Python Tkinter Unit Converter with Dark Mode and History
Enhance your productivity with this Python Tkinter Unit Converter. It supports conversions for both Length and Weight units, keeps track of the last 10 conversions, and features a modern dark mode toggle.
Key Features:
- Convert units of Length: meters, kilometers, miles, feet, inches, etc.
- Convert units of Weight: kilograms, grams, pounds, ounces, etc.
- Dark mode toggle for comfortable usage.
- Automatic history of last 10 conversions.
Full Source Code:
import sys
import os
import tkinter as tk
from tkinter import ttk, messagebox, scrolledtext
import sv_ttk
def resource_path(file_name):
"""Get the absolute path to a resource, works for PyInstaller."""
base_path = getattr(sys, "_MEIPASS", os.path.dirname(os.path.abspath(__file__)))
return os.path.join(base_path, file_name)
root = tk.Tk()
root.title("Unit Converter")
root.geometry("1100x800")
sv_ttk.set_theme("light")
dark_mode_var = tk.BooleanVar(value=False)
history_data = []
def set_status(msg):
status_var.set(msg)
root.update_idletasks()
def toggle_theme():
style.theme_use("clam")
if dark_mode_var.get():
root.configure(bg="#2E2E2E")
style.configure("TLabel", background="#2E2E2E", foreground="white")
style.configure("TFrame", background="#2E2E2E")
style.configure("TNotebook", background="#2E2E2E")
style.configure("TNotebook.Tab", background="#444444", foreground="white")
style.map("TNotebook.Tab", background=[("selected", "#90caf9")], foreground=[("selected", "black")])
else:
root.configure(bg="#FFFFFF")
style.configure("TLabel", background="#FFFFFF", foreground="black")
style.configure("TFrame", background="#FFFFFF")
style.configure("TNotebook", background="#FFFFFF")
style.configure("TNotebook.Tab", background="#e0e0e0", foreground="black")
style.map("TNotebook.Tab", background=[("selected", "#90caf9")], foreground=[("selected", "black")])
set_status(f"Theme switched to {'Dark' if dark_mode_var.get() else 'Light'} mode")
style = ttk.Style()
style.theme_use("clam")
style.configure("Action.TButton", font=("Segoe UI", 11, "bold"),
foreground="white", background="#4CAF50", padding=8)
style.map("Action.TButton", background=[("active", "#45a049"), ("disabled", "#a5d6a7")])
style.configure("TNotebook.Tab", padding=[10,5], font=("Segoe UI",11,"bold"), background="#e0e0e0")
style.map("TNotebook.Tab", background=[("selected","#90caf9")], foreground=[("selected","black")])
status_var = tk.StringVar(value="Ready")
ttk.Label(root, textvariable=status_var, anchor="w", font=("Segoe UI", 10)).pack(side=tk.BOTTOM, fill="x")
tabs = ttk.Notebook(root)
tabs.pack(expand=True, fill="both", padx=20, pady=20)
dash_tab = ttk.Frame(tabs, padding=20)
tabs.add(dash_tab, text="🏠 Dashboard")
ttk.Label(dash_tab, text="Unit Converter", font=("Segoe UI", 20, "bold")).pack(anchor="w")
ttk.Label(dash_tab, text="Convert between Length and Weight units quickly and accurately.", font=("Segoe UI", 11)).pack(anchor="w", pady=(5,10))
ttk.Label(dash_tab, text="Key Features:", font=("Segoe UI", 13, "bold")).pack(anchor="w", pady=(10,5))
features_frame = ttk.Frame(dash_tab)
features_frame.pack(fill="x", pady=5)
def create_feature_card(parent, title, desc):
card = ttk.LabelFrame(parent, text=title, padding=10)
ttk.Label(card, text=desc, wraplength=200, font=("Segoe UI", 10)).pack(anchor="w")
return card
create_feature_card(features_frame, "🧮 Length & Weight Conversion",
"Supports common units like meters, kilometers, miles, kilograms, pounds, and more.").grid(row=0, column=0, padx=10, pady=10, sticky="nsew")
create_feature_card(features_frame, "📊 Conversion History",
"Automatically keeps the last 10 conversions for quick reference.").grid(row=0, column=1, padx=10, pady=10, sticky="nsew")
create_feature_card(features_frame, "🎨 Dark Mode",
"Switch between light and dark themes for comfortable usage.").grid(row=0, column=2, padx=10, pady=10, sticky="nsew")
features_frame.columnconfigure((0,1,2), weight=1)
desc_frame = ttk.LabelFrame(dash_tab, text="About This Tool", padding=15)
desc_frame.pack(fill="x", pady=20)
ttk.Label(
desc_frame,
text=(
"Unit Converter is a simple yet powerful tool for converting values between different units of Length and Weight.\n\n"
"• Enter a numeric value and select units to convert.\n"
"• Supports meters, kilometers, centimeters, miles, yards, feet, inches, kilograms, grams, pounds, ounces, etc.\n"
"• Automatic history of last 10 conversions.\n"
"• Modern interface with light/dark mode.\n\n"
"🏢 Built with Python & Tkinter\n"
"🌐 Enhances productivity for engineers, students, and professionals."
),
wraplength=650,
justify="left",
font=("Segoe UI", 10)
).pack(anchor="w")
tool_tab = ttk.Frame(tabs, padding=20)
tabs.add(tool_tab, text="🔧 Converter")
length_units = {
"Meters": 1.0,
"Kilometers": 1000.0,
"Centimeters": 0.01,
"Millimeters": 0.001,
"Miles": 1609.34,
"Yards": 0.9144,
"Feet": 0.3048,
"Inches": 0.0254
}
weight_units = {
"Kilograms": 1.0,
"Grams": 0.001,
"Milligrams": 0.000001,
"Pounds": 0.453592,
"Ounces": 0.0283495
}
ttk.Label(tool_tab, text="Value to Convert:", font=("Segoe UI", 12)).pack(anchor="w", pady=5)
value_entry = ttk.Entry(tool_tab, font=("Segoe UI", 14))
value_entry.pack(fill="x", pady=5)
ttk.Label(tool_tab, text="Select Category:", font=("Segoe UI", 12)).pack(anchor="w", pady=5)
category_var = tk.StringVar(value="Length")
category_combo = ttk.Combobox(tool_tab, textvariable=category_var, state="readonly",
values=["Length", "Weight"], font=("Segoe UI", 12))
category_combo.pack(fill="x", pady=5)
ttk.Label(tool_tab, text="From Unit:", font=("Segoe UI", 12)).pack(anchor="w", pady=5)
from_unit_var = tk.StringVar(value="Meters")
from_combo = ttk.Combobox(tool_tab, textvariable=from_unit_var, state="readonly", font=("Segoe UI", 12))
from_combo.pack(fill="x", pady=5)
ttk.Label(tool_tab, text="To Unit:", font=("Segoe UI", 12)).pack(anchor="w", pady=5)
to_unit_var = tk.StringVar(value="Kilometers")
to_combo = ttk.Combobox(tool_tab, textvariable=to_unit_var, state="readonly", font=("Segoe UI", 12))
to_combo.pack(fill="x", pady=5)
result_var = tk.StringVar(value="")
ttk.Label(tool_tab, text="Result:", font=("Segoe UI", 12)).pack(anchor="w", pady=5)
ttk.Label(tool_tab, textvariable=result_var, font=("Segoe UI", 14, "bold")).pack(anchor="w", pady=5)
history_frame = ttk.LabelFrame(tool_tab, text="Conversion History (Last 10)", padding=10)
history_frame.pack(fill="both", expand=True, pady=10)
history_text = scrolledtext.ScrolledText(history_frame, height=6, font=("Consolas", 11), state="disabled")
history_text.pack(fill="both", expand=True)
def update_units(event=None):
if category_var.get() == "Length":
units = list(length_units.keys())
else:
units = list(weight_units.keys())
from_combo["values"] = units
to_combo["values"] = units
from_combo.set(units[0])
to_combo.set(units[1])
def convert_unit():
try:
value = float(value_entry.get())
if category_var.get() == "Length":
factor_from = length_units[from_unit_var.get()]
factor_to = length_units[to_unit_var.get()]
else:
factor_from = weight_units[from_unit_var.get()]
factor_to = weight_units[to_unit_var.get()]
result = value * factor_from / factor_to
result_var.set(f"{result:.6g}")
set_status(f"Converted {value} {from_unit_var.get()} to {result:.6g} {to_unit_var.get()}")
add_to_history(value, from_unit_var.get(), result, to_unit_var.get())
except ValueError:
messagebox.showerror("Error", "Please enter a valid number")
result_var.set("")
set_status("Error: Invalid input")
def add_to_history(value, from_unit, result, to_unit):
global history_data
entry = f"{value} {from_unit} → {result:.6g} {to_unit}"
history_data.insert(0, entry)
if len(history_data) > 10:
history_data = history_data[:10]
history_text.config(state="normal")
history_text.delete("1.0", tk.END)
history_text.insert(tk.END, "\n".join(history_data))
history_text.config(state="disabled")
category_combo.bind("<>", update_units)
ttk.Button(tool_tab, text="Convert", command=convert_unit, style="Action.TButton").pack(pady=10)
ttk.Checkbutton(root, text="Dark Mode", variable=dark_mode_var, command=toggle_theme).pack(side="bottom", pady=5)
update_units()
root.mainloop()
✅ Now you can run this script directly in Python. Make sure to install sv_ttk for modern themes using:
pip install sv_ttkDownload or Explore Useful Tools
Check out more useful tools and downloads here: MateTools on Gumroad
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