Python: Weight Conversion GUI using Tkinter

Last Updated : 25 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 tkinterimport *
 
 
# 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()