BMI-CALCULATOR

import tkinter as tk from tkinter import messagebox

def calculate_bmi(): try: weight = float(weight_entry.get()) height = float(height_entry.get())

    if weight <= 0 or height <= 0:
        messagebox.showerror("Input Error", "Weight and height must be positive numbers.")
        return
    
    bmi = weight / (height ** 2)
    category = classify_bmi(bmi)
    
    result_label.config(text=f"Your BMI is: {bmi:.2f}\nCategory: {category}")

except ValueError:
    messagebox.showerror("Input Error", "Please enter valid numeric values.")

def classify_bmi(bmi): """Classify BMI into categories""" if bmi < 18.5: return "Underweight" elif 18.5 <= bmi < 24.9: return "Normal weight" elif 25 <= bmi < 29.9: return "Overweight" else: return "Obesity"

Create the main window

root = tk.Tk() root.title("BMI Calculator")

Create and place the labels and entry fields

tk.Label(root, text="Weight (kg):").grid(row=0, column=0) weight_entry = tk.Entry(root) weight_entry.grid(row=0, column=1)

tk.Label(root, text="Height (m):").grid(row=1, column=0) height_entry = tk.Entry(root) height_entry.grid(row=1, column=1)

Create and place the calculate button

calculate_button = tk.Button(root, text="Calculate BMI", command=calculate_bmi) calculate_button.grid(row=2, columnspan=2)

Create and place the result label

result_label = tk.Label(root, text="") result_label.grid(row=3, columnspan=2)

Start the GUI event loop

root.mainloop()