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Body Mass Index Calculator


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The Body Mass Index (BMI) Calculator helps you calculate the amount of fat in your body on the basis of your height and weight. This tool is quite beneficial for most of the adults over the age of 20. Whereas for children aged 2 and above, the amount of body fat can be assessed with the help of the BMI percentile.

The BMI tool plays an important role in determining if the person is healthy or not. It helps to know if the person is prone to any significant risks to his health. That is, if the values are not within the normal range, one needs to keep a close eye on his health. Age or gender of a person is not taken into consideration here.

The values differ from person to person as the body proportions are the main criteria for the tool. However, they provide near-perfect results and aid in the continuous monitoring of one's health.


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How to calculate BMI?


Imperial Body Mass Index (BMI) Formula: Body Mass Index is measured using pounds and inches with this given equation:

BMI = (weight in pounds/(height in inches x height in inches)) x 703

The height in inches is first multiplied by itself (squared). The weight in pounds is then divided by the result (square of height in inches). This gross result is again multiplied by 703 to arrive at the final result which is nothing but the BMI. This is called the Imperial BMI Formula.
Metric Body Mass Index (BMI) Formula: Body Mass Index is measured using kilograms and meters with this given equation:

BMI = (weight in kilograms/(height in meters x height in meters)).

The height in meters is first multiplied by itself (squared). Then the weight in kilograms is divided by the result (square of height in meters). The final outcome is the BMI in Kg/m2. If the height is available in centimeters, it is divided by 100 to obtain the height in meters. This is called the Metric BMI Formula.

BMI categories


The standard weight status categories associated with BMI ranges are shown in the following table:

Body Mass Index (BMI) Weight Status
less than 18.5 Under Weight
18.5 - 24.9 Normal Weight
25 - 29.9 Over Weight
30 - 34.9 Class I Obese
35 - 39.9 Class II Obese
40 upwards Class III Obese