FIRE - Financial Independence, Retire Early - is a quiet bargain with your future self: spend less than you earn, invest the gap, and one day let the portfolio pay the bills so that work becomes a choice.
Simple to say. The timing is the hard part.
Most of us can picture the destination - enough invested that a salary is an option rather than a leash. What stays blurry is the when, and the part nobody enjoys thinking about: whether the money actually holds once the paychecks stop. The two headline numbers on this page speak to precisely that - the year your savings cross the independence line, and how deep into retirement they stretch before they begin to thin out.
The price tag on optional work
Financial independence has a number, and it is easier to estimate than most people expect. Roughly speaking, take one year of spending and multiply it by 25.
That 25 is not plucked from the air. It is the mirror image of the 4% rule. Withdraw about 4% of your pot in the first year, nudge that dollar amount up with inflation afterward, and decades of market history suggest the balance tends to survive a roughly 30-year retirement. Twenty-five times your annual spending is simply 1 ÷ 0.04.
Want a thicker cushion? A 3.5% rate (about 29x) leans cautious. A 5% rate (20x) is braver - it quietly assumes either generous markets or a willingness to trim spending in lean years. The multiplier field above is where you make that bet.
The 4% rule in one line: draw about 4% of your starting pot in year one, raise it with inflation after, and history suggests it can last around 30 years. Retire young and you will want a gentler 3-3.5%.
Why today's number won't be tomorrow's
Here is the catch the headline figure hides: a coffee that costs $5 today won't cost $5 in two decades. Your FIRE number quietly grows every year inflation does - which is why this tool shows both a today's value and an at-retirement value. The second one is usually the sobering one. To feel that drift on its own, our inflation calculator traces how a fixed budget swells over time.
The growth side leans on compounding - the same force this page runs month by month. If you simply want to watch a lump sum or a steady monthly habit balloon without the retirement overlay, the investment return calculator and the future value calculator isolate that math cleanly.
Every projection here rests on assumptions - your return, inflation, how long you live - and reality rarely files them in a tidy line. The largest blind spot is sequence-of-returns risk: a crash in the first few years of retirement does far more damage than the same crash a decade later, even when the long-run average is identical. Two retirees with the very same average return can land worlds apart depending purely on the order those returns arrived. That is why the average case can look comfortable while the unlucky case quietly runs dry - and why the Monte Carlo button above tells you more than the single headline year. Read these results as a direction to walk, not a date to circle.
Lean, standard, or fat - same engine, different finish
The lifestyle toggle doesn't change the math; it moves the target. Lean FIRE trims the budget and pulls the finish line closer, at the cost of a leaner life. Fat FIRE does the reverse. Standard sits in the middle.
Some people would rather never draw the portfolio down and instead live off the income it throws off - dividends, interest, rent. If that is your leaning, the dividend calculator and the annuity calculator reach the same freedom from the cash-flow side rather than the nest-egg side.
Different routes. The same morning where the alarm is optional.
