Kilocalories to Kilojoules Converter
Convert kilocalories (kcal) to kilojoules (kJ) instantly. Type a value above and the result updates while you type. 1 kilocalorie equals 4.184 kilojoules.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 kilocalorie = 4.184 kilojoules
Multiply the kilocalories value by 4.184 to get kilojoules. Or divide by 0.239006 to go the other way.
Kilocalories to kilojoules conversion table
| kcal | kJ |
|---|---|
| 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 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
Worked examples
- 5 kcal × 4.184 = 20.92 kJ
- 30 kcal × 4.184 = 125.52 kJ
- 165 kcal × 4.184 = 690.36 kJ
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
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Frequently asked questions
How many kilojoules are in 1 kilocalorie?
1 kilocalorie equals 4.184 kilojoules (kcal → kJ).
How do you convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184. For example: 10 kcal × 4.184 = 41.84 kJ.
What is 50 kcal in kJ?
50 kcal equals 209.2 kJ.
Which is bigger: 1 kilocalorie or 1 kilojoule?
1 kilocalorie is bigger: it equals 4.184 kilojoules.