kcal to kJ Converter
Convert kcal to kJ instantly with a reference conversion table.
| kcal | kJ |
|---|
How to convert kcal to kJ
Enter your value
Type the number of kcal you want to convert into the left box. The result in kj appears instantly in the right box. You can also type into the right box to convert in the other direction.
Use the swap button
Click the ⇄ Swap button to reverse the conversion — kJ to kcal. Your current value carries across so you don't have to re-enter anything.
About kcal and kJ
kcal and kJ are common energy measurements.
1 kcal = 4.184 kJ exactly. EU food labels show both; UK labels often only kcal. The 'Calories' on a US food label (capital C) = kcal — but UK and EU lower-case 'calories' technically means small calories. Confusing!
| kcal | kJ |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 50 | 209.2 |
| 100 | 418.4 |
Frequently asked questions
How do I convert kcal to kJ?
To convert kcal to kJ, multiply by 4.184. Or use the calculator above for instant results.
How many kJ are in 1 kcal?
1 kcal equals 4.184 kJ.
Is the kcal to kJ converter free?
Yes, the kcal to kJ converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.