Python: Weight Conversion GUI using Tkinter (original) (raw)

Last Updated : 12 Jul, 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()

`

Output: