To determine a healthy weight range for a given person, use a weight chart that provides an optimal weight range based on gender and height. Alternatively, calculate the person's Body Mass Index, or BMI, to determine how much body fat the person has.
A weight-height chart reflects the average weight range for people of different heights. Females and males have different weight ranges even if they are the same height.
To calculate Body Mass Index, measure the person's height and weight. The formula is as follows: weight in pounds multiplied by 703, divided by the square of the height in inches (W X 703) / (H x 2).