FIRE Guides

Your complete library for mastering financial independence

The 4% Rule: Does It Still Work?

The foundation of most FIRE calculations. Understand where it came from, what it actually says, and the ongoing debate about its validity.

12 min read

Using the Fire Planner

Set up your plan in five numbers, read when you can retire across three models, stress test it, and track it with check-ins. Covers the inputs, the evidence, withdrawal strategies, plans, share links, and the CSV.

12 min read

Mathematical Foundations: Fire Planner Engine

Full derivations and proofs for every formula: compound growth, drift-corrected lognormal Monte Carlo, historical backtesting, withdrawal strategies, and stress test models.

20 min read

References & Further Reading

The research behind the calculators. Trinity study, historical returns, and the academic foundations of the 4% rule.

15 min read

Ready to Run the Numbers?

Once you understand the concepts, see where you stand: