Kcal to kJ conversion formula
1 kilocalorie = 4.184 kilojoule
The kilocalorie (kcal), called “calorie” on food labels, equals 4,184 joules — the energy to heat 1 kg of water by 1 °C.
The kilojoule (kJ) is the metric energy unit used on Australian and European food labels (1 kcal = 4.184 kJ).
Kcal to kJ conversion table
| kcal | kJ |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1046 kJ |
| 500 kcal | 2092 kJ |
| 1000 kcal | 4184 kJ |
How to convert kcal to kJ
- Write down the value in kcal you want to convert.
- Multiply it by 4.184 — or use the converter above, which does it instantly.
- Read your result in kJ. Done.
Frequently asked questions
How many kJ is 1 kcal?
Using the official conversion factor, 1 kilocalorie = 4.184 kilojoule. The converter above handles any value instantly.
What is the formula to convert kilocalorie to kilojoule?
1 kilocalorie = 4.184 kilojoule. Multiply any value in kcal by this factor to get kJ.
Is this kcal to kJ converter free?
Yes — 100% free, unlimited, with no sign-up. CalculUnits is funded by non-intrusive ads, never by paywalls.