##### What is BMI?

##### BMI means Body Mass Index.

Body Mass Index (BMI) is one method used to guess total body fat a person has. There are many methods of calculating body weight. The most accepted one is measuring one’s body mass index. It is an important screening tool that tells whether you are obese, overweight, underweight, or healthy.

The Body Mass Index is a method that uses the height and weight to measure the amount of fat that is normal for a person to perform his daily activities. It is calculated by dividing a person's weight in kilograms by the square of the person's height in meters. [BMI= Weight (kg)/ Height2 (m2)].

The classification of BMI goes as:

- BMI of less than 18.5 is considered underweight
- BMI in-between 18.5 – 24.9 is considered normal weight
- BMI in-between 25.0 – 29.9 is considered overweight
- BMI in-between 30.0 – 34.9 is considered class I obesity
- BMI in-between 35.0 – 39.9 is considered class II obesity
- BMI of more than 40.0 is considered class III obesity

There are two formulas or ways where you can use to calculate your body mass index manually: The metric version and the imperial (English) version. They will anyhow give you the similar results, but the methods are different.

The two formulas are:

- Metric Version: Weight (kg) / (Height (m) x Height (m)) = BMI Number
- Imperial Version: Weight (lbs) / (Height (in) x Height (in)) x 703 = BMI Number

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