The short answer
- 1 kcal = 4.184 kJ
- 1 kJ ≈ 0.2390057 kcal
Worked example2,000 kcal × 4.184 = 8,368 kJ
UNIT CONVERSION
← Energy converterKilocalories to kilojoules
To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184.
What the units mean
Kilocalorie. The kilocalorie, written as 'Calories' on food labels, is 4,184 joules (thermochemical definition).
Kilojoule. The kilojoule is 1,000 joules, the SI unit of energy. Food labels in Australia, New Zealand and the EU give energy in kJ.
Kilocalories to kilojoules table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 10 | 41.84 |
| 50 | 209.2 |
| 100 | 418.4 |
| 150 | 627.6 |
| 200 | 836.8 |
| 250 | 1,046 |
| 300 | 1,255.2 |
| 400 | 1,673.6 |
| 500 | 2,092 |
| 600 | 2,510.4 |
| 750 | 3,138 |
| 1,000 | 4,184 |
| 1,500 | 6,276 |
| 1,800 | 7,531.2 |
| 2,000 | 8,368 |
| 2,500 | 10,460 |
| 3,000 | 12,552 |
Values are rounded to 7 significant figures.
Common questions
How do I convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184. For example, 2,000 kcal × 4.184 = 8,368 kJ.
How many kilojoules are in one kilocalorie?
One kilocalorie is exactly 4.184 kilojoules.
Is this conversion exact?
Yes. Both units have exact legal definitions, so the factor is exact. Values on this page are rounded to 7 significant figures.