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# How to calculate BMI?

##### How to calculate BMI?

##### BMI is a measurement index for the human body.

BMI stands for body mass index, also officially known as Quetelet index. It was developed by Adolphe Quetelet, a Belgian polymath. It was formulated between the years of 1830 and 1850, while Quetelet was working on developing "social physics."

BMI is calculated by dividing a person’s body mass by the square of their height.

**Essentially, BMI (kg/m ^{2}) = weight (in kg) / (height (in meters))^{2}**

Or,

**BMI (lb/ft ^{2}) = (weight (in lb) / (height (in feet and inches))^{2}) x 703**

There are a few methods of calculating your BMI.

First is to do it manually, which is to take your weight and height and plug them into the formula above. However, remember to use the right formula, depending on whether you are calculating your weight and height in the metric system or the imperial system.

In order to manually calculate the BMI, first multiply your height by itself, and then divide your weight by this number. If you are working in metric, then this is your BMI. However, if you are working in imperial, then multiply the number you got by 703. The 703 is the conversion ratio of metric to imperial units.

However, if you prefer not to do the math yourself, there are various online tools available that will calculate the BMI for you, once you input your measurements in it.

Additionally, there are also BMI charts available that list the appropriate BMI for each person, depending on their height and weight.

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

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