Adding Calculator Pro is a specialized Merchant Calculator designed for mobile devices. It allows for high-speed tallying of long lists with total accuracy, featuring a paper-tape style history and essential utility tools.
- Merchant-Grade Tallying: Keeps a persistent running history of every calculation, perfect for summing up daily totals or inventory.
- Live Grand Total: A real-time summation of all rows is always visible at the bottom.
- Smart Gestures:
- Swipe Right to Edit: Made a mistake? Swipe right on a history row to bring the number back into the input field for correction.
- Swipe Left to Delete: Remove individual entries quickly.
- 🇮🇳 Indian Number System: Numbers are automatically formatted for easy reading (e.g.,
1,00,000.00). - 📏 Unit Converter: A built-in tool to handle basic conversions (Length, Area, Weight, etc.) without leaving the app.
- Session Archive: Never lose your data. The app stores your last 20 cleared sessions for easy restoration.
- Offline PWA: Works flawlessly without an internet connection.
| Action | Control |
|---|---|
| Open Converter | Tap the Ruler (📏) icon in the top action bar. |
| Edit Row | Swipe Right on any history row. |
| Delete Row | Swipe Left on any history row. |
| Expand Details | Tap on a row to view the full equation if it's too long. |
| Quick Clear Input | Long press the Backspace (⌫) button. |
| Inline Result | Long Press Equals (↵ =) to calculate within the input line for continued expressions. |
| Save & Reset | Tap the AC button to archive the current list and start fresh. |
| Copy Summary | Tap the Copy icon to copy the entire list to your clipboard. |
This app is designed to be installed on your phone for the best experience.
Android (Chrome) & iOS (Safari):
- Open the site in your browser.
- Tap the Share button (iOS) or Menu (Android).
- Select "Add to Home Screen".
- The app will appear in your app drawer and launch in full-screen mode.
⚠️ Important Note: This app works offline using cached data. If you manually perform a "hard clear" of your browser cache or site data, you will need an active internet connection to reload the app and fetch the latest updated version.
- Precision Math: Uses
Number.EPSILONrounding to prevent calculation errors. - Mobile-First Design: Optimized for Portrait mode with thumb-reachable controls.
- Storage: Uses
localStorageto keep your history safe even if you close the app. - No Tracking: Your data stays on your device.
Copyright (C) 2026 mrqd9.
This project is licensed under the GNU General Public License v3 (GPL-3.0).
Developed with ❤️ by mrqd9