To determine the number of calories you need daily, determine your weight
in kilograms; if you know your weight
in pounds, divide it by
2.2. Then multiply your weight in kilograms by the basal metabolic rate (BMR) for females, which is 0.9, according to the University of Minnesota. This determines the amount of calories you need per hour. Multiply the total by 24 to get your estimated total daily calorie intake.