BMI for 12-Year-Old Girls: Calculation & Healthy Weight Range

To calculate the body mass index (BMI) for a 12-year-old female who weighs 103 pounds, you can use the following formula:

BMI = weight (in kilograms) / (height (in meters))^2

First, convert the weight from pounds to kilograms:

103 pounds / 2.20462 pounds per kilogram = 46.7 kilograms

Next, estimate the height of a 12-year-old female using average growth charts. The average height for a 12-year-old female is approximately 5 feet or 1.524 meters.

Now, plug the weight and height values into the BMI formula:

BMI = 46.7 kg / (1.524 m)^2 = 20.2 kg/m^2

Therefore, the BMI for a 12-year-old female who weighs 103 pounds and is 5 feet tall is approximately 20.2 kg/m^2. For reference, the normal BMI range for children and adolescents aged 2 to 20 years is between the 5th and 85th percentiles on the CDC growth charts. It's always recommended to consult with a healthcare professional, such as a pediatrician or a registered dietitian, to assess your child's growth and development and determine if their BMI is within a healthy range.