The calculation for a waist to hip ratio follows current nutrition practice. Since it included with proprietary formulas that I used to design the Healthy Body Calculator®, I do not provide the formula.
Waist to Hip Ratio determines distribution of body fat. More body fat in the upper body (chest and waist) suggests increased health risk for elevated triglycerides, high blood pressure, stroke, longer time to conceive, heart disease or diabetes. More fat in the lower body (hips and thighs) suggests fat loss is difficult.
This tells you where most of your body fat is located. Apple shape (0.80 or greater) means your body fat is located above your waist which indicates a higher health risk for diabetes, heart disease, high blood pressure and some cancers. Pear shape (less than 0.80) means your body fat is located below your waist which indicates a lower health risk, but fat located in the lower half of the body may be harder to lose during weight loss.