From the UCLA Student Health and Wellness Center:
RMR : There are many equations to estimate your total calorie needs based on your RMR and level of physical activity (NOTE: the thermic effect of food is usually not accounted for since its role is so minor). It is important to realize that all these equations are just estimates. You may need more or less depending on genetic differences in RMR and your body composition. Consult a qualified health professional for more information about your personal calorie needs.
Step 1: Estimate RMR
Men Healthy body weight x 11 calories
Women Healthy body weight x 10 calories
From Rice University :
First, basal metabolic calories (BMR kilocalories) can be approximately determined as body weight times 10 for women and body weight times 11 for men. This value is then multiplied by a factor for level of activity to determine activity kilocalories: 0.30 for inactive life styles to 0.75 for very active, strenuous lifestyles. Kilocalories needed for digestion are determined by adding BMR kilocalories + activity kilocalories and multiplying by 0.1.
Total kilocalories needed to maintain body weight are: BMR kilocalories + activity kilocalories + kilocalories needed for digestion
For example: Joanna weighs 123 pounds. To maintain her body weight under a strenuous regime of activity she needs BMR: 123 x 10= 1230 kcal + Activity kilocalories: 1230 x 0.75= 922.5 kcal + Digestion kilocalories: (1230+922.5) x 0.1= 215.25 kcal or a total of about 2367.75 kcal per day.
From Southern Illinois University
Basal Metabolism (BMR)
Energy required to maintain normal body functions while at rest
Energy to support: breathing, pumping blood, maintenance of body temperature, and other life-sustaining, ongoing functions
Ongoing functions account for 60 to 80% of a person's energy needs
To estimate calories for basal metabolism processes:
Men: Multiply body weight by 11
Women: Body weight x 10
From a Penn State Lecture "Digestion, Energy and Evaluation of Claims" :
Energy Out: Basal Metabolism
= minimum energy to live at rest
Men estimate: lbs body weight X 11
Women estimate: lbs body weight X 10
affected by
Muscle > Fat Male > Female
Young > Old Previous nutr. status
Temperature: body and environment
And just for the heck of it:
guideline
n 1 : guidance relative to setting standards or determining a course of action
2: a light line that is used in lettering to help align the letters
3: a rule or principle that provides guidance to appropriate behavior [syn: guidepost,
rule of thumb]
rule of thumb
n. pl. rules of thumb
A useful principle having wide application but not intended to be strictly accurate or reliable in every situation.
Nat