A healthy weight for a woman who is 5 feet 5 inches tall ranges from 114 to 144 pounds, with a corresponding body mass index of 19 to 24. This range is considered normal by the American Cancer Society.
A woman of this height weighing from 150 to 174 pounds who has a BMI of 25 to 29 is considered overweight. The same woman weighing 180 to 210 pounds with a BMI of 30 to 35 is classified as obese, according to the ACS. BMI is calculated by taking an individual's weight in pounds and multiplying it by 703. Next, square her height in inches. For example, if she is 60 inches tall, multiply 60 by 60 to arrive at 3,600. Divide the first result by the second to arrive at the BMI.