110 lines
4.4 KiB
Markdown
110 lines
4.4 KiB
Markdown
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# InvestingFIRE 🔥 — The #1 Interactive FIRE Calculator
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**InvestingFIRE** is a responsive web application for calculating your path to Financial Independence and Early Retirement (FIRE). It features a year-by-year projection engine that simulates both accumulation (savings and investment growth) and retirement (withdrawals) phases, allowing users to:
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- Input starting capital, monthly savings, expected annual growth rate, inflation rate, current age, desired retirement age, life expectancy, and desired monthly retirement allowance.
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- View a dynamic chart displaying projected portfolio balance and monthly allowance over time.
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- Instantly see their estimated “FIRE number” (required capital at retirement), how long their capital will last, and compare results to the “4% rule.”
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- Adjust assumptions live, with all calculations and visualizations updating automatically.
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- Access explanatory content about FIRE methodology, key variables, and additional community resources, all on a single, consolidated page.
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The project’s code is structured using React/Next.js with TypeScript, focusing on user experience, modern UI components, and clarity of financial assumptions.
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---
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## 🚀 Features at a Glance
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- **⚡️ Real-Time Projections:** Every field updates the chart _as you type_. Experiment with savings, growth rates, inflation, or retirement age and see your future instantly.
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- **📈 Interactive Chart:** Dual-area plots for portfolio value and future monthly spending, plus reference lines for FIRE milestones and “4% rule” legends.
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- **🧠 Education Baked In:** Contextual tooltips, deep-dive sections on how FIRE works, FAQs, and must-read resources included.
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- **🔎 Detailed Methodology:** Not just a 25x rule — runs a full, year-by-year simulation with inflation-adjusted withdrawals and optional 4%-rule overlays.
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- **👌 Modern UX:** Typing, sliding, or clicking feels _good_. Responsive on all devices.
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---
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## 🧰 How It Works
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The calculator models your FIRE journey in two phases:
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1. **Accumulation:**
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- Your starting capital is grown by your expected CAGR (~7% by default).
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- Monthly savings are added for each year until retirement.
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- Every variable can be adjusted live (capital, savings, age, growth, inflation, spending, target retirement).
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2. **Retirement:**
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- Your balance continues to grow by CAGR.
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- Each year, an inflation-adjusted monthly allowance is withdrawn.
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- The simulation runs until your selected life expectancy, showing the possibility of portfolio depletion.
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**Key Outputs:**
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- 🔥 “FIRE Number”: Portfolio value at your defined retirement age
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- 📊 Interactive projection chart: See how your nest egg and withdrawals evolve over time
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- 4️⃣ “4% Rule” overlays: Compare dynamic results to classic rule-of-thumb
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---
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## 🌟 Try It For Yourself
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To run locally:
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1. **Clone the repo**
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```bash
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git clone https://git.schulze.network/schulze/fire.git
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cd fire
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```
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2. **Install dependencies**
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```bash
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npm install
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```
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3. **Run the app**
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```bash
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npm run dev
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```
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4. Visit [http://localhost:3000](http://localhost:3000) and unleash the fire.
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Deployed version: [https://investingfire.com](https://investingfire.com)
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---
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## ✏️ Inputs & Variables
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- **Starting Capital** — How much you’ve already invested
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- **Monthly Savings** — What you’ll add each month
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- **Current Age & Retirement Age** — Your FI timeline
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- **Life Expectancy** — How long do you want income to last?
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- **Expected Growth Rate (CAGR)** — Portfolio annual % return, before inflation
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- **Inflation Rate** — Cost of living increases
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- **Desired Monthly Allowance** — Your lifestyle, today’s dollars
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As you adjust these, all projections update instantly _without needing to hit “Calculate.”_
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Try many “what ifs” fast.
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---
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## 👩💻 Contributing
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Pull requests are welcome! Open issues for bugs, new features, or debate about safe withdrawal rates and tax assumptions.
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---
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## 📄 License
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[GPL-3.0](./LICENSE)
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---
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## 🥇 Why Use InvestingFIRE?
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- You want the truth — not just a 4% fantasy.
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- You want to learn, not just punch in numbers.
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- You want clarity, speed, and modern UI.
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- You want to show your friends the best FIRE tool on the web.
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Enjoy the _rocket ride_ to financial independence.
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**InvestingFIRE — Know your number. Change your future.**
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