Nutritional calories
The nutritional calorie (C) is the amount of heat it takes to raise 1 kg (1000 g) of water by 1 °C.
You may be more familiar with kilojoules as a measure of energy from food.
4.184 kilojoules = 1 Calorie (C)
*note the capitalization of Calorie (C).
On average, a person needs 1500 to 2000 Calorie (6200-8700 kilojoules) per day to sustain (or carry out) daily activities. The total number of nutritional calories needed by one person is dependent on their body mass, age, height, gender, activity level, and the amount of exercise per day.
Average calories per meal:
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For women: 450 - 750 Calories
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For men: 650 - 850 Calories
Read more:
References:
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OpenStax College, Biology OpenStax CNX. 30 May 2015
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Rolfes,S. Understanding normal and clinical nutrition 8th ed. Wadsworth, Cengage Learning,