# Body Mass Index

We can measure our body fat by using Body Mass Index (BMI) value.

BMI = weight / (height * height)

Where,

Weight in kilograms,

height in meter.

Example:

Weight = 60 kg

Height = 1.7 m

BMI = 60 / (1.7 * 1.7)

BMI = 20.76

## Types

Based on the BMI value, we can categorize people into four following types

Under weight - BMI < 18.5 (less than 18.5)

Normal weight - 18.5 >= BMI <= 25 (greater than or equal to 18.5 and less than or equal to 25)

Over weight - 25 > BMI <= 30 (greater than 25 and less than or equal to 30)

Obese - BMI > 30 (greater than 30)

## Let's write a BMI calculator using C

The program will get weight and height from user and tell which type they belong based on the BMI value.

Example

/*
* Body Mass Index calculator *
* Language : C               *
*/

#include<stdio.h>

int main()
{
float weight,height,BMI;

scanf("%f%f",&weight,&height);

BMI = weight / (height * height);

// less than 18.5
if(BMI < 18.5)
printf("Under weight\n");
// greater than or equal to 18.5 and less than or equal to 25
else if(BMI >= 18.5 && BMI <= 25)
printf("Normal weight\n");
// greater than 25 and less than or equal to 30
else if(BMI > 25 && BMI <= 30)
printf("Over weight\n");
// greater than 30
else
printf("Obese\n");

return 0;
}