BMI or Body mass index is a ratio between the weight and height of a person. It is the measurement of the body shape and fitness condition. The total weight (in kg) of a person is divided by the square of his height (Meter). This ratio shows either a person is overweight, underweight or has a normal weight. It is the indicator of thinness or obesity. In other words it shows the amount of fat with relation to your general body condition. It is also known as Quetelet Index. The bmi is calculated with this formula,
BMI = Mass (Kg)/Height (Meters squares)
Suppose the weight of a person is 60 kg and his height 1.5 meters, his BMI will be calculated as under
BMI = 60/1.5×1.5 = 60/2.25 = 26.6kg/m². The bmi of the person is 26.6 and this one will be counted as a little overweight.
According to this formula the BMI is directly proportional to mass and inversely proportional to height. In simple words you can say that the BMI increases with the increase in weight and decreases with the decrease in weight. But as concerned to height it is opposite. When the height increases, the bmi decreases and when the height decreases the bmi increases.
The body mass index ratio is exercised worldwide by the health care providers. With the continuous record of bmi, they easily find the trend of the person’s body; either he is getting or losing fat. The numeric values of bmi make the matter easy without any further tests. Only the weight measurement cannot provide the obesity forecast. As the weight increases with the increase in height and that is not every time the fatness. As the body mass index includes height factor, the physicians may easily detect if the weight is coming more with respect to general body structure.
The experts have classified the bmi ratios to indicate the obesity or thinness. They specified a particular ratio to a particular health conditions. The chart is given on our BMI Calculator Page. For convenience it is mentioned here too.
The BMI Range Category by Weight
Lower than 16 strictly underweight
From 16 to 18 Underweight
From 18 to 25 Normal (Healthy weight)
From 25 to 30 Overweight
More than 30 strictly overweight
This is a general range chart. The bmi range may be a little different for different ages. The growing child shows no more different values than that of an adult person. Similarly different countries have different range for the term healthy or to be obese.
Risks of Having High BMI Value
As the bmi indicates the weight or fat ratio, it indirectly indicates the risk of a disease or a disorder. An obese or overweight person may be at risk of many diseases. The major possibilities are following.
1. Sickness of gallbladder
2. Coronary heart disease
3. Some kinds of cancer
4. High blood pressure – Hypertension
5. Sleep disorders
6. Heart problems – including heart stroke
7. OA – Osteoarthritis – A joint pain disorder
8. Dyslipidemia – Especially high or low LDL cholesterol
9. Coronary heart disease
10. Breathing problems
11. Diabetes (especially of type 2)
12. Your Kidneys May Not Work Properly – A new Research
The body mass index method was not invented to calculate obesity. In 1972 a publication turned it to calculate the fatness and now-a-days it is the most familiar and a simple method to know the obesity risk. The bmi is not the only method to calculate obesity. There are many other techniques like body volume index and Ponderal index etc. But the bmi is the most common, useful quick and authentic way, if some best BMI calculator is used.