1 kcal
4.1868 kJ
Kcal to kJ Converter (Kilocalories to Kilojoules)
1 kilocalorie (food Calorie) = 4.1868 kilojoules. To convert kcal to kJ, multiply by 4.1868.
1 kJ
0.2388 kcal
10 kcal
41.868 kJ
100 kcal
418.68 kJ
How to convert kcal to kJ
1 kilocalorie (food Calorie) equals 4.1868 kilojoules, so the conversion is a single multiplication.
kJ = kcal × 4.1868
Example: 150 kcal × 4.1868 = 628.02 kJ.
About the kilocalorie (food Calorie) and the kilojoule
Kilocalorie (food Calorie) (kcal)
The kilocalorie is the “Calorie” on food labels. It's roughly the energy needed to warm 1 kg of water by 1 °C.
Kilojoule (kJ)
The kilojoule is the metric energy unit printed on food labels in Australia and the EU next to, or instead of, kcal.
1 kilocalorie (food Calorie) in every energy unit
Kilojoules4.187 kJJoules4,186.8 J
Kilowatt-Hours0.001163 kWh
Calories1,000 cal
British Thermal Units3.968 Btu
Watt-Hours1.163 Wh
Megajoules0.004187 MJ
Gigajoules0.000004187 GJ
Megawatt-Hours0.000001163 MWh
Therms (US)0.00003969 thm
Electronvolts2.613e22 eV
Foot-Pounds3,088.025 ft·lbf
Ergs41,868,000,000 erg
Related conversions
kcal to kJ FAQ
How many kilojoules are in a kilocalorie (food Calorie)?
1 kilocalorie (food Calorie) = 4.1868 kilojoules.
How many kilocalories are in a kilojoule?
1 kilojoule = 0.2388458966 kilocalories.
How do I convert kcal to kJ?
Use kJ = kcal × 4.1868. For example, 10 kcal = 41.868 kJ.
Can I print this kcal to kJ chart?
Yes. Use "Print / Save PDF" next to the converter for a one-page chart, or "Download CSV" to open it in Excel or Google Sheets.