Body mass index is defined as the one’s body weight divided by the square of his or her height. This tool is widely use 
because of its ease of measurement and calculation of weight problems such underweight, overweight and obesity (wikipedia.org). The normal range for BMI is usually considered to be 20 – 25 kg/m2.
But, new research shows that there’s a better, more informative way to figure out if you are overweight. It is the waist-to-hip ratio, and all you require is a measuring tape. Measure your waist and hip with the tape, divide it and you have the ratio result. A healthy waist-to-hip ratio for woman is no more than 0.8, and 0.95 for man.
Though it remains controversial whether the BMI or the waist-to-hip ratio is better, still both tools give advantages in each particular purpose. It is you now to decide which tool will be your best choice for your personal aim. You can figure out if you are overweight or not by using the BMI calculator or waist-to-hip ratio.
(from several sources over the internet)
