Body Mass Index (BMI)
Calculated from your height and weight, BMI is a fairly reliable indicator of body fat and can help assess risk for chronic disease. While age, sex, body type and race all play a part in fully determining health risk, they are not used to calculate BMI and thus this metric is best used as a guide when considered aside other metrics.
Waist to Height Ratio (WHtR)
Abdominal fat has been shown to be more stressful on the heart than fat located on other areas of the body, such as the hips, thighs, or arms. This type of fat is able to stimulate hormone production and inflammatory agents within the body. For this reason, WHtR is measured to not only assess weight health, but also cardiovascular health.