Age Calculator using Tkinter

Creating an age calculator using Tkinter is a good exercise to understand the basics of GUI development along with some logical operations.

In this tutorial, you will learn how to build a simple age calculator that takes a user's birthdate and calculates their age.

1. Importing Required Modules:

import tkinter as tk
from tkinter import ttk
from datetime import datetime

2. Setting Up the Main Application Window:

root = tk.Tk()
root.title("Age Calculator")

3. Creating Input Fields:

You can use ttk.Entry widgets to get the date, month, and year of birth:

frame = ttk.LabelFrame(root, text="Enter your birthdate")
frame.pack(pady=20)

# Labels
ttk.Label(frame, text="Year").grid(row=0, column=0)
ttk.Label(frame, text="Month").grid(row=0, column=1)
ttk.Label(frame, text="Day").grid(row=0, column=2)

# Entry widgets
year_var = tk.StringVar()
month_var = tk.StringVar()
day_var = tk.StringVar()

year_entry = ttk.Entry(frame, textvariable=year_var, width=5)
month_entry = ttk.Entry(frame, textvariable=month_var, width=5)
day_entry = ttk.Entry(frame, textvariable=day_var, width=5)

year_entry.grid(row=1, column=0, padx=10, pady=10)
month_entry.grid(row=1, column=1, padx=10, pady=10)
day_entry.grid(row=1, column=2, padx=10, pady=10)

4. Age Calculation Logic:

To calculate age:

def calculate_age():
    today = datetime.now()
    birthdate = datetime(int(year_var.get()), int(month_var.get()), int(day_var.get()))
    age = today.year - birthdate.year - ((today.month, today.day) < (birthdate.month, birthdate.day))
    age_label.config(text=f"You are {age} years old!")

calculate_button = ttk.Button(root, text="Calculate Age", command=calculate_age)
calculate_button.pack(pady=20)

5. Displaying the Age:

Create a label to display the age:

age_label = ttk.Label(root, text="")
age_label.pack(pady=20)

6. Complete Application:

import tkinter as tk
from tkinter import ttk
from datetime import datetime

def calculate_age():
    today = datetime.now()
    birthdate = datetime(int(year_var.get()), int(month_var.get()), int(day_var.get()))
    age = today.year - birthdate.year - ((today.month, today.day) < (birthdate.month, birthdate.day))
    age_label.config(text=f"You are {age} years old!")

root = tk.Tk()
root.title("Age Calculator")

frame = ttk.LabelFrame(root, text="Enter your birthdate")
frame.pack(pady=20)

# Labels
ttk.Label(frame, text="Year").grid(row=0, column=0)
ttk.Label(frame, text="Month").grid(row=0, column=1)
ttk.Label(frame, text="Day").grid(row=0, column=2)

# Entry widgets
year_var = tk.StringVar()
month_var = tk.StringVar()
day_var = tk.StringVar()

year_entry = ttk.Entry(frame, textvariable=year_var, width=5)
month_entry = ttk.Entry(frame, textvariable=month_var, width=5)
day_entry = ttk.Entry(frame, textvariable=day_var, width=5)

year_entry.grid(row=1, column=0, padx=10, pady=10)
month_entry.grid(row=1, column=1, padx=10, pady=10)
day_entry.grid(row=1, column=2, padx=10, pady=10)

calculate_button = ttk.Button(root, text="Calculate Age", command=calculate_age)
calculate_button.pack(pady=20)

age_label = ttk.Label(root, text="")
age_label.pack(pady=20)

root.mainloop()

Now, running this code will provide you with a simple age calculator where you can input your birthdate and get your age.

Python Tkinter date of birth calculator example:

Description: Build a simple Tkinter GUI for calculating age from the date of birth.

Code Example:

import tkinter as tk
from datetime import datetime

def calculate_age():
    birth_date_str = entry_birth_date.get()
    try:
        birth_date = datetime.strptime(birth_date_str, "%Y-%m-%d")
        today = datetime.now()
        age = today.year - birth_date.year - ((today.month, today.day) < (birth_date.month, birth_date.day))
        label_result.config(text=f"Age: {age} years")
    except ValueError:
        label_result.config(text="Invalid date format")

root = tk.Tk()
root.title("Age Calculator")

label_instructions = tk.Label(root, text="Enter your date of birth (YYYY-MM-DD):")
label_instructions.pack(pady=10)

entry_birth_date = tk.Entry(root)
entry_birth_date.pack(pady=10)

button_calculate = tk.Button(root, text="Calculate Age", command=calculate_age)
button_calculate.pack(pady=10)

label_result = tk.Label(root, text="")
label_result.pack(pady=10)

root.mainloop()

Tkinter date picker for Age Calculator:

Description: Enhance the Age Calculator by adding a date picker for selecting the birthdate.

Code Example:

import tkinter as tk
from tkinter import ttk
from tkcalendar import DateEntry  # Install this module using: pip install tkcalendar

def calculate_age():
    birth_date = entry_birth_date.get_date()
    today = datetime.now()
    age = today.year - birth_date.year - ((today.month, today.day) < (birth_date.month, birth_date.day))
    label_result.config(text=f"Age: {age} years")

root = tk.Tk()
root.title("Age Calculator with Date Picker")

label_instructions = tk.Label(root, text="Select your date of birth:")
label_instructions.pack(pady=10)

entry_birth_date = DateEntry(root, width=12, background="darkblue", foreground="white", borderwidth=2)
entry_birth_date.pack(pady=10)

button_calculate = tk.Button(root, text="Calculate Age", command=calculate_age)
button_calculate.pack(pady=10)

label_result = tk.Label(root, text="")
label_result.pack(pady=10)

root.mainloop()

Age calculation with entry widgets in Tkinter:

Description: Demonstrate calculating age with entry widgets for date components.

Code Example:

import tkinter as tk
from datetime import datetime

def calculate_age():
    try:
        birth_year = int(entry_year.get())
        birth_month = int(entry_month.get())
        birth_day = int(entry_day.get())

        birth_date = datetime(birth_year, birth_month, birth_day)
        today = datetime.now()
        age = today.year - birth_date.year - ((today.month, today.day) < (birth_date.month, birth_date.day))
        label_result.config(text=f"Age: {age} years")
    except ValueError:
        label_result.config(text="Invalid date components")

root = tk.Tk()
root.title("Age Calculator with Entry Widgets")

label_instructions = tk.Label(root, text="Enter your date of birth:")
label_instructions.pack(pady=10)

entry_year = tk.Entry(root, width=4)
entry_year.pack(side=tk.LEFT, padx=5)

label_year = tk.Label(root, text="Year")
label_year.pack(side=tk.LEFT)

entry_month = tk.Entry(root, width=2)
entry_month.pack(side=tk.LEFT, padx=5)

label_month = tk.Label(root, text="Month")
label_month.pack(side=tk.LEFT)

entry_day = tk.Entry(root, width=2)
entry_day.pack(side=tk.LEFT, padx=5)

label_day = tk.Label(root, text="Day")
label_day.pack(side=tk.LEFT)

button_calculate = tk.Button(root, text="Calculate Age", command=calculate_age)
button_calculate.pack(pady=10)

label_result = tk.Label(root, text="")
label_result.pack(pady=10)

root.mainloop()