FIRE Number Calculator: Find Your Path to Financial Independence
Your FIRE number is the amount of money you need invested to live off your portfolio indefinitely. FIRE stands for Financial Independence, Retire Early — a movement built on a simple premise: once your investments are large enough, the returns they generate can cover your living expenses for the rest of your life. This FIRE number calculator uses your annual expenses and a safe withdrawal rate to reveal exactly how much you need, then estimates how many years of consistent saving and investing it will take to get there.
The math behind your FIRE number is straightforward. Divide your expected annual expenses by your safe withdrawal rate. Using the popular 4% rule, that is the same as multiplying your annual spending by 25. If you spend $40,000 per year, your FIRE number is $1,000,000. Choosing a lower withdrawal rate, such as 3.5%, produces a larger target but a greater margin of safety against market downturns and long retirements.
Reaching your FIRE number depends on three levers: how much you already have invested, how much you add each year, and the return your portfolio earns. The calculator projects your balance forward one year at a time, applying your expected annual return and then adding your yearly savings, until the balance meets or exceeds your target. Raising your savings rate is usually the fastest way to shorten the timeline, because it both grows your investments and lowers the expenses you ultimately need to cover.
FIRE is a planning framework, not a guarantee — real returns vary and inflation erodes purchasing power over time. Treat the result as a target to steer toward and revisit it as your income and spending evolve. To dig deeper, pair this tool with our compound interest calculator to see how growth accelerates, our investment calculator to model contributions, and our retirement calculator for a traditional retirement view.