Kilocalorie to Kilojoule Converter (kcal to kJ)
1 kilocalorie = 4.184 kilojoule. The "calorie" on food labels is a kilocalorie (kcal).
Result
2,000 kcal = 8,368 kJ
How to convert kilocalorie to kilojoule
The "calorie" on food labels is a kilocalorie (kcal). One kcal is exactly 4.184 kJ. Europe, Australia and New Zealand show kilojoules, while the US shows Calories, so food labels often need converting.
Formula
kJ = kcal × 4.184
Worked example
2,000 kcal × 4.184 = 8,368 kJ
Kilocalorie to Kilojoule quick-reference table
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
| 2,000 kcal | 8,368 kJ |
Real-life examples
A 2,000 kcal daily diet is 8,368 kJ, and a 250 kcal snack is 1,046 kJ.
Frequently asked questions
How many kJ are in a kcal?
One kcal is 4.184 kJ.
Is a Calorie the same as a kcal?
Yes. A capital-C Calorie on food packages is a kilocalorie, equal to 1,000 small calories.
What is 1 kilocalorie in kilojoule?
1 kilocalorie = 4.184 kilojoule (kcal to kJ).
What is the formula to convert kcal to kJ?
kJ = kcal × 4.184. For example, 2,000 kcal × 4.184 = 8,368 kJ.
How do I convert kJ back to kcal?
Use the reverse converter: 1 kilojoule = 0.239006 kilocalorie. Check: 8,368 kJ converts back to 2,000 kcal.
Reverse conversion
Need the other direction? Kilojoule to Kilocalorie converter (kJ to kcal): 1 kilojoule = 0.239006 kilocalorie.
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