How to convert kilocalories to kilojoules
One kilocalorie equals 4.184 kilojoules, so multiply the value in kilocalories by 4.184: kJ = kcal × 4.184.
Example: 10 kcal = 10 × 4.184 = 41.84 kJ.
Kilocalories to kilojoules table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 0.1 | 0.4184 |
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 6 | 25.104 |
| 7 | 29.288 |
| 8 | 33.472 |
| 9 | 37.656 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 30 | 125.52 |
| 40 | 167.36 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
About the units
- Kilocalorie (kcal): The “Calorie” on food labels: the energy to heat 1 kg of water by 1 °C, 4,184 J.
- Kilojoule (kJ): One thousand joules; food labels in Australia and the EU list energy in kJ.
Need the other direction? Convert kilojoules to kilocalories — 1 kilojoule = 0.239 kilocalories.
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Open the unit converter Frequently asked questions
How many kilojoules are in a kilocalorie?
1 kilocalorie = 4.184 kilojoules.
What is the formula for kilocalories to kilojoules?
kJ = kcal × 4.184.
How much is 10 kcal in kJ?
10 kcal = 41.84 kJ.