Convert kilocalories to kilojoules
1 kcal = 4.184 kJ — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
4.184kJ
As a fraction: 523/125
1 kcal = 4.184 kJ
How to convert kilocalories to kilojoules
Multiply the number of kilocalories by 4.184 to get kilojoules.
The exact factor is 4.184 — as a fraction, 523/125.
Kilocalorie: The Calorie on food labels — 1000 small calories.
Kilocalorie to Kilojoule conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 |
| 2 kcal | 8.368 |
| 3 kcal | 12.552 |
| 5 kcal | 20.92 |
| 10 kcal | 41.84 |
| 20 kcal | 83.68 |
| 25 kcal | 104.6 |
| 50 kcal | 209.2 |
| 100 kcal | 418.4 |
| 250 kcal | 1046 |
| 500 kcal | 2092 |
| 1000 kcal | 4184 |
Kilojoule to Kilocalorie conversion table
| Kilojoules (kJ) | Kilocalories (kcal) |
|---|---|
| 1 kJ | 0.239 005 74 |
| 2 kJ | 0.478 011 47 |
| 3 kJ | 0.717 017 21 |
| 5 kJ | 1.195 028 7 |
| 10 kJ | 2.390 057 4 |
| 20 kJ | 4.780 114 7 |
| 25 kJ | 5.975 143 4 |
| 50 kJ | 11.950 287 |
| 100 kJ | 23.900 574 |
| 250 kJ | 59.751 434 |
| 500 kJ | 119.502 87 |
| 1000 kJ | 239.005 74 |
Frequently asked
How many kilojoules are in a kilocalorie?
One kilocalorie equals 4.184 kilojoules (kcal → kJ). That figure is exact, not rounded.
How do you convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184 to get kilojoules.
What is 1 kJ in kilocalories?
One kilojoule is 0.2390057361 kilocalories.
What is 10 kcal in kJ?
10 kcal = 41.84 kJ.
What exactly is a kilocalorie?
The Calorie on food labels — 1000 small calories.