Convert calories to kilojoules
Calorie (cal) to kilojoule (kJ). One calorie equals 0.004184 kilojoules.
Formula
Calorie to kilojoule conversion table
| Calories | Kilojoules | Kilojoules | Calories |
|---|---|---|---|
| 1 cal | 0.004184 kJ | 1 kJ | 239.01 cal |
| 2 cal | 0.008368 kJ | 2 kJ | 478.01 cal |
| 3 cal | 0.012552 kJ | 3 kJ | 717.02 cal |
| 5 cal | 0.02092 kJ | 5 kJ | 1195.03 cal |
| 10 cal | 0.04184 kJ | 10 kJ | 2390.06 cal |
| 20 cal | 0.08368 kJ | 20 kJ | 4780.11 cal |
| 50 cal | 0.2092 kJ | 50 kJ | 11950.29 cal |
| 100 cal | 0.4184 kJ | 100 kJ | 23900.57 cal |
| 500 cal | 2.092 kJ | 500 kJ | 119502.87 cal |
| 1000 cal | 4.184 kJ | 1000 kJ | 239005.74 cal |
To convert calories to kilojoules, divide the number of calories by 239.01. One calorie equals 0.004184 kilojoules, and one kilojoule equals 239.01 calories, so the relationship is fixed and exact. As a worked example, 10 cal comes to 0.04184 kJ. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a energy conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common calorie values already worked out in kilojoules, plus the reverse kilojoule to calorie direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many kilojoules are in a calorie?
One calorie equals 0.004184 kilojoules. The ratio is constant, so you can multiply any number of calories by 0.004184 to get kilojoules.
What is the formula to convert calories to kilojoules?
Use kilojoules = calories ÷ 239.01. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert kilojoules back to calories?
Go the other way by using one kilojoule equals 239.01 calories. You can also press the swap button in the converter above to flip the direction in one click.
Is this calorie to kilojoule converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.