The calories you burn per day depend on your age, gender, size and activity level. A 40-year-old 5'4" inactive woman who weighs 150-lb burns about 1,700 calories a day, according to MayoClinic.com.
Considerations
You burn more calories if you're more active. A 40-year-old 5'4" inactive woman who weighs 150 lb burns about 1,700 calories a day, but if she increases her physical activity to include 30 minutes of moderate activity most days of the week, she will burn 2,050 calories. Men burn more calories than women. You also burn fewer calories as you get older.
Factors
Calorie burn each day is based on three factors. Your body needs energy to perform basic functions like breathing, circulating blood and controlling body temperature, according to the National Institutes of Health. The number of calories your body uses to perform basic functions is called basal metabolic rate, or BMR. BMR accounts for 60 to 75 percent of the calories you burn each day, according to MayoClinic.com. Food processing and physical activity account for the rest of the calories your body burns each day.
Recommendations
To maintain your weight, you will need to consume the same number of calories as you burn, on average. Keep a food journal for a few days to determine how many calories you're typically consuming. If you're eating more than you need, you could be on the path to weight gain.
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