Basal Metabolism
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Your basal metabolism represents the number of calories your body burns when at rest, but awake, over the course of one day. This number is one of the factors that determines your total calorie needs for the day.
EBSCO Information Services's proprietary interactive calculators provide general results based on input provided by the user that is calculated against measurements or formulas considered standard by various government agencies, including the USDA, CDC, and FDA. The inputted information consists only of single values (e.g., anthropometric data or activity levels) not detailed clinical information, and the results do not indicate or suggest a specific course of action unique to the user.
Sources:

Kcal calculator. University of Connecticut Health Center website. Available at: http://www-users.med.cornell.edu/~spon/picu/calc/beecalc.htm

Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (Macronutrients) (2002). The National Academies Press; 2002. Available at: http://books.nap.edu/books/0309085373/html/96.html#pagetop

Harris J, Benedict F. A biometric study of basal metabolism in man. Washington D.C.: Carnegie Institute of Washington; 1919.