Calorie (cal)
The calorie is used for heat energy and often appears in nutrition and chemistry.
History: the calorie originated in heat science as a quantity of heat related to warming water.
Quickly convert calories to kilojoules without lookup tables or manual math.
This page is focused on converting calories to kilojoules. Type a number into the first field and the result appears immediately in the second field.
Example: 1 cal = 0.004184 kJ. Conversion formula: result = value × 4.184 / 1000.
Use this converter for everyday calculations, study notes, engineering checks, and quick value verification without installing a separate app.
The calorie is used for heat energy and often appears in nutrition and chemistry.
History: the calorie originated in heat science as a quantity of heat related to warming water.
The kilojoule equals 1000 joules and is convenient for food energy, heat, and engineering calculations.
History: the kilojoule became a convenient multiple of the joule for food, heat, and engineering calculations.
Enter a value in the Calorie field. The converter applies the formula "result = value × 4.184 / 1000" and immediately shows the result in kilojoules.
1 cal = 0.004184 kJ.
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