The daily calories required to remain at the same weight are determined by several factors:

• Basal Metabolic Rate (BMR) or sometimes referred to as Resting Metabolic Rate (RMR) is calculated by the Harris-Benedict formula using sex, weight, height and age. BMR is essentially the number of calories the body consumes per day in a state of rest or non-activity

• Lean and muscular, average or overweight. The Harris-Benedict formula works well for average weight individuals but will underestimate the number of calories needed for individuals who are lean and muscular and overestimate the calories needed by people who are significantly overweight

• And finally level of activity

Weight in pounds:
Height:	ft inches
Age in years:
Gender:	Male Female
Body Type:	Very Lean/Muscular About Average Significantly Overweight
Activity Level:	Sedentary - little or no exercise Lightly Active - light exercise 1-3 days/week Moderately Active - moderate exercise 3-5 days/week Very Active - considerable exercise 6-7 days/week Extremely Active - very hard daily exercise & physical occupation