The calories you need per day depend on your age, size and physical activity level. Women also burn fewer calories than men, according to the United States Department of Agriculture.
Variance
The calories a woman needs per day vary considerably. The older you are, the fewer calories you burn. The more you weigh, the more calories you burn. The more active you are, the more calories you burn.
Examples
A 20-year-old, 5-foot 4-inch 140-lb. sedentary female burns 1,750 calories per day, according to MayoClinic.com. If she were 60 years old, she would burn 1,550 calories. A 40-year-old, 5-foot 4-inch 140 lb. inactive female burns 1,650 calories per day, but if she were extremely active, she would burn 2,300 calories a day.
Factors
The calories you burn per day are determined by your basal metabolic rate, your level of physical activity and the energy you expend during food processing. Your basal metabolic rate, or the calories your body burns performing basic functions, accounts for about 60 to 75 percent of the calories you burn every day, according to MayoClinic.com.
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