The kilojoule is an SI unit of energy equal to 1,000 joules. In other words, it's a measure of the energy needed to produce one newton (N) of force over a distance of 1 meter.
Computers often measure data by using units. The kilojoule, for example, uses prefixes to measure multiples or submultiples of the unit it is currently set to. One instance of this is with the prefix "kilo," which signifies 1000 times the number (e.g. 500 kilojoules).
In countries that use SI, the kilojoule is one of the most popular measurements of energy. In some cases, both kilojoules and kilocalories are displayed on food labels. However, in the US only kilocalories are shown (often referred to as "calories") on most food labels. Aside from everyday use for cooking, this measurement is used within scientific contexts around the world.
Energy is defined as the capacity to do artwork, physical work or produce heat. One kilocalorie (1000 calories) is equal to 4.1868 kilojoules of energy. A calorie is a unit of energy in the metric system and is notated with a capital C; it's equal to 1001 small calories. One small calorie (1/1000 C) is equivalent to 4.1868 joules of energy or one-thousandth of a large calorie.
The kilocalorie shares its name with the small calorie, but it is defined in terms of kilograms rather than grams. The term comes from the Latin term calor meaning heat, and the unit was originally defined as a unit of heat energy in 1824 by Nicholas Clement. However, the kilocalorie had to wait a few more years until being introduced in America. This happened when Wilbur Olin Atwater presented it as part of his definition for dietary energy in 1887.
There are some countries that haven't adopted the International System of Units, so kilocalories, or calories, are typically used in those locations. So, when one food item is 480 calories per serving and another is 30 calories per serving, this would mean that the first food is 2.625 times as nutritious as the second.
Kilojoule to Kilocalorie (th) Conversion Table
Kilojoule [kJ] Kilocalorie (th) [kcal (th)]
0.01 kJ 0.0023900574 kcal (th)
0.1 kJ 0.0239005736 kcal (th)
1 kJ 0.2390057361 kcal (th)
2 kJ 0.4780114723 kcal (th)
3 kJ 0.7170172084 kcal (th)
5 kJ 1.1950286807 kcal (th)
10 kJ 2.3900573614 kcal (th)
20 kJ 4.7801147228 kcal (th)
50 kJ 11.9502868069 kcal (th)
100 kJ 23.9005736138 kcal (th)
1000 kJ 239.0057361377 kcal (th)
How to Convert Kilojoule to Kilocalorie (th)
1 kJ = 0.2390057361 kcal (th)
1 kcal (th) = 4.184 kJ
Example: convert 15 kJ to kcal (th):
15 kJ = 15 × 0.2390057361 kcal (th) = 3.5850860421 kcal (th)
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