How to convert kilocalories to kilojoules
To convert kilocalories (kcal) to kilojoules (kJ), multiply the value in kilocalories by 4.184.
kJ = kcal × 4.184
Example: 5 kcal = 20.92 kJ.
You can also type 5 kcal to kJ into the smart calculator, or mix units: 1 kcal + 1 kJ.
Kilocalories to Kilojoules conversion table
| Kilocalories | Kilojoules |
|---|---|
| 0.01 kcal | 0.04184 kJ |
| 0.1 kcal | 0.4184 kJ |
| 0.25 kcal | 1.046 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 6 kcal | 25.104 kJ |
| 7 kcal | 29.288 kJ |
| 8 kcal | 33.472 kJ |
| 9 kcal | 37.656 kJ |
| 10 kcal | 41.84 kJ |
| 12 kcal | 50.208 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 30 kcal | 125.52 kJ |
| 40 kcal | 167.36 kJ |
| 50 kcal | 209.2 kJ |
| 60 kcal | 251.04 kJ |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
Converting kilojoules back to kilocalories
1 kJ = 0.2390057361 kcal. See the Kilojoules to Kilocalories converter, or press the swap button above.
About the units
Kilocalorie (kcal)
One thousand calories, the "Calorie" printed on food labels.
Kilojoule (kJ)
One thousand joules. Food labels in Australia and Europe show kJ alongside kcal.
Energy is the capacity to do work. The SI unit is the joule. Food energy is labelled in kilocalories (Calories with a capital C) or kilojoules, electricity is billed in kilowatt-hours, and heating often uses BTU or therms.
Questions and answers
How many kilojoules are in a kilocalorie?
One kilocalorie (kcal) equals 4.184 kilojoules (kJ).
How do I convert kilocalories to kilojoules?
To convert kilocalories to kilojoules, multiply the value in kilocalories by 4.184. The formula is kJ = kcal × 4.184. For example, 5 kcal = 20.92 kJ.
What is 5 kcal in kJ?
5 kilocalories is 20.92 kilojoules.
Which is bigger, a kilocalorie or a kilojoule?
A kilocalorie is bigger: 1 kcal = 4.184 kJ.
Are Calories on food labels the same as calories?
No. The food Calorie (capital C) is a kilocalorie: 1,000 small calories, or 4.184 kilojoules.
Does this kcal to kJ converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.