Early Retirement Calculator

Early retirement is not an age, it is a number: the portfolio whose returns can fund your life without a salary. Enter what you have saved, what you add each year, what you expect to spend in retirement, and your current age, and this early retirement calculator returns your FIRE number, the years to reach it, and the age the salary becomes optional.

The FIRE Number: 25 Times What You Spend

The framework comes from the Trinity study’s famous result: a diversified stock-bond portfolio, drawn at 4 percent of its starting value per year (then inflation-adjusted), survived nearly every 30-year window in US market history. Invert the 4 percent and the target appears: 25 times your annual spending. Note what the target prices — spending, not salary. A household earning $120,000 and spending $48,000 needs $1.2 million, not $3 million, because the portfolio must replace the outgo, not the income; the gap between earning and spending is doing double duty, since every dollar not spent both lowers the target and raises the contributions. That is why the savings rate is the master variable of early retirement (at a 50 percent savings rate with typical returns, the classic estimate is roughly 17 working years regardless of income level — the mathematics Mr. Money Mustache’s “shockingly simple math” essay made famous), and why this calculator asks for spending and contributions before it asks for anything else. Enter only the spending your portfolio must carry: a future pension or Social Security benefit that covers $18,000 a year cuts the example’s target by $450,000.

Worked Example: Retire at 51 on $48,000 a Year

The defaults: age 35, $150,000 invested, $30,000 added yearly, 7 percent returns, retirement spending of $48,000. The FIRE number is $1,200,000, and the growth loop reaches it in 16 years — at age 51 — with the portfolio crossing the line at about $1.28 million in the crossing year. Watch the contributions’ share shrink as compounding takes over: of the roughly $1.13 million of growth between today and the target, contributions supply $480,000 and returns supply the rest — the back half of the journey is mostly the money working, not the person. The widget also prints the coast number: the amount that, invested today and never added to, would still reach the target by 65 through compounding alone — here $157,641, uncannily close to the $150,000 already saved, meaning this household is within a rounding error of “coast FIRE” for a conventional retirement age even if contributions stopped entirely. Between the two numbers — coast at 65, full FIRE at 51 — lives the entire menu of modern semi-retirement strategies.

Coast, Barista, Lean and Fat: The Flavours of the Same Number

The community’s dialects all describe points on this calculator’s two axes. Coast FIRE is reaching the coast number: contributions can stop, compounding finishes the journey by a conventional age, and work becomes a choice about lifestyle rather than retirement funding. Barista FIRE targets a portfolio that covers most spending, with a part-time or low-stress job covering the rest — and, in the US system, often chosen for its access to employer health insurance, the line item below. Lean FIRE shrinks the spending input (a $30,000 life needs $750,000) and Fat FIRE refuses to (a $120,000 life needs $3 million) — the calculator is agnostic: it multiplies whatever spending you honestly enter. And one-more-year syndrome is the recognised failure mode at the finish line, where the target is reached and the worker adds a year “for safety” five times; the honest antidote is to decide, in advance and in writing, which number ends the accumulation — this page has now computed yours.

What the Number Leaves Out — Deliberately, and You Should Not

Three omissions matter. Health insurance is the big one for pre-65 US retirees: marketplace premiums for a couple in their 50s can run $12,000-24,000 a year unsubsidised — if it is not inside your spending figure, add it, because at 25x every $10,000 of spending is $250,000 of target. Taxes: withdrawals from traditional retirement accounts are taxed as income, so a portfolio that must deliver $48,000 after tax needs to fund more — the standard practice is to build the tax into the spending number. Sequence risk: the 4% rule survived history’s windows, but a crash in the first five years wounds a portfolio drawn upon far more than the same crash later — the mitigations (a cash buffer of 1-2 years’ spending, flexible withdrawals in down years, the “guardrails” the withdrawal page discusses) belong to the drawdown plan, not the accumulation target. None of this invalidates the number; it defines the homework between reaching it and resigning. For the institutional frame — benefit ages, earnings limits, how work after claiming affects payments — the Social Security Administration’s retirement resources are the authoritative source.

The Years Between: What Accumulation Actually Looks Like

An honesty note about the path, because the smooth curve above misrepresents the experience. The 16 years of the worked example will contain at least one market drawdown of 30 percent or more (the historical cadence makes it near-certain), stretches of two or three years where contributions buy shares that go nowhere, and years where the portfolio grows by more than the salary. The plan survives all of it if the contributions survive — which is why the sustainable version of this strategy automates the contribution, sizes it below the level that breeds resentment, and treats the spending input as a floor worth defending rather than a ceiling to apologise for. The households that reach the number are rarely the ones with the most extreme savings rate in year one; they are the ones still contributing, unremarkably, in year eleven. Boredom is the strategy working.

Raising the Savings Rate: Where the Years Hide

Since contributions and spending steer the result, here is the example’s sensitivity, to make the trade tangible. Adding $500 a month ($6,000 a year) to the contributions — $36,000 a year total — pulls the FIRE date in by a year, to age 50. Cutting planned retirement spending by $6,000 a year (to $42,000) lowers the target by $150,000 and buys two full years, to age 49. Doing both compounds to 13 years — retirement at 48. The symmetry is the lesson: a dollar of spending removed from the retirement budget is worth exactly as much time as a dollar of contribution added, because it works the target from both ends — which is why the durable early retirements are usually built less on heroic income than on a spending design the household genuinely enjoys at $42,000 and merely tolerates at $48,000. Run your own variants in the widget; the age it prints is the most motivational number in personal finance, precisely because it moves.

Related Tools

More from the Finance Calculators hub: the Retirement Withdrawal Calculator — the drawdown half of this page’s story — the SIP Calculator for the monthly-investment engine, and the CPI Inflation Calculator for what your target is worth in future money.

Frequently Asked Questions

Is the 4% rule still safe for a 40- or 50-year retirement?

It was calibrated on 30-year windows; longer horizons deserve a bigger cushion, and the standard adjustments are a lower starting withdrawal (3.5 percent changes the target multiple from 25x to about 28.6x — enter spending and divide by your chosen rate, or equivalently multiply spending by 28.6), spending flexibility in down years, or a part-time income bridge. Historical simulations at 3.5 percent survive essentially every US window including the 1966 start, the worst on record. This page uses 25x as the headline and prints the reasoning in its note; treat the multiple as a dial set by your horizon and nerve, not a constant of nature.

Should I include my house in the FIRE number?

Only if you will sell it or borrow against it in retirement — the target funds spending from invested assets, and a home you live in produces housing, not cash flow (it does lower the spending side, since a paid-off home removes rent from the budget, which is its proper entry: through the spending input, not the savings input). Downsizers may count the equity they genuinely expect to release; everyone else should let the house be a home and a contingency reserve, not a pillar of the plan.

What return should I assume?

Long-run US equities have returned roughly 10 percent nominal (about 7 percent after inflation) and balanced portfolios less; this page’s 7 percent nominal default is a planning convention, not a forecast. Two disciplines: run the calculator at 5 percent and 9 percent as well, and notice the plan should survive the low case with adjustments (a year or two more, slightly less spending) rather than collapse; and remember returns arrive unevenly — the average is a summary, and the accumulation years forgive sequence in a way the withdrawal years do not.

Does retiring early reduce my Social Security?

Yes, twice, and planning should count both: benefits are computed from your 35 highest earning years, so stopping at 51 leaves zeros or low years in many records (a smaller benefit), and claiming early (from 62) reduces it further — while delaying toward 70 raises it by about 8 percent a year of delay. For many early retirees the optimal bridge is portfolio withdrawals funding the gap to a delayed, larger benefit — which lowers the late-life spending the portfolio must carry, and therefore the target itself. The SSA’s own estimators model your actual record; run them before finalising the number here.

What is the biggest mistake people make with this calculation?

Entering the spending they wish they had instead of the spending they have — usually by forgetting the irregulars: car replacements, home repairs, travel, gifts, health costs, the hundred small annuals that never make a monthly budget. Audit two or three real years of outflows (bank statements do not flatter) before trusting the target. The second mistake is treating the output as a cliff edge: the number is a planning instrument with ±20 percent honesty bands, and a retirement begun at 23x with flexible spending is safer than one begun at 25x with rigid spending and no plan for the first crash.