Weight Conversion GUI using Tkinter

Creating a Weight Conversion GUI using Tkinter is a good exercise to understand the basics of GUI development. Here's a simple tutorial to build a weight conversion application that converts between kilograms, grams, pounds, and ounces.

1. Initial Setup:

Start by importing the required modules and setting up the main window:

import tkinter as tk
from tkinter import ttk

root = tk.Tk()
root.title("Weight Converter")
root.geometry("400x300")

2. Define the Conversion Function:

def convert_weight():
    # Get the input value and the conversion units
    try:
        weight = float(weight_entry.get())
        from_unit = from_combobox.get()
        to_unit = to_combobox.get()
        
        # Conversion to base unit (kilogram)
        if from_unit == "Pounds":
            weight = weight / 2.20462
        elif from_unit == "Ounces":
            weight = weight / 35.274
        elif from_unit == "Grams":
            weight = weight / 1000

        # Conversion from base unit to target unit
        if to_unit == "Pounds":
            weight = weight * 2.20462
        elif to_unit == "Ounces":
            weight = weight * 35.274
        elif to_unit == "Grams":
            weight = weight * 1000

        # Display the result
        result_label.config(text=f"Converted Weight: {weight:.2f} {to_unit}")

    except ValueError:
        result_label.config(text="Invalid input. Please enter a number.")

3. Create Widgets:

Weight Entry and Labels:

frame_input = ttk.Frame(root)
frame_input.pack(pady=20)

label = ttk.Label(frame_input, text="Enter Weight:")
label.grid(row=0, column=0, padx=10)

weight_entry = ttk.Entry(frame_input)
weight_entry.grid(row=0, column=1, padx=10)
weight_entry.insert(0, "0")

Dropdowns for Unit Selection:

units = ["Kilograms", "Grams", "Pounds", "Ounces"]

from_combobox = ttk.Combobox(frame_input, values=units, width=10)
from_combobox.grid(row=1, column=0, padx=10, pady=10)
from_combobox.set("Kilograms")

to_label = ttk.Label(frame_input, text="to")
to_label.grid(row=1, column=1)

to_combobox = ttk.Combobox(frame_input, values=units, width=10)
to_combobox.grid(row=1, column=2, padx=10, pady=10)
to_combobox.set("Pounds")

Button for Conversion:

convert_btn = ttk.Button(root, text="Convert", command=convert_weight)
convert_btn.pack(pady=20)

Label for Displaying Result:

result_label = ttk.Label(root, text="Converted Weight: -")
result_label.pack(pady=20)

4. Main Loop:

root.mainloop()

When you piece all the code snippets together and run the script, you'll have a functional Weight Conversion GUI application using Tkinter. The user can input a weight, select the input and output units, and get the converted weight.

import tkinter as tk

def convert_weight():
    try:
        # Get input weight from the entry widget
        input_weight = float(entry.get())
        
        # Conversion rates (example: kg to pounds)
        kg_to_pounds = 2.20462
        result = input_weight * kg_to_pounds

        # Update the result label
        result_label.config(text=f"{input_weight} kg is {result:.2f} pounds")
    except ValueError:
        result_label.config(text="Invalid input, please enter a number")

# Create main window
root = tk.Tk()
root.title("Weight Converter")

# Entry widget for weight input
entry = tk.Entry(root, width=30)
entry.grid(row=0, column=0, padx=10, pady=10)

# Convert button
convert_button = tk.Button(root, text="Convert", command=convert_weight)
convert_button.grid(row=0, column=1, padx=5, pady=10)

# Result label
result_label = tk.Label(root, text="")
result_label.grid(row=1, column=0, columnspan=2, padx=10, pady=10)

# Start the Tkinter event loop
root.mainloop()

This is similar to the first example.

This is also similar to the first example.

The first example covers the basics of building a simple weight conversion app.

import tkinter as tk

def convert_weight():
    try:
        input_weight = float(entry.get())
        selected_unit = unit_var.get()

        # Conversion rates for different units
        unit_conversion = {
            "Kilograms to Pounds": 2.20462,
            "Pounds to Kilograms": 0.453592,
            # Add more units as needed
        }

        result = input_weight * unit_conversion[selected_unit]

        result_label.config(text=f"{input_weight} {selected_unit.split(' to ')[0]} is {result:.2f} {selected_unit.split(' to ')[1]}")
    except ValueError:
        result_label.config(text="Invalid input, please enter a number")

# Create main window
root = tk.Tk()
root.title("Weight Converter")

# Entry widget for weight input
entry = tk.Entry(root, width=30)
entry.grid(row=0, column=0, padx=10, pady=10)

# Dropdown menu for selecting weight units
units = ["Kilograms to Pounds", "Pounds to Kilograms"]
unit_var = tk.StringVar(root)
unit_var.set(units[0])
unit_dropdown = tk.OptionMenu(root, unit_var, *units)
unit_dropdown.grid(row=0, column=1, padx=5, pady=10)

# Convert button
convert_button = tk.Button(root, text="Convert", command=convert_weight)
convert_button.grid(row=0, column=2, padx=5, pady=10)

# Result label
result_label = tk.Label(root, text="")
result_label.grid(row=1, column=0, columnspan=3, padx=10, pady=10)

# Start the Tkinter event loop
root.mainloop()

This is similar to the fifth example.

The first example serves as a guide for creating a GUI weight converter.

This can be considered as a project example with the first code snippet.