The Body Mass Index (BMI) scale is often used by doctors to determine if you are at a healthy weight for your height. BMI is accurate for most people but not all. It may overestimate body fat if you are muscular or athletic and report a high BMI. Likewise, if you have low muscle mass it may underestimate your body fat and report a low BMI.
This tool is not a substitute for talking to your doctor about weight-related health concerns. This test is meant for adult use. It is not accurate for children and teens.