# 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; printf("Enter your weight(kg) and height(meter)\n"); scanf("%f%f",&weight,&height); BMI = weight / (height * height); printf("Your BMI = %f\n",BMI); // 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; }