Graphical User Interfaces (GUIs) make it easy to create interactive applications. Python's tkinter library allows you to build GUI applications quickly. In this guide, we'll explore how to create a Python Calculator GUI using tkinter. We'll provide sample code to demonstrate the process.


Before you start building a Python Calculator GUI, ensure you have the following prerequisites:

  • Python installed on your system.
  • Basic knowledge of Python programming.

Creating a Python Calculator GUI

Let's create a basic Python Calculator GUI using tkinter. In this example, we'll build a simple calculator with a graphical interface.

import tkinter as tk
# Function to update the display
def update_display(value):
current_value = display_var.get()
display_var.set(current_value + value)
# Function to perform the calculation
def calculate():
result = eval(display_var.get())
except Exception as e:
# Create the main application window
root = tk.Tk()
root.title("Python Calculator")
# Create a display entry widget
display_var = tk.StringVar()
display = tk.Entry(root, textvariable=display_var, font=("Arial", 20))
display.grid(row=0, column=0, columnspan=4)
# Create calculator buttons
buttons = [
'7', '8', '9', '/',
'4', '5', '6', '*',
'1', '2', '3', '-',
'0', 'C', '=', '+'
row, col = 1, 0
for button in buttons:
tk.Button(root, text=button, font=("Arial", 16), command=lambda b=button: update_display(b) if b != '=' else calculate()).grid(row=row, column=col)
col += 1
if col > 3:
col = 0
row += 1
# Run the tkinter main loop

Using the Calculator

After running the Python Calculator GUI code, you can use the graphical interface to perform calculations by clicking the buttons.


Building a Python Calculator GUI using tkinter is a practical example of GUI application development. You can expand this project by adding more advanced features, improving the user interface, and customizing the calculator.