# Program to Calculate Body Mass Index (BMI)

• Difficulty Level : Medium
• Last Updated : 29 May, 2021

The Body Mass Index (BMI) or Quetelet index is a value derived from the mass (weight) and height of an individual, male or female. The BMI is defined as the body mass divided by the square of the body height and is universally expressed in units of kg/m2, resulting from the mass in kilograms and height in meters. The formula is:

```BMI = (mass or weight)/(height*height)
where,
mass or weight is in Kg,
height is in meters```

Examples:

```Input : height(in meter): 1.79832
weight(in Kg): 70
Output : The BMI is 21.64532402096181, so Healthy.
Explanation : 70/(1.79832*1.79832)

Input : height(in meter): 1.58496
weight(in Kg): 85
Output : The BMI is 33.836256857260594 so Suffering from Obesity
Explanation : 70/(1.58496*1.58496)```

## Python3

 `#Python program to illustrate``# how to calculate BMI``def` `BMI(height, weight):``    ``bmi ``=` `weight``/``(height``*``*``2``)``    ``return` `bmi` `# Driver code``height ``=` `1.79832``weight ``=` `70` `# calling the BMI function``bmi ``=` `BMI(height, weight)``print``(``"The BMI is"``, ``format``(bmi), ``"so "``, end``=``'')` `# Conditions to find out BMI category``if` `(bmi < ``18.5``):``    ``print``(``"underweight"``)` `elif` `( bmi >``=` `18.5` `and` `bmi < ``24.9``):``    ``print``(``"Healthy"``)` `elif` `( bmi >``=` `24.9` `and` `bmi < ``30``):``    ``print``(``"overweight"``)` `elif` `( bmi >``=``30``):``    ``print``(``"Suffering from Obesity"``)`

Output:

`The BMI is 21.64532402096181 so Healthy`

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