How to use Calories to Kilojoules
Type a value in calories and the kilojoules figure appears straight away. The conversion table further down lists common values.
The formula
kJ = kcal × 4.184
Examples
- 1 calories to kilojoules
4.184 kJ
- 10 calories to kilojoules
41.84 kJ
- 250 calories to kilojoules
1,046 kJ
Calories to Kilojoules conversion table
| Calories | Kilojoules |
|---|---|
| 1 | 4.184 kJ |
| 2 | 8.368 kJ |
| 3 | 12.552 kJ |
| 4 | 16.736 kJ |
| 5 | 20.92 kJ |
| 6 | 25.104 kJ |
| 7 | 29.288 kJ |
| 8 | 33.472 kJ |
| 9 | 37.656 kJ |
| 10 | 41.84 kJ |
| 15 | 62.76 kJ |
| 20 | 83.68 kJ |
| 25 | 104.6 kJ |
| 30 | 125.52 kJ |
| 40 | 167.36 kJ |
| 50 | 209.2 kJ |
| 75 | 313.8 kJ |
| 100 | 418.4 kJ |
| 250 | 1,046 kJ |
| 500 | 2,092 kJ |
| 1,000 | 4,184 kJ |
Limitations and assumptions
Uses the stated standard definitions. Treats a food Calorie as one kilocalorie (4.184 kJ).
Frequently asked questions
How many kilojoules are in one calory?
One calory equals 4.184 kJ. The formula is kJ = kcal × 4.184.
How do I convert calories to kilojoules?
Use kJ = kcal × 4.184. For example, 10 calories gives 41.84 kJ. Enter your own value above and the converter does the arithmetic for you.
How do I convert kilojoules back to calories?
Invert the relationship: reverse the formula so you divide where this one multiplies (and subtract where it adds).
Is this conversion exact?
Energy and power units mix SI and traditional definitions, so check whether a "calorie" means a small calorie or a food Calorie (kilocalorie).