kJ to kcal
Compare energy on nutrition labels. Here kcal means a thermochemical kilocalorie, also called a food Calorie.
Edit either value. Use a decimal point; commas group thousands. Rounding affects display only.
How to convert kilojoules to kilocalories / food calories
Compare energy on nutrition labels. Here kcal means a thermochemical kilocalorie, also called a food Calorie.
Formula coefficients shown rounded. Calculations use the stored factors before display rounding.
A worked example
For 10 kJ, the result is approximately 2.390057361 kcal. To go the other way, edit the result above or swap the units.
A kilowatt-hour measures energy, not power. Calories here are thermochemical; a food Calorie is one kilocalorie.
Where the numbers come from
Factors follow NIST conversion references and documented unit definitions. Read our accuracy and rounding notes.
The table and method describe this page’s original pair. Changing units above does not change this reference section.
| Kilojoules (kJ) | Kilocalories / food Calories (kcal) |
|---|---|
| 1 | 0.2390057361 |
| 2 | 0.4780114723 |
| 5 | 1.195028681 |
| 10 | 2.390057361 |
| 20 | 4.780114723 |
| 25 | 5.975143403 |
| 50 | 11.95028681 |
| 100 | 23.90057361 |
| 500 | 119.5028681 |
| 1000 | 239.0057361 |