Convert calorie (nutritional / food calorie) to kilojoule instantly. Type in either field — results update live.
Selected Cal values converted to kJ using the exact factor from this tool.
| Cal | kJ |
|---|---|
| 0.01 | 0.04184 |
| 0.1 | 0.4184 |
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 1,000 | 4,184 |
Exact conversion factors in both directions, plus a worked example.
1 Cal = 4.184 kJ
1 kJ = 0.2390057361 Cal
To convert calorie (nutritional / food calorie) to kilojoule, multiply by 4.184.
To convert kilojoule to calorie (nutritional / food calorie), multiply by 0.2390057361.
Example: convert 10 Cal to kJ
10 × 4.184 = 41.84 kJ
Short background on the units used in this conversion.
The food Calorie (capital C) equals one kilocalorie — 4,184 joules in this converter (thermochemical kcal, matching nutrition labels).
Food Calories label packaged meals, diet apps, and nutrition facts panels worldwide.
A kilojoule is one thousand joules — the metric counterpart to the kilocalorie on food labels.
Kilojoules appear on Australian and European nutrition labels alongside or instead of kilocalories.
kJ = Cal × 4.184Cal = kJ × 0.2390057361, using the same exact factors as this converter.Jump to any energy conversion starting from calorie (nutritional / food calorie) — including the reverse direction and every other unit in our dataset.