I'm a 16year old girl. I'm 171cm and weigh 57kg. Is that normal if not what should?

Your body mass index is 19.1, which means that you are currently at a normal weight. Your body mass index (BMI) is a measure of body fat based on height and weight.

BMI Categories: * Normal weight = 18.5-24.9 * Overweight = 25-29.9 * Obesity = BMI of 30 or greater Anything less than 18.5 means you are underweight.