A private, offline-first FIRE (Financial Independence, Retire Early) calculator. Calculate your path to financial freedom with 6 different calculator types—all running 100% in your browser.
- No cookies - We don't use any cookies for tracking
- Automatic saving - Your calculator inputs are saved in your browser for convenience
- Local storage only - Data never leaves your device (stored in browser localStorage)
- UI preferences only in the past - Now also includes calculator inputs for seamless experience
- No analytics - Zero tracking scripts
- No servers - All calculations run client-side
- URL-based sharing - Share your calculations via URL when you want to (your choice!)
After first load, the app works completely offline. Install it as a PWA on your device for the best experience.
| Calculator | Description |
|---|---|
| 🎯 Standard FIRE | Classic 25x expenses rule - calculate your "magic number" |
| ⛵ Coast FIRE | Find how much you need so compound growth does the rest |
| 🌿 Lean FIRE | Achieve FI faster with a minimalist lifestyle (≤$40k/year) |
| 💎 Fat FIRE | Retire in style without compromising ($100k+/year) |
| ☕ Barista FIRE | Blend part-time work with portfolio income |
| 📊 Withdrawal Rate | Test portfolio longevity at different withdrawal rates |
| 🧮 Savings Rate | Calculate how your savings rate impacts time to FIRE |
| 🔄 Reverse FIRE | Work backwards - set target age, find required savings |
| 🏥 Healthcare Gap | Estimate costs between early retirement and Medicare |
- Clean, modern interface
- Dark mode with system preference detection
- Fully responsive (mobile, tablet, desktop)
- Interactive charts powered by Recharts
- Progress bars showing your journey to FIRE
- Quick presets for common scenarios
# Clone the repository
git clone https://github.com/jamesmontemagno/app-fire-calculator.git
cd app-fire-calculator
cd web
# Install dependencies
npm install
# Start development server
npm run dev
# Build for production
npm run build# From the repository root
dotnet build app/MyFireNumber/MyFireNumber.csproj -f net10.0-android
dotnet build app/MyFireNumber/MyFireNumber.csproj -f net10.0-iosPull requests that change app/** run Android and iOS validation workflows. Manual workflow runs
can also create signed Android App Bundles and iOS archives. See
Mobile Release Secrets for the required credentials and setup
steps.
For Debug-time native UI inspection and automation, see MAUI DevFlow.
- React 19 - UI framework
- TypeScript - Type safety
- Vite - Build tool
- Tailwind CSS v4 - Styling
- React Router v7 - Routing & URL state
- Recharts - Charts
- vite-plugin-pwa - Offline support
FIRE Number = Annual Expenses / Withdrawal Rate
Example: $48,000 / 0.04 = $1,200,000
Coast Number = FIRE Number / (1 + Real Return)^Years
Barista Number = (Annual Expenses - Part-Time Income) / Withdrawal Rate
Your calculator inputs are automatically saved in your browser's local storage for convenience:
- Persists across sessions - Your values are remembered when you return
- Never leaves your device - All data stays in your browser
- URL takes precedence - Opening a link with parameters overrides saved values
- Easy to clear - Use the Reset button to clear both URL and saved data
All calculator inputs can also be stored in the URL. This means:
- ✅ Bookmark your calculations
- ✅ Share links with specific values (saved data is NOT shared in links)
- ✅ Browser back/forward works
- ✅ URL parameters override saved values
Example URL:
/standard?age=30&retire=55&savings=100000&contrib=24000&expenses=48000
The app stores only:
- Calculator inputs (ages, income, savings, etc.) - in localStorage
- Theme preference (light/dark mode) - in localStorage
- Sidebar state (open/closed) - in localStorage
No tracking, no analytics, no cookies, no external storage.
MIT License - Feel free to use, modify, and distribute.
- The FIRE community for spreading financial literacy
- Trinity Study for the 4% rule research
- All open-source contributors
Built with ❤️ for the FIRE community
Remember: This calculator provides estimates for educational purposes. Consult a financial advisor for personalized advice.