Thanks for writing in.
With weight of 91 lbs, your BMI is normal for most adults. If you are woman who is conscious about your weight and want to make sure your weight is at a healthy level, you should be informed about the body mass index
for a female. While this is not a set number for everyone, there are ways to know your specific target and what it all means. The Body Mass Index (BMI) is a calculation, based on your height and weight as to the amount of fat on your body.
Height has a direct effect on BMI because the taller you are, the more mass you will have. Since there is more mass, the ratio result of body fat will be different than someone who is shorter. Ideal BMI is 18.5 - 24.9.
How To Calculate Your BMI
This is the forumla, in the imperial system for BMI calculation:This is the formula in the metric system:
BMI = ( kg/m² ) weight in kilograms
height in meters²
Hope this helps