Calories to Kilojoules Conversion

Simply enter the energy in calories, select the desired calorie unit type, and click “Convert” to obtain the energy result in kilojoules. Use this tool to effortlessly convert between different calorie units for various applications. Click “Reset” to clear the fields and start a new conversion.

Calories to Kilojoules Conversion Calculator

Like this? Please share:

kJ to calories conversion ►

Small & Large Calories

In the realm of caloric measurement, we encounter two significant players: the small calorie (cal) and its grand counterpart, the large calorie (Cal). These two units of measurement serve as indicators of the energy content present in our food and beverages.

The small calorie, commonly represented as “cal,” signifies the amount of energy required to elevate the temperature of one gram of water by one degree Celsius, all within the confines of standard conditions—particularly at a pressure equivalent to one atmosphere. It may appear modest in stature, but it precisely quantifies the energy necessary for a mere gram of water.

Conversely, we encounter its larger-than-life sibling, aptly named the large calorie or occasionally referred to as the “Cal.” Symbolized as “Cal,” this unit takes the intensity up a notch by measuring the energy required to raise the temperature of an entire kilogram (equivalent to 1,000 grams) of water by a solitary degree Celsius under the aforementioned standard conditions.

How Do You Convert Calories into kJ?

Thermochemical Calories to kJ

1 cal_th = 0.004184 kJ

1 kJ = 239.005736 cal_th

The amount of energy, measured in kilojoules E_(kJ), can be determined by dividing the energy measured in thermochemical calories E_(calth) by the conversion factor of 239.005736.

Example

Convert 500 cal_th to kilojoules.

E_(kJ) = 500 cal_th / 239.005736 = 2.092 kJ

15°C calories to kJ

1 cal₁₅ = 0.0041855 kJ

1 kJ = 238.9201 cal₁₅

The amount of energy expressed in kilojoules E_(kJ) can be determined by dividing the energy measured in 15°C calories E_(cal15) by 238.9201:

E_(kJ) = E_(cal15) / 238.9201

Example

Convert 500 cal₁₅ to kilojoules.

E_(kJ) = 500cal₁₅ / 238.9201 = 2.09275 kJ

Large/food Calories to kJ

1 Cal = 4.184 kJ

1 kJ = 0.239 Cal

The amount of energy measured in kilojoules E_(kJ) can be calculated by multiplying the energy measured in large/food calories E_(Cal) by a factor of 4184:

E_(kJ) = 4.184 * E_(calth)

Example

Convert 0.5 Cal to kilojoules.

E_(kJ) = 4.184 * 0.5 Cal = 2.092 kJ

Calorie to Kilojoule Conversion Table

Here is a table showing various small thermochemical calories 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
150 cal	0.6276 kJ
200 cal	0.8368 kJ
250 cal	1.046 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
1000 cal	4.184 kJ
1200 cal	5.0208 kJ
1400 cal	5.8576 kJ
1500 cal	6.276 kJ
1700 cal	7.1128 kJ
2000 cal	8.368 kJ
3000 cal	12.552 kJ

See Also