Convert Calories to Kilojoules
Calories to Kilojoules conversion table
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 1 cal | 0.004184 kJ |
| 2 cal | 0.008368 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 25 cal | 0.1046 kJ |
| 50 cal | 0.2092 kJ |
| 100 cal | 0.4184 kJ |
| 200 cal | 0.8368 kJ |
| 500 cal | 2.092 kJ |
| 1000 cal | 4.184 kJ |
How to convert calories to kilojoules
The cal-to-kJ conversion appears often when working with energy data across different unit systems. Energy conversions connect food nutrition labels (calories), electricity bills (kWh), and scientific measurements in joules or BTU.
Formula: Multiply the calories value by 0.004184. In equation form: kJ = cal × 0.004184.
One calories equals approximately 0.004184 kJ. This means you can multiply any cal value by 0.004184 to get the equivalent in kJ.
For instance, converting 1 cal gives 0.004184 kJ. Try different values using the quick-value chips or type directly into the input field.
Common mistake: Food calories on nutrition labels are actually kilocalories (kcal), which confuses many people when comparing to joules or watt-hours.
Bookmark this page for quick cal to kJ conversions, or use the swap button to reverse the direction and convert kJ back to cal.
Related conversions
Frequently asked questions
1 cal equals 0.004184 kJ.
Multiply the calories value by 0.004184.
10 cal = 0.04184 kJ.