Cal to kJ conversion

With the tool on the page, you can automatically translate between Cal and kJ weight measurements. The conversion process you will make works automatically based on the calorie-kj conversion formula. To perform the conversion, simply enter the value you want in the box below and press the “Convert” button. The result will appear immediately below.

Cal to kJ conversion

Calorie Unit Type

Energy in calories

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Conversion result
kJ

How to convert from cal to kJ

Things to consider when choosing a calorie unit type:

Small calorie (cal) is the energy required to raise 1 gram of water by 1°C at 1 atmosphere of pressure.
Large calorie (Cal) is the energy required to raise 1 kg of water at 1 atmosphere pressure by 1°C.
Large calorie is also called food calorie and is used as a unit of food energy.

Converting thermochemical calories to kJ:

1 cal_th = 0.004184 kJ

1 kJ = 239.005736 cal_th

Conversion to 15° C calorie kJ:

1 cal₁₅ = 0.0041855 kJ

1 kJ = 238.9201 cal₁₅

Big / food calories up to KJ

1 Cal = 4.184 kJ

1 kJ = 0.239 Cal

Cal kJ conversion formula

Energy in kilojoules E_(kJ) equals the energy in the thermochemical E_(calth) calorie divided by 239.005736:

E_(kJ) = E_(calth) / 239.005736

Energy in kilojoules E_(kJ) equals the energy in 15 °C calorie E_(cal15) divided by 238.9201:

E_(kJ) = E_(cal15) / 238.9201

Energy in kilojoules E_(kJ) is equal to 4184 times the energy in large / food calorie E_(Cal):

E_(kJ) = 4.184 × E_(calth)

Example

Converting 300 cal_th to kilojoules:

E_(kJ) = 300 health / 239.005736 = 1.2552 kJ

Converting 300 cal₁₅ to kilojoules:

E_(kJ) = 300cal15 / 238.9201 = 1.25565 kJ

Converting 0.3 Cal to kilojoules:

E_(kJ) = 4.184 × 0.3 Cal = 1.2552 kJ