If you are 13 and weigh 85 pounds and you are 5'1'' how many calories should you eat a day?

A 5'1" female should weigh about 105-140 lbs, depending on her frame. 85 lbs is quite underweight on any frame About what he/she is eating now. Don't worry about the number of calories, just eat a well balanced diet with lots of protein (for growth), carbohydrates (for energy) fruit and vegetables, (for vitamins and minerals)