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Calories are a measure of energy
Calories are the amount of energy in foods and beverages, or the amount of energy you burn exercising.
Energy is measured in Kilocalories (kcal) and kilojoules (kJ). If you're counting calories or comparing the calorie contents of foods, this can cause confusion.
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To convert from calories to kJ
One calorie (kcal) = 4.18 kJ
To convert from calories to kJ, multiply calories by 4.18.
For example, a medium-sized banana (118 grams) provides 105 calories (kcal). 105 x 4.18 = 439 kJ.
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1 kilocalorie = 1 calorie in nutrition
The term kilocalorie (kilo meaning 1,000) was created to refer to a large calorie. The term small calorie is only used in physics and chemistry research.
This means that with nutrition, the terms calories and kcal equal the same amount of energy (1 kilokalorie = 1 calorie in nutrition.)
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Small and large calories
Calories can be small or large.
- A large calorie estimates the amount of energy needed to raise the temperature of 1 kg (2.2 pounds) of water by 1°C (34°F).
- A small calorie estimates the amount of energy it takes to raise the temperature o...
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Small and large calories
Calories can be small or large.
- A large calorie estimates the amount of energy needed to raise the temperature of 1 kg (2.2 pounds) of water by 1°C (34°F).
- A small calorie estimates the amount of energy it takes to raise the temperature o...
Counting calories in food
The system for counting calories comes from chemist Wilbur Atwater. To find out how much energy we get from eating, he measured the nutritional value in food and subtracted the amount of energy left in people's bodily excretion.
His research resulted in the 4-9-4 r...
Calculating Calories
The energy value of any food is measured in calories, and the basal metabolic rate is the minimum amount of calorie count that is required when the body is at rest (Resting Energy Expenditure). Combining it with the energy one consumes while moving around or digesting food gives ...
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