How many calories are in a kilojoule?

One kilojoule equals about 0.239 food calories (kcal). Divide your kilojoule figure by 4.184 to get calories.

Why do food labels use kilojoules?

Many countries, including Australia, use kilojoules as the official unit of food energy, while others use kilocalories — this tool converts between them.

Is anything uploaded?

No — every conversion happens locally in your browser and nothing is sent to a server.

Kilojoules to Calories Converter

Convert kilojoules to food calories (kcal), both directions.

Kilojoules to calories converter

When a nutrition label shows energy in kilojoules (kJ) and you think in calories (kcal), divide by the exact factor: kcal = kJ ÷ 4.184.

Enter a value in either field and the other updates instantly. All maths runs in your browser — no data leaves your device.