Calorie to Kilojoule Converter (cal to kJ)

How to Convert Calorie to Kilojoule

Formula: Kilojoule = Calorie × 0.004184

Example: 1 cal = 0.004184 kJ

You can also use the interactive converter above. Simply enter any Calorie value and the equivalent Kilojoule value will appear instantly. Click the ⇄ button to reverse the conversion.

To get more out of this conversion, it helps to know where Calorie and Kilojoule actually show up in daily life, plus the quick facts people usually search for.

Step-by-step example — Convert 1000 cal to kJ:

What is Calorie and Kilojoule?

A Calorie (cal) is a small energy unit originally defined as the heat needed to raise one gram of water by one degree Celsius.

A Kilojoule (kJ) equals 1,000 joules and is used on nutrition labels in many countries outside the US.

Real World Uses of Calorie to Kilojoule Conversion

• Calorie: Commonly used for used in scientific calorimetry experiments.
• Kilojoule: Commonly used for labeling food energy content in countries using the metric system.
• Calorie: Commonly used in older nutrition science before kilocalories became the everyday standard.
• Kilojoule: Commonly used in engineering and chemistry for everyday-scale energy calculations.

Frequently Asked Questions

What is the formula to convert Calorie to Kilojoule?

The formula is: Kilojoule = Calorie x 0.004184. Multiply any Calorie value by 0.004184 to get the equivalent in Kilojoule.

What is 1 Calorie in Kilojoule?

1 cal = 0.004184 kJ.

How many Calorie are in 1 Kilojoule?

1 kJ = 239.005736137667 cal.

Is Calorie bigger or smaller than Kilojoule?

Calorie is smaller than Kilojoule. 1 Kilojoule = 239.005736137667 cal.

What is 500 cal in kJ?

500 cal = 2.092 kJ.

What is 1000 kJ in cal?

1000 kJ = 239,005.7361 cal.

How is 1 calorie defined?

1 calorie is defined as the heat needed to raise the temperature of 1 gram of water by 1°C.