Calories are a unit of measurement for energy. They are referring to the quantity of fuel in foods and beverages and the amount of energy you expend when exercising.
Energy may alternatively be measured in kilocalories (kcal) or kilojoules (kJ), depending on where you reside (kJ).
This might be perplexing, mainly if you’re calculating calories or comparing the calorie amounts of different meals and beverages.
This article defines calories and compares them to kcal and kJ, as well as how to convert between them.
Main differences
They might be “little” or “big” in terms of calories.
If the “c” in calories is capitalized, it denotes a large calorie; if it is lowercase, it means a tiny calorie.
A significant calorie is the amount of energy necessary to raise the temperature of one kilogram (2.2 pounds) of water by one degree Celsius (1.8 degrees Fahrenheit) (1).
A slight calorie, on the other hand, calculates the amount of energy required to raise the temperature of 1 gram (0.035 ounces) of water by one °C (or 1.8°F) (1).
According to these criteria, one significant calorie = 1,000 little calories, and one kilogram equals 1,000 grams.
To minimize misunderstanding between big and tiny calories, the term kilocalorie – the prefix “kilo” signifying 1,000 — is considered to have been coined to refer to a significant calorie (1).
However, outside of physics and chemical study, the phrase “tiny calorie” is rarely used nowadays.
Instead, the words calories (capitalized or not) and kcal are used interchangeably to refer to the same quantity of energy regarding food or energy burnt via activity.
As a result, there is no need to convert them because of 1 kilocalorie = 1 calorie in nutrition.
Kilojoules are another way to express calories (kJ).
A calorie (kcal) is equivalent to 4.18 kJ or 4,184 joules (J) (1).
To convert calories to kJ, multiply the number of calories by 4.18. To convert kJ to calories, divide kJ by 4.18.
A medium-sized banana (118 grams) has 105 calories (kcal) or 439 kJ. (2).
How are these terms used?
Food and beverage businesses are required by law to include a nutrition data label on their goods. It provides information such as the amount of energy in the food per serving or weight (3).
The nutrition information label informs you about the nutritional value of packaged foods and beverages. If they include components, you should avoid them due to an allergy, intolerance, or personal choice.
Depending on where you live, the energy content of a meal or beverage may be expressed in calories, kcal, kJ, or a mix of these units.
The following is a list of nations and the energy labels they employ (4, 5, 6, 7):
- United States: calories
- Canada: calories
- European Union (EU): kJ and kcal
- Australia and New Zealand: kJ or both kJ and kcal
- China: kJ
The quantity of calories in a meal or beverage is determined by the amount of energy-supplying nutrients it contains.
The three primary sources of energy are:
- protein
- carbs
- fats
Protein and carbohydrates each offer around four calories (16.7 kJ) per gram, whereas fat contributes approximately nine calories per gram (37.6 kJ) (9).
Alcohol has seven calories (29.3 kJ) per gram.
Manufacturers round to the closest 1-gram increment; thus, calculating the number of calories or kJ from each macronutrient may result in a slightly different total than the number indicated on the nutrition label (4).
Furthermore, the nutrition labels of foods containing fiber, a carbohydrate, may have fewer calories than you calculate.
This is because fiber is either indigestible or poorly digested, giving zero or few calories depending on the kind (10).
The bottom line
Calories are a unit of measurement for energy in both diet and exercise.
Calories and kcal are terms that refer to the same quantity of energy.
Calories, commonly known as kcal, can also be measured in kJ, with one calorie (kcal) equaling 4.18 kJ.
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