Can you fix my BMI calculation?

Question

Hello there! I am very new to python and I have to do a BMI calculator but unfortunately there is something wrong with my code, it doesn't work. Can you please help me fix it?

weight:float(input(85.0/1.9))
if weight >=25:
print("Normal")
if weight < 18.5:
print("Underweight")
if weight > 25 or 30:
print("Overweight")
if weight > 30:
print("Obesity")
break

Answer 1

First of all I will explain you the working of bmi calculator, in this you have to input both height and weight and then formula of bmi is :- weight/(height*height).
Now in your program you should enter height. In line 1:- in python we use '=' in place of ':' and you should use elif and else also in your program and there is unnecessary indentation in your code remove that also.

Here's my code, Hope you'll understand!!

height = float(input('height in meters:'))
weight = int(input('weight in kg:'))
bmi = weight/(height*height)
if bmi <= 18.5:
print('underweight')
elif bmi > 18.5 and bmi < 25:
print('normal')
elif bmi > 25 and bmi < 30:
print('overweight')
elif bmi > 30:
print('obese')
else:
print('daya kuch to gadbad hai, XD')
print('Something is wrong')

Answer 2

Programmer269 I recommend you to repeat the tutorial and to study every little step carefully on the SL Playground.

Answer 3

There are quite many things you have to learn. The errors are fixed on your original code:

weight=float(input(85.0/1.9))
if weight >=25:
print("Normal")
if weight < 18.5:
print("Underweight")
if weight > 25 or 30:
print("Overweight")
if weight > 30:
print("Obesity")
#break

Answer 4

Programmer269 now also your code doesn't seems good, read my full comment hope you'll understand!!

Answer 5

var = ... # to do assignement

you should take weight and height as input (weight int, height float) and not hardcode them;

weigth = int(input())
height = float(input())

then you must compute bmi using inputs:

bmi = weight/height**2

and finally do if...elif...else with correction conditions, correct order, an correct indentation:

if bmi < 18.5:
print('Underweight')
elif bmi < 25:
print('Normal')
elif bmi < 30:
print('Overweight')
else:
print('Obesity')

'break' has nothing to do outside of a loop ^^

Answer 6

Oh, now I understand, I changed my code before you wrote this comment
weight=float(input(20))
if weight <=18.5 and 25:
print("Normal")
if weight > 18.5:
print("Underweight")
if weight < 25 and 30:
print("Overweight")
if weight < 30:
print("Obesity")
#break

And I didn't know what was going on, now I know. Thanks mate!

Answer 7

Pay attention to your indentation of your original post. Indentation changes the logic in Python.

Answer 8

Thank you!

Answer 9

I know, both of my code were false that's why I showed you because I saw that I missed a few things.

Answer 10

This is my code. I wish it will help you

#your code goes here
w=int(input())
h=float(input())
bmi=w/h**2
if bmi<18.5:
print("Underweight")
elif bmi<25:
print("Normal")
elif bmi<30:
print("Overweight")
else:
print("Obesity")

Answer 11

Programmer269,
Here is my code, hope it helps you!!
#your code goes here
weight = float(input())
height = float(input())
BMI = weight / (height**2)
if BMI < 18.5:
print("Underweight")
elif BMI >= 18.5 and BMI<25:
print("Normal")
elif BMI >= 25 and BMI < 30:
print("Overweight")
elif BMI > 30 :
print("Obesity")

Answer 12

weight = float(input())
height = float(input())

x = weight / ( height**2)

if (x < 18.5):
print("Underweight")
elif (x >= 18.5 and x < 25):
print("Normal")
elif (x >= 25 and x < 30):
print("Overweight")
elif (x >= 30):
print("Obesity")

Answer 13

Programmer269
Here is my code
May help you:

#your code goes here
weight = int(input());
height = float(input());
bmi = weight/float(height*height);
if bmi<18.5:
print('Underweight')
elif bmi>=18.5 and bmi<25:
print("Normal")
elif bmi>=25 and bmi<30:
print('Overweight')
else:
print('Obesity')

Answer 14

All the above explanations are wrong .