Kilocalories to Kilojoules formula
kilojoules = kilocalories × 4.184
Multiply the number of kilocalories by 4.184 to get kilojoules. To go the other way, multiply by 0.239006 instead, or use the kj to kcal converter.
Kilocalories to Kilojoules conversion table
Common kcal to kj values, rounded for reading. The converter above keeps full precision.
| Kilocalories | Kilojoules |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
Worked example
To convert 10 kcal to kilojoules, multiply by 4.184: the result is 41.84 kJ. A nutritional Calorie is a kilocalorie, equal to 4,184 joules. The smaller scientific calorie equals 4.184 joules.
Frequently asked questions
How many kilojoules are in a kilocalorie?
One kilocalorie equals 4.184 kilojoules (1 kcal = 4.184 kJ).
What is 10 kilocalories in kilojoules?
10 kcal converts to 41.84 kJ. Enter any other value in the converter above to see it recalculated instantly.
How do I convert kilojoules back to kilocalories?
Reverse the calculation: one kilojoule equals 0.239006 kilocalories. You can also swap the units in the converter or open the kj to kcal page.
Related energy conversions
Need a different pair? Open the full energy converter to choose any two units.