KCAL to KJ Converter
Useful for nutrition labels, meal planning and diet apps that switch between kilocalories and kilojoules.
1 kcal = 4.184 kJ
kilojoules
1 kcal = 4.184 kJ
How to convert kilocalories to kilojoules
Multiply the number of kilocalories by 4.184.
Formula
kJ = kcal × 4.184
Examples
- 100 kcal × 4.184 = 418.4 kJ
- 500 kcal × 4.184 = 2,092 kJ
- 2,000 kcal × 4.184 = 8,368 kJ
Kilocalories to kilojoules conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 10 | 41.84 |
| 50 | 209.2 |
| 100 | 418.4 |
| 150 | 627.6 |
| 200 | 836.8 |
| 250 | 1,046 |
| 300 | 1,255.2 |
| 400 | 1,673.6 |
| 500 | 2,092 |
| 750 | 3,138 |
| 1,000 | 4,184 |
| 1,500 | 6,276 |
| 2,000 | 8,368 |
| 2,500 | 10,460 |
| 3,000 | 12,552 |
Values rounded to 4 decimal places or 4 significant digits.
About kilocalories
A kilocalorie is 1,000 calories, or 4,184 joules. It is the "Calorie" on food labels, sometimes written with a capital C.
About kilojoules
A kilojoule is 1,000 joules. Food labels in the EU, Australia and New Zealand show energy in kilojoules, usually next to kilocalories.
Frequently asked questions
How many kilojoules are in one kilocalorie?
One kilocalorie equals 4.184 kilojoules.
How do I convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184. For example: 500 kcal × 4.184 = 2,092 kJ.
How many kilocalories are in one kilojoule?
One kilojoule equals 0.239 kilocalories.
Is the kcal to kJ conversion exact?
Yes. The factor follows directly from the official definitions of both units, so the only rounding is in how many decimals are displayed.