Kilojoules to Kilocalories Converter

About this converter

Food labels in the UK often show energy in both kilojoules and kilocalories, but many people prefer one unit over the other. This converter uses the exact relationship 1 kilocalorie = 4.184 kilojoules, which comes from the modern definition of the calorie based on joules. To change kJ to kcal, divide by 4.184. To change kcal to kJ, multiply by 4.184. The results update as you type, and you can pick a rounding level that suits nutrition labels, fitness apps or meal plans. Presets give you common values from everyday packets and typical portions, so sense checking a label or logging a workout takes seconds. Because the factor is exact, there is no ambiguity between brands or countries, and you do not need a table of approximate values. Use this tool to compare products, set targets, translate recipes, or convert treadmill readouts into the format you use most. If you are planning meals or tracking weight goals, bookmark this page so you can move quickly between units without opening a spreadsheet. It is designed to save time and keep the maths out of your way.