Energy
kcal to kJ Converter
1 kcal = 4.1868 kJ. Enter any value and the result updates instantly.
Convert
Accuracy and rounding
Compare food-energy kilocalories with the kilojoules used on many nutrition labels.
Energy units share a fixed joule reference. Food Calories are kilocalories, while a small calorie is 4.1868 joules.
For billing, nutrition, or engineering, match the precision of the original kJ data and keep the energy/power distinction explicit.
How to convert kcal to kJ
- Type the kcal value in the calculator.
- Keep kcal selected as the from unit and kJ selected as the to unit.
- Use the instant result, or copy it with the copy button.
kcal to kJ chart
| kcal | kJ |
|---|---|
| 1 kcal | 4.1868 kJ |
| 5 kcal | 20.934 kJ |
| 10 kcal | 41.868 kJ |
| 50 kcal | 209.34 kJ |
| 100 kcal | 418.68 kJ |
| 500 kcal | 2,093.4 kJ |
Formula
kJ = kcal x 4.1868
Example: 1 kcal = 4.1868 kJ.
Source
Energy factors from NIST SI conversion tables, using the joule as the shared reference unit.
Common questions
How do I convert kcal to kJ?
Enter the kcal value in the converter, or multiply by the factor shown in the formula. 1 kcal = 4.1868 kJ.
What should I watch out for?
Do not confuse energy with power: kWh is accumulated energy, while kW is a rate of energy transfer.
Where does this energy conversion come from?
Energy factors from NIST SI conversion tables, using the joule as the shared reference unit. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.