Body mass index (BMI) is a measure of body fat based on height and weight. The formula is BMI = kg/m2 where kg is a person’s weight in kilograms and m2 is their height in metres squared.

```
Height=float(input("Enter your height in centimeters: "))
Weight=float(input("Enter your Weight in Kg: "))
Height = Height/100
BMI=Weight/(Height*Height)
print("Your Body Mass Index is: ",BMI)
if(BMI<=18.5):
print("Oops! You are underweight.")
elif(BMI<=24.9):
print("Awesome! You are healthy.")
elif(BMI<=29.9):
print("You are overweight.")
else:
print("You are Obese. Start Exercise.")
```