Calories to Kilojoules Converter
Convert food energy instantly between kilocalories and kilojoules.
Your details
Your result
Enter your details and calculate.
Results are educational estimates, not medical advice. Individual needs can vary.
Calories and kilojoules
Nutrition labels use kilocalories (often written “Calories”) or kilojoules. One kilocalorie equals exactly 4.184 kilojoules.
Quick examples
100 kcal equals 418.4 kJ; 1,000 kJ equals about 239 kcal.
How to use this result
Use the estimate as a practical starting point, then track how you feel and adjust gradually. For medical conditions, pregnancy, medication use, or major training changes, consult a qualified health professional.