoules appears instantly, along with the same value in every other unit of energy.
- Press ⇄ to convert the other way.
Formula
kJ = kcal × 4.184. So 1 kcal = 4.184 kJ, and 100 kcal = 418.4 kJ.
Kilocalories to kilojoules is useful for reading food labels in Australia, New Zealand and the EU, where energy is shown in kJ (often alongside kcal), and for science work. The "Calories" on US labels are kilocalories. Multiply by 4.184: a 2,000 kcal daily intake is 8,368 kJ, and a 250 kcal snack is about 1,046 kJ.
kcal to kJ conversion chart
| Kilocalories | Kilojoules |
|---|---|
| 1 kcal | 4.184 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 200 kcal | 836.8 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
| 1,500 kcal | 6,276 kJ |
| 2,000 kcal | 8,368 kJ |
| 2,500 kcal | 10,460 kJ |
FAQ
How many kJ is 100 kcal?
418.4 kJ.
How do I convert kcal to kJ?
Use kJ = kcal × 4.184. Or type the value above and the converter does it for you.
How do I convert kJ back to kcal?
Multiply by 0.239006, or press the ⇄ button in the converter.