What is the ideal body weight and body mass index for a 5' 7 25 year old female?

Weight: An ideal body weight for a 5'7" woman is anywhere between 120-160 lbs, depending on size frame. If you have a small frame, you should be about 120-140 lbs. If you have a medium frame, you should be about 130-150 lbs. If you have a large frame, you should be about 140-160 lbs. BMI: On average, a healthy BMI is from 19-25. Underweight is less than 19, and overweight is more than 25.