Basic Metabolc Rate (BMR):
This value is how many calories your body requires at a resting position.
Adult Female:
BMR = 665 + (4.3 x body weight in lbs.) + (4.7 x height in inches) - (4.7 x age in years)
Use your BMR to determine your daily caloric needs:
sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2
lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375
moderately active (moderate exercise/sports 3-5 days/week) : Calorie-Calculation = BMR x 1.55
very active (hard exercise/sports 6-7 days a week) : Calorie-Calculation = BMR x 1.725
extra active (very hard exercise/sports & physical job or 2x training) : Calorie-Calculation = BMR x 1.9
The above values are how many calories your body will require to maintain your current bodyweight at the specified level of activity. An increase in 500 calories per day over these specified values (3500 additional calories over the span of one week) will result in an increase in bodyweight by one pound (minimum). Conversely, a decrease by 500 calories will have the opposite effect. An increase or decrease in your level of activity will also have to be reflected in your nutritional intake.