Start with the big idea
Your FU number is the price of having choices. Learn how spending and withdrawal rates turn into a practical freedom target, then test it with the FU Number Calculator.
Guides
- The 4% Rule and 25× Rule Explained — what the shortcut means and what it leaves out.
- Why Savings Rate Matters More Than Income Alone — how saving more changes both sides of the equation.
- What Is Coast FIRE? — how existing investments can do more of the future work.
- What Is Barista FIRE? — using part-time income to reduce the portfolio you need.
Put the ideas to work
When you are ready, explore the full calculator toolbox. Every tool runs in your browser, and the results are estimates for education and planning—not financial advice.