Projected end-of-year portfolio value, using the same monthly growth and contributions as the calculator, until the FIRE number is reached (capped at 50 years).
Year
Contributions This Year
Portfolio Value
% of FIRE Number
1
$36,000
$91,500
6%
2
$36,000
$136,444
9%
3
$36,000
$185,119
12%
4
$36,000
$237,833
16%
5
$36,000
$294,923
20%
6
$36,000
$356,751
24%
7
$36,000
$423,711
28%
8
$36,000
$496,229
33%
9
$36,000
$574,765
38%
10
$36,000
$659,820
44%
11
$36,000
$751,935
50%
12
$36,000
$851,695
57%
13
$36,000
$959,735
64%
14
$36,000
$1,076,742
72%
15
$36,000
$1,203,461
80%
16
$36,000
$1,340,697
89%
17
$36,000
$1,489,324
99%
18
$36,000
$1,650,287
110%
Estimates only — not financial, tax, or professional advice.
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What it calculates: FIRE Number (Target Portfolio), Gap to FIRE, Years to Financial Independence, Months to Financial Independence.
A 4% withdrawal rate is the same statement as twenty-five times annual spending
Dividing annual spending by the withdrawal rate gives the target: $60,000 divided by 4% is $1,500,000. That is identical to multiplying spending by 25, and the two framings are worth holding together — the rate makes the assumption visible, the multiple makes the scale memorable.
FIRE Number = Annual Expenses / SWR | At 4% SWR = 25x annual expenses
The number is driven by spending, not income. Someone earning $200,000 and spending $60,000 needs the same $1.5m as someone earning $80,000 and spending $60,000; the first simply gets there faster. This is why reducing planned spending is the most powerful lever available: cutting $5,000 a year from the target lifestyle removes $125,000 from the number that must be accumulated.
A 30-year historical survival rate, not a guarantee, and not designed for a 50-year retirement
The 4% figure comes from studies of historical US market returns testing how much could be withdrawn, inflation-adjusted, without exhausting a portfolio over thirty years. It was a backtest of a specific period and a specific asset mix, and it described a high survival rate rather than certainty.
Early retirement stretches it. A portfolio that must last fifty years faces more sequences than one lasting thirty, and later research often suggests 3.25–3.5% for very long horizons. Moving the rate from 4% to 3.5% raises this target from $1.5m to $1.71m; moving it to 3% raises it to $2m. The withdrawal rate is the single most consequential assumption on the page, and it deserves more scrutiny than the return assumption.
Seventeen years here, and the savings rate matters far more than the return
The default path — $50,000 saved, $3,000 a month added, 8% expected return — reaches $1.5m in about 205 months, just over seventeen years. Raising the assumed return to 10% shortens that to roughly fifteen years. Raising the monthly contribution to $4,000 instead shortens it to about fourteen and a half.
The contribution wins because it does two things at once: it adds more capital and, if the increase comes from spending less, it also lowers the target. Someone who cuts $1,000 a month of spending and saves it moves the target down by $300,000 and the contribution up by $1,000 simultaneously. Returns are largely outside your control; the savings rate is not.
A bad first five years can exhaust a portfolio that averaged exactly the assumed return
This projection compounds at a constant 8%. Real markets deliver that as an average across very uneven years, and the order matters enormously once withdrawals begin. Two retirees with identical average returns can end in completely different places if one meets a severe downturn in the first five years of drawdown, because selling assets to live on locks in losses that never recover.
The standard defences are holding one to three years of spending in cash or short bonds, reducing withdrawals in bad years rather than holding them fixed, and keeping some earned income in early retirement. None appears in the arithmetic here, and all of them matter more than the difference between a 7% and an 8% assumption.
Health insurance, taxes, and the fact that spending is not flat
The model grows a single pot at a constant rate and stops when it reaches the target. It does not model tax on contributions or withdrawals, the difference between taxable and tax-advantaged accounts, or the penalties and access rules that govern retirement accounts before the standard age — a serious constraint for early retirement specifically.
For a US early retiree the largest omission is usually health insurance, which employer coverage had been subsidising and which must be bought privately until Medicare eligibility. Spending itself is rarely flat either: it tends to be higher in early retirement, lower in the middle, and higher again late in life. Treat $1.5m as a well-defined target under stated assumptions rather than a number that survives contact with a real retirement unchanged.
Frequently Asked Questions
What is the 4% rule?
The 4% rule is a guideline suggesting a balanced portfolio can support annual withdrawals of about 4% of its starting value for roughly thirty years. Dividing your annual expenses by 4% is the same as multiplying by 25, which is why a FIRE number is often described as 25 times yearly spending. For a longer, 40-plus-year horizon, many people use a more cautious 3.5% (about 28.5 times expenses).
What are the FIRE variants?
Lean FIRE targets a frugal lifestyle and a smaller portfolio. Fat FIRE aims for a comfortable lifestyle and a larger one, often thirty or more times expenses. Coast FIRE means you have already saved enough that growth alone will reach the target without further contributions. Barista FIRE blends partial independence with part-time work that covers some expenses or benefits.
How do I lower my FIRE number?
Because the number is driven by your expenses, reducing spending is the most direct lever: every dollar of annual spending you cut lowers the target by 25 dollars at a 4% rate. Paying off a mortgage before retirement, relocating to a lower-cost area, or trimming recurring costs all shrink the figure you need to hit.
What is sequence-of-returns risk?
It is the danger that a run of poor returns early in retirement, while you are withdrawing, permanently damages a portfolio more than the same returns would later. Selling assets to fund withdrawals during a downturn locks in losses. Keeping a cash cushion, staying flexible with spending, and using a conservative withdrawal rate all help manage it.
Does this account for inflation?
The years-to-FIRE projection grows your portfolio with your expected return and contributions but does not separately inflate your expenses over time. Since your real spending may rise with inflation, consider expressing the expense figure in the terms you expect at retirement, or use a more conservative withdrawal rate to build in a buffer.
Do I have to retire once I hit my FIRE number?
No. Reaching the number means work becomes optional, not mandatory. Many people who achieve financial independence keep working in some form because they enjoy it, want extra security, or prefer a slower transition. The number is a milestone of freedom and choice rather than a deadline to stop.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Sequence of returns risk, taxes, and healthcare not modeled.
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Results are estimates based on the figures you enter and standard formulas. Rates, fees, taxes, and lender terms vary and change over time, so confirm important numbers with your lender or a qualified professional. This is educational information, not financial advice.
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Frequently Asked Questions now show on the page: 6 answers, checked in a page-by-page audit.
What the calculation assumes and where it stops now show on the page.
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