Convert kilocalories to kilojoules
Kilocalorie (kcal) to kilojoule (kJ). One kilocalorie equals 4.184 kilojoules.
Formula
Kilocalorie to kilojoule conversion table
| Kilocalories | Kilojoules | Kilojoules | Kilocalories |
|---|---|---|---|
| 1 kcal | 4.184 kJ | 1 kJ | 0.239006 kcal |
| 2 kcal | 8.368 kJ | 2 kJ | 0.478011 kcal |
| 3 kcal | 12.552 kJ | 3 kJ | 0.717017 kcal |
| 5 kcal | 20.92 kJ | 5 kJ | 1.195 kcal |
| 10 kcal | 41.84 kJ | 10 kJ | 2.3901 kcal |
| 20 kcal | 83.68 kJ | 20 kJ | 4.7801 kcal |
| 50 kcal | 209.2 kJ | 50 kJ | 11.9503 kcal |
| 100 kcal | 418.4 kJ | 100 kJ | 23.9006 kcal |
| 500 kcal | 2092 kJ | 500 kJ | 119.5 kcal |
| 1000 kcal | 4184 kJ | 1000 kJ | 239.01 kcal |
To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184. One kilocalorie equals 4.184 kilojoules, and one kilojoule equals 0.239006 kilocalories, so the relationship is fixed and exact. As a worked example, 10 kcal comes to 41.84 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 kilocalorie values already worked out in kilojoules, plus the reverse kilojoule to kilocalorie direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many kilojoules are in a kilocalorie?
One kilocalorie equals 4.184 kilojoules. The ratio is constant, so you can multiply any number of kilocalories by 4.184 to get kilojoules.
What is the formula to convert kilocalories to kilojoules?
Use kilojoules = kilocalories × 4.184. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert kilojoules back to kilocalories?
Go the other way by using one kilojoule equals 0.239006 kilocalories. You can also press the swap button in the converter above to flip the direction in one click.
Is this kilocalorie 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.