What Is FIRE? A Beginner's Guide to Financial Independence, Retire Early

FIRE stands for Financial Independence, Retire Early. It describes a personal-finance approach focused on aggressive saving and investing so that, at some point, your investment portfolio can cover your living expenses indefinitely — freeing you from the need to work for income.

The core idea rests on the 4% rule (also called the safe withdrawal rate): if you withdraw roughly 4% of your portfolio's value per year, historical market data suggests your portfolio has a high probability of lasting 30+ years, adjusted for inflation. Working backward, your "FIRE number" is typically about 25 times your expected annual expenses in retirement.

Reaching FIRE usually combines three levers: increasing your savings rate (the percentage of income you invest rather than spend), reducing recurring expenses, and choosing an investment strategy with a reasonable expected long-term return, most commonly a diversified low-cost index fund portfolio.

FIRE isn't one-size-fits-all — variations like Lean FIRE, Fat FIRE, and Coast FIRE let people tailor the approach to their own goals and risk tolerance. Use the FIRE Calculator above to plug in your own numbers and see an estimate of your FIRE number and how many years remain.