Kilocalorie to Kilojoule
1 kcal = 4.184 kJ
How to convert kilocalorie to kilojoule
Enter the value in kilocalorie (kcal) above and the equivalent in kilojoule (kJ) updates as you type. This conversion comes up when understanding electricity bills (kWh) versus heater labels (BTU).
- A typical daily food intake: 2,000 kcal, about 8,370 kJ → that is 8368 kJ in kilojoule.
Typical situations: comparing food energy: calories vs kilojoules on imported packaging; sizing power banks and EV batteries (Wh, kWh).
You can also convert in the other direction: Kilojoule to Kilocalorie
Kilocalorie to Kilojoule conversion table
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
Watch out for
- Calorie (food) vs calorie (physics): food labels mean kilocalories, a factor of 1,000
- Power (kW) vs energy (kWh): a 5 kW heater running 2 hours uses 10 kWh
Frequently asked questions
How many kilojoules is 1 kilocalorie?
1 kilocalorie = 4.184 kilojoules.
What is the formula to convert kilocalorie to kilojoules?
The formula is: kJ = kcal × 4.184.
What is 10 kilocalories in kilojoules?
10 kilocalories = 41.84 kilojoules.