Kilocalories to Kilojoules

Compare food and metric energy labels

Kilocalories, often shown as capital-C Calories, are common on food labels in the United States. Kilojoules appear on labels in many other countries and follow the SI energy system. This converter applies the exact thermochemical relationship without adding nutritional assumptions to the entered energy value.

With the default input, 500 kilocalories converts to exactly 2,092 kilojoules. Reversing direction converts 1,000 kilojoules to 239.006 kilocalories. Label values may be rounded by regulation, so a package can display a nearby whole number even when the mathematical conversion is more precise.

Local energy conversion, not dietary advice

The number is calculated only in your browser and is not stored or sent elsewhere. The result translates units but does not assess a diet, serving, medical condition, or exercise plan. Nutrition decisions should use complete label information and appropriate professional guidance.