⚡ Energy converter
Kilocalories to Kilojoules Converter
Convert kilocalories (kcal) to kilojoules (kJ) instantly. Includes formula, worked example, and a full reference chart from 1 to 1000 kcal.
Kilocalories
kcal
Kilojoules
kJ
How to convert kilocalories to kilojoules
One food kilocalorie (kcal) equals 4.184 kilojoules. To convert kcal to kJ, multiply by 4.184. A 500 kcal meal contains about 2,092 kJ.
Formula
kJ = kcal × 4.184
Worked example
Convert 500 kcal to kJ:
500 kcal × 4.184 → 2,092 kJ
500 kcal × 4.184 → 2,092 kJ
Common kilocalories to kilojoules values
Quick reference for common kilocalorie values:
- 1 kcal = 4.184 kJ
- 5 kcal = 20.92 kJ
- 10 kcal = 41.84 kJ
- 100 kcal = 418.4 kJ
Kilocalories to Kilojoules conversion table
Full reference chart — useful for cooking, fitness, engineering, or homework.
| Kilocalories | Kilojoules |
|---|---|
| 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 |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1000 kcal | 4,184 kJ |
Kilojoules to Kilocalories table (reverse)
Looking the other way? Here's the reverse conversion:
| Kilojoules | Kilocalories |
|---|---|
| 1 kJ | 0.239006 kcal |
| 2 kJ | 0.478011 kcal |
| 3 kJ | 0.717017 kcal |
| 5 kJ | 1.195029 kcal |
| 10 kJ | 2.390057 kcal |
| 20 kJ | 4.780115 kcal |
| 25 kJ | 5.975143 kcal |
| 50 kJ | 11.950287 kcal |
| 75 kJ | 17.92543 kcal |
| 100 kJ | 23.900574 kcal |
| 250 kJ | 59.751434 kcal |
| 500 kJ | 119.502868 kcal |
| 1000 kJ | 239.005736 kcal |
Frequently asked questions
How many kilojoules are in 1 kilocalorie?
There are 4.184 kJ in 1 kcal.
How many kilojoules are in 10 kilocalories?
10 kcal = 41.84 kJ.
How many kilocalories are in 1 kilojoule?
1 kJ = 0.239006 kcal.
What is the formula to convert kilocalories to kilojoules?
The formula is kJ = kcal × 4.184.
Are kilocalories the same in the US and UK?
Food labels in most countries outside the US display kilojoules (kJ); US labels show kilocalories (kcal), often called "calories".