Waist to height ratio is the most accurate and efficient indicator of your risks for obesity, heart disease, diabetes, stroke, and hypertension. It is obtained by dividing waist size by height. It’s easier to calculate than BMI, and it works for any race, age, or gender. You don’t even need to have a measuring tape handy to use it. With a piece of string, a person can measure their height, then fold the string in half and check to see whether it fits around their waist. Keep your waist to less than half your height.” That means someone who is 5 foot 5 (65 inches; 167.64 centimeters) should maintain a waistline smaller than 33 inches or 84 centimeters. A person who is six feet tall (72 inches; 182 centimeters) should keep his or her waist below a trim 36 inches or 91 centimeters.
How to measure waist-height ratio
Place the tape measure directly on your skin
Measure your waist by placing the tape horizontally halfway between your lowest rib and the top of your hipbone
Breathe out normally and take the measurement.
Hold the tape lightly so as to not compress your skin
Measure your correct height by standing erect.