app.py

import streamlit as st

st.title("BMI Calculator App")

# Input weight
weight = st.number_input("Enter your weight (in kgs)", min_value=0.0, step=0.1)

# Select height format
status = st.radio('Select your height format:', ('cms', 'meters', 'feet'))

# Input height based on selection
height = 0
if status == 'cms':
    height = st.number_input('Enter height in Centimeters', min_value=0.0, step=0.1)
    height /= 100  # Convert to meters
elif status == 'meters':
    height = st.number_input('Enter height in Meters', min_value=0.0, step=0.01)
elif status == 'feet':
    height = st.number_input('Enter height in Feet', min_value=0.0, step=0.1)
    height /= 3.281  # Convert to meters

# BMI Calculation and Display
if st.button('Calculate BMI'):
    if height > 0:
        bmi = weight / (height ** 2)
        st.text(f"Your BMI Index is {bmi:.2f}.")

        # Categorizing BMI
        if bmi < 16:
            st.error("You are Extremely Underweight")
        elif 16 <= bmi < 18.5:
            st.warning("You are Underweight")
        elif 18.5 <= bmi < 25:
            st.success("You are Healthy")
        elif 25 <= bmi < 30:
            st.warning("You are Overweight")
        else:
            st.error("You are Extremely Overweight")
    else:
        st.error("Please enter a valid height greater than 0.")