Kilocalories to Gigajoules Conversion

Enter the energy in kilocalories below to get the value converted to gigajoules.

Results in Gigajoules:
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1 kcal = 4.184E-6 GJ
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Kilocalories to Gigajoules

To convert a kilocalorie measurement to a gigajoule measurement, multiply the energy by the conversion ratio.

Since one kilocalorie is equal to 4.184E-6 gigajoules, you can use this simple formula to convert:

gigajoules = kilocalories × 4.184E-6

The energy in gigajoules is equal to the kilocalories multiplied by 4.184E-6.

For example, here's how to convert 500,000 kilocalories to gigajoules using the formula above.
500,000 kcal = (500,000 × 4.184E-6) = 2.092 GJ

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


One kilocalorie, is equal to the heat needed to raise the temperature of one kilogram of water from 14.5 to 15.5 degrees Celsius.

Kilocalories can be abbreviated as kcal; for example, 1 kilocalorie can be written as 1 kcal.

When being used to measure nutrition or metabolic processes, the large calorie is used, which is equal to one kilocalorie.


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

The gigajoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "giga" is the prefix for 109. Gigajoules can be abbreviated as GJ; for example, 1 gigajoule can be written as 1 GJ.

Kilocalorie to Gigajoule Conversion Table

Kilocalorie measurements converted to gigajoules
Kilocalories Gigajoules
1 kcal 0.000004184 GJ
2 kcal 0.000008368 GJ
3 kcal 0.000012552 GJ
4 kcal 0.000016736 GJ
5 kcal 0.00002092 GJ
6 kcal 0.000025104 GJ
7 kcal 0.000029288 GJ
8 kcal 0.000033472 GJ
9 kcal 0.000037656 GJ
10 kcal 0.00004184 GJ
100 kcal 0.000418 GJ
1,000 kcal 0.004184 GJ
10,000 kcal 0.04184 GJ
100,000 kcal 0.4184 GJ
1,000,000 kcal 4.184 GJ

More Kilocalorie & Gigajoule Conversions