📦 JP2US Shipping Calculator

A desktop app to fairly allocate international shipping costs from Japan to the US.
This tool is designed to help buyers who purchase multiple items online from Japan and ship them together using EMS.

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✨ Features

• 🧮 Hybrid cost allocation strategy:
  • Base fee (first 500g) is distributed by item value
  • Incremental fee (after 500g) is distributed by item weight
• 📦 Add items with name, weight, and price
• 📝 View, edit, delete items in a dynamic table
• 🚚 Choose EMS shipping zone
• 📊 Get per-item shipping breakdown and total cost
• 🛠 Edit EMS rate table (in-session only)
• 📤 Export results to CSV
• 🧹 Clear all items with one click
• 📎 Responsive layout with clean UI
• 📌 Packaged as a .exe for Windows — no install required!

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📥 Download

🪟 Download Windows exe

Just double-click to launch — no installation required.

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📸 Screenshots

Main UI	Allocation Results	EMS Rate Editor

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📂 Folder Structure

jp2us-shipcalc/ 
├── assets/ # App icons 
├── dist/ # Final packaged app (Windows .exe) 
├── src/ 
│ ├── main.py # Entry point 
│ ├── ui/ # UI components (app_ui, popups) 
│ ├── model/ # Business logic (shipping calc, rate tables) 
│ └── controller/ # App logic (item mgmt, UI control) 
└── README.md

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🚀 Packaging (for developers)

Build a Windows .exe with PyInstaller:

pip install pyinstaller
python -m PyInstaller --noconsole --onefile --icon=assets/favicon.ico src/main.py

Packaged .exe will be located in the dist/ folder.

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📌 Notes

• All EMS rate edits are in-session only (reset on app restart)
• Tested on Windows 10/11 with Python 3.10+

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🗺️ Future Roadmap

• macOS .app packaging
• DHL/other carrier support
• Save/load item lists (JSON)
• Currency conversion
• Chart-based cost breakdown