Math-first explanations of the concepts behind financial independence. No fluff, no guesswork — just the formulas, research, and frameworks you need to build a real plan.
Core concepts every FI-seeker should understand.
Understand the formula behind your FI number, the 25x rule, and how to estimate your annual expenses in retirement.
Read →Where the 4% rule came from, what the research actually says, and how to decide if it's right for your retirement timeline.
Read →Why time matters more than amount, the Rule of 72, and the real cost of waiting to start investing.
Read →How to calculate your Coast FIRE number, the difference from regular FIRE, and whether this strategy suits your situation.
Read →A deep dive into sequence-of-returns risk, dynamic withdrawal strategies, and how to choose the right rate for your plan.
Read →Put it into practice
Use our free projection tool to model your portfolio, home equity, and retirement target — no sign-up required.