Calories to Kilojoules Conversion

Enter the energy in calories below to get the value converted to kilojoules.

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1 cal = 0.004184 kJ

How to Convert Calories to Kilojoules

To convert a calorie measurement to a kilojoule measurement, multiply the energy by the conversion ratio. One calorie is equal to 0.004184 kilojoules, so use this simple formula to convert:

kilojoules = calories × 0.004184

The energy in kilojoules is equal to the calories multiplied by 0.004184.

For example, here's how to convert 500 calories to kilojoules using the formula above.
500 cal = (500 × 0.004184) = 2.092 kJ

Calories and kilojoules are both units used to measure energy. Keep reading to learn more about each unit of measure.

Calories

One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as cal; for example, 1 calorie can be written as 1 cal.

Kilojoules

One kilojoule is equal to 1,000 joules, which are the energy equal to the force on an object of one newton at a distance of one meter.

The kilojoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "kilo" is the prefix for 103. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.

Calorie to Kilojoule Conversion Table

Calorie measurements converted to kilojoules
Calories Kilojoules
1 cal 0.004184 kJ
2 cal 0.008368 kJ
3 cal 0.012552 kJ
4 cal 0.016736 kJ
5 cal 0.02092 kJ
6 cal 0.025104 kJ
7 cal 0.029288 kJ
8 cal 0.033472 kJ
9 cal 0.037656 kJ
10 cal 0.04184 kJ
20 cal 0.08368 kJ
30 cal 0.12552 kJ
40 cal 0.16736 kJ
50 cal 0.2092 kJ
60 cal 0.25104 kJ
70 cal 0.29288 kJ
80 cal 0.33472 kJ
90 cal 0.37656 kJ
100 cal 0.4184 kJ
200 cal 0.8368 kJ
300 cal 1.2552 kJ
400 cal 1.6736 kJ
500 cal 2.092 kJ
600 cal 2.5104 kJ
700 cal 2.9288 kJ
800 cal 3.3472 kJ
900 cal 3.7656 kJ
1,000 cal 4.184 kJ