To obtain the body mass index (BMI) using a bed scale, divide the weight value (in kilograms) by the height squared (in metres). Note that the BMI classification is designed for adults – it does not apply to children.
There are a number of reasons why you should monitor your BMI. These include health reasons, such as type II diabetes, atherosclerosis or risk of heart attack, and preventive reasons, such as a weight loss diet or simply looking after your health.