kcal to kJ Converter
1 kcal = 4.184 kJ. Enter a value. The result updates immediately.
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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; this calculator uses the thermochemical calorie at exactly 4.184 joules and the International Table BTU.
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
- Enter the value in kcal.
- Select kcal as the source unit.
- Select kJ as the target unit.
- Read or copy the result.
kcal to kJ chart
| kcal | kJ |
|---|---|
| 1 kcal | 4.184 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 500 kcal | 2,092 kJ |
Formula
kJ = kcal x 4.184
Example: 1 kcal = 4.184 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 = 4.184 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.