Python: Weight Conversion GUI using Tkinter

Last Updated : 28 Apr, 2025

Prerequisites: Python GUI – tkinter
Python offers multiple options for developing a GUI (Graphical User Interface). Out of all the GUI methods, Tkinter is the most commonly used method. It is a standard Python interface to the Tk GUI toolkit shipped with Python. Python with Tkinter outputs the fastest and easiest way to create GUI applications. Creating a GUI using Tkinter is an easy task.

Steps to Create a Tkinter:

Importing the module – tkinter
Create the main window (container)
Add any number of widgets to the main window
Apply the event Trigger on the widgets.

Below is what the GUI looks like:

Let's create a GUI based weight converter that accepts a kilogram input value and converts that value to grams, pounds, and ounces when the user clicks the Convert button.

Below is the implementation.

Python3

# Python program to  create a simple GUI  
# weight converter using Tkinter 


from tkinter import *


# Create a GUI window
window = Tk()
 
# Function to convert weight
# given in kg to grams, pounds
# and ounces
def from_kg():
    
    # convert kg to gram
    gram = float(e2_value.get())*1000
    
    # convert kg to pound
    pound = float(e2_value.get())*2.20462 
    
    # convert kg to ounce
    ounce = float(e2_value.get())*35.274 
    
    # Enters the converted weight to 
    # the text widget
    t1.delete("1.0", END)
    t1.insert(END,gram)
    
    t2.delete("1.0", END)
    t2.insert(END,pound)
    
    t3.delete("1.0", END)
    t3.insert(END,ounce)

# Create the Label widgets
e1 = Label(window, text = "Enter the weight in Kg")
e2_value = StringVar()
e2 = Entry(window, textvariable = e2_value)
e3 = Label(window, text = 'Gram')
e4 = Label(window, text = 'Pounds')
e5 = Label(window, text = 'Ounce')

# Create the Text Widgets
t1 = Text(window, height = 1, width = 20)
t2 = Text(window, height = 1, width = 20)
t3 = Text(window, height = 1, width = 20)

# Create the Button Widget
b1 = Button(window, text = "Convert", command = from_kg)

# grid method is used for placing 
# the widgets at respective positions 
# in table like structure
e1.grid(row = 0, column = 0)
e2.grid(row = 0, column = 1)
e3.grid(row = 1, column = 0)
e4.grid(row = 1, column = 1)
e5.grid(row = 1, column = 2)
t1.grid(row = 2, column = 0)
t2.grid(row = 2, column = 1)
t3.grid(row = 2, column = 2)
b1.grid(row = 0, column = 2)

# Start the GUI 
window.mainloop()