Calories to Kilojoules formula
kilojoules = calories × 0.004184
Multiply the number of calories by 0.004184 to get kilojoules. To go the other way, multiply by 239.006 instead, or use the kj to calories converter.
Calories to Kilojoules conversion table
Common calories to kj values, rounded for reading. The converter above keeps full precision.
| Calories | Kilojoules |
|---|---|
| 1 cal | 0.004184 kJ |
| 2 cal | 0.008368 kJ |
| 3 cal | 0.012552 kJ |
| 4 cal | 0.016736 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 15 cal | 0.06276 kJ |
| 20 cal | 0.08368 kJ |
| 25 cal | 0.1046 kJ |
| 50 cal | 0.2092 kJ |
| 75 cal | 0.3138 kJ |
| 100 cal | 0.4184 kJ |
| 250 cal | 1.046 kJ |
| 500 cal | 2.092 kJ |
| 1,000 cal | 4.184 kJ |
Worked example
To convert 10 cal to kilojoules, multiply by 0.004184: the result is 0.04184 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 calorie?
One calorie equals 0.004184 kilojoules (1 cal = 0.004184 kJ).
What is 10 calories in kilojoules?
10 cal converts to 0.04184 kJ. Enter any other value in the converter above to see it recalculated instantly.
How do I convert kilojoules back to calories?
Reverse the calculation: one kilojoule equals 239.006 calories. You can also swap the units in the converter or open the kj to calories page.
Related energy conversions
Need a different pair? Open the full energy converter to choose any two units.