The full meaning of BMI is Body Mass Index, which helps to show the total fat content in the human body. Body fat indicates the real amount of fat in the body, and its distribution as well as a crucial way of determining the healthiness of the body, either one is overweight or obese. To obtain the Body Mass Index (BMI) of a body, all you have to do is to divide the weight of a person's body by the height of that body.
BMI is generally calculated in percentages. However, if your BMI is less than 5 percent, you are considered underweight, while you will be considered overweight if your BMI is higher than 95 percent.
Body fat is quite essential for your body, and it forms about 4 percent of your body weight. Body fat is needed for your body organ to function well; too little or too much of it can be considered unhealthy. The appropriation in the fat of a body is determined by age and gender.