How to convert kilocalories to kilojoules
kJ = kcal × 4.184
Example: 5 kcal × 4.184 = 20.92 kJ
Kilocalories to Kilojoules table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 6 kcal | 25.104 kJ |
| 7 kcal | 29.288 kJ |
| 8 kcal | 33.472 kJ |
| 9 kcal | 37.656 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 30 kcal | 125.52 kJ |
| 40 kcal | 167.36 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 |
| 1,000 kcal | 4,184 kJ |
About these units
Kilocalories (kcal): A kilocalorie is the “Calorie” on food labels: 4.184 kilojoules.
Kilojoules (kJ): A kilojoule is 1,000 joules. Food labels in Europe and Australia show energy in kJ.
Frequently asked questions
How many kilojoules are in 1 kilocalorie?
1 kilocalorie (kcal) equals 4.184 kilojoules (kJ).
How do I convert kcal to kJ?
Multiply the value in kilocalories by 4.184. For example, 5 kcal × 4.184 = 20.92 kJ.
How do I convert kilojoules back to kilocalories?
Multiply by 0.2390057361 (or divide by 4.184). 1 kJ = 0.2390057361 kcal.
What is a kilocalorie?
A kilocalorie is the “Calorie” on food labels: 4.184 kilojoules.
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every energy unit at once? Use the Energy Converter.