Calorie to Kilojoule
Convert cal to kJ instantly — free, no sign-up.
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About the Calorie (cal)
The Calorie is the small (thermochemical) calorie, defined as the energy needed to raise 1 gram of water by 1°C — not the unit on food labels, which uses the much larger kilocalorie.
About the Kilojoule (kJ)
The Kilojoule is equal to 1,000 joules, the unit used on nutrition labels in most countries outside the US alongside (or instead of) Calories.
How to convert cal to kJ
- Enter the value in cal in the box above.
- The kJ equivalent updates instantly.
- Use the swap button to convert kJ back to cal just as easily.