Your FIRE number and years to reach it.
FIRE number
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Years to financial independence
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The number behind the number
Financial independence has one piece of arithmetic at its core: your portfolio is big enough when it can pay your bills forever without you adding another dollar. The 4 percent rule turns that idea into a target. If you can live on 4 percent of your savings each year, you need 25 times your annual spending. Spend more conservatively at 3.5 percent and the multiple rises to around 28; loosen to 5 percent and it drops to 20. This tool takes whatever withdrawal rate you set, divides your spending by it, and shows the lump sum that frees you from needing a paycheque.
The second output is the one that actually changes behaviour: how many years it takes to get there. The calculator grows your current balance month by month, adding your contributions and compounding at the real return you enter, until it crosses the target. Because the return is a real figure, already net of inflation, the answer is in today's purchasing power rather than inflated future dollars.
Sixteen years on a $60,000 lifestyle
Take a household spending $60,000 a year that wants to retire on the classic 4 percent rule. They have $250,000 already invested across super and outside super, they tuck away $3,000 a month, and they assume a 5 percent real return. Here is how the tool gets to its answer.
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Push the contribution to $4,000 a month and the timeline shortens by roughly two and a half years. Trim spending to $50,000, which drops the target to $1.25 million, and you save more again. The lever most people underrate is the spending figure, because it cuts the target and frees up cash to invest at the same time. The curve below traces the balance climbing toward the $1.5 million line.
The super preservation wall
Here is the catch that the simple 4 percent maths hides in Australia. A large share of your wealth is probably locked inside superannuation, and you cannot touch it until your preservation age, which is 60 for anyone born after June 1964. If you plan to stop work at 45, hitting a $1.5 million total means little if $700,000 of it is sealed in super for fifteen years. Serious Australian FIRE plans split the goal in two: an outside-super bridge portfolio large enough to fund the gap years, and a super balance that takes over once it unlocks. The tool gives you the combined target, so treat it as the ceiling and then work out how much must sit outside super to carry you to 60.
A common mistake is assuming the 12 percent superannuation guarantee will quietly do the heavy lifting. It helps, but employer contributions land in the very account you cannot access early, so they build the wrong bucket for an early retiree. If you are aiming to finish well before 60, voluntary investing outside super usually matters more than topping up the concessional cap.
Who this is for
This estimator suits anyone testing whether early retirement is years or decades away, and whether their savings rate is anywhere near enough. It is deliberately a planning sketch, not a guarantee. Real returns vary, the 4 percent rule was built on long historical data that may not repeat, and sequence-of-returns risk means a bad run early in retirement bites hardest. Treat the years figure as a direction of travel, then revisit it annually as your spending and balance shift.
Should I use a return before or after inflation?
Use a real return, meaning growth after inflation, which is what the input expects. A diversified share-heavy portfolio has historically delivered something in the range of 4 to 6 percent real over long periods. Entering a nominal return like 8 percent will badly understate how many years you need, because your $60,000 of spending will itself rise with the cost of living.
Is the 4 percent rule safe for a 40-year retirement?
It was calibrated on a 30-year horizon, so a very early retiree planning for 40 or 50 years should lean more cautious. Many in the Australian community use 3.25 to 3.75 percent for long runways, which raises the target but buys a wider safety margin. You can model this directly by lowering the withdrawal rate field and watching the FIRE number climb.
Does the age pension change my number?
It can. From age 67, a means-tested age pension may top up your income, which means strict FIRE purists who plan to that age sometimes target a slightly smaller portfolio. This calculator ignores the pension to keep the result self-funded and conservative, which is the safer assumption for anyone retiring decades before pension age.