Educational estimates — not financial advice
Early Retirement (FIRE) Calculator
How many years until you can retire early? Find your FIRE number, stress-test withdrawal rates against sequence-of-returns risk, bridge the gap to Social Security, and price the healthcare gap before Medicare.
Looking for a standard retirement planner? Our retirement savings calculator projects your savings to the traditional age of 65, with 401(k) match optimization, Roth vs. traditional comparison, and catch-up contributions. This tool answers the early-retirement (FIRE) questions instead: target retire age, years to financial independence, withdrawal-rate simulation, the Social Security bridge, and the pre-Medicare healthcare gap.
FIRE Number & Years to Financial Independence
Simplified model: constant real return, contributions at year-end, expenses flat in today's dollars. Real-world returns vary — see the withdrawal simulator for sequence risk.
Safe Withdrawal Rate Simulator
Sequence-of-returns risk, worked example. Two retirees each start with $1,000,000 and withdraw $40,000/year. Returns of −30%, +10%, +10% in that order leave $720,720 after 3 years; the same returns in the order +10%, +10%, −30% leave $754,320 — a $33,600 gap from order alone. Early losses plus withdrawals can permanently damage a portfolio.
Illustrative scenarios with simplified return paths — not a Monte Carlo analysis and not a prediction of actual markets.
Social Security Bridge
Retiring before you claim Social Security creates "bridge years" you must fund entirely from savings.
Claiming at 70 pays about 77% more per month than claiming at 62 (124% vs 70% of the age-67 benefit) — but you must fund more bridge years yourself. Compare claim ages with our break-even calculator.
Simplified estimate: bridge fund is expenses × gap years, before inflation and taxes. SS multipliers (62: 70%, 67: 100%, 70: 124%) are approximations, not official SSA figures.
Healthcare Gap Before Medicare
Medicare eligibility starts at 65. Retire earlier and you must cover the gap years yourself — most commonly through ACA marketplace plans.
Why this matters for FIRE: healthcare is often the largest surprise expense for early retirees. Marketplace premiums rise with age and vary widely by state — the default $8,000/year is only a starting guess. Replace it with quotes for your state, and remember costs grow with inflation over a 10–20 year gap.
Illustrative planning estimate only. Verify current ACA marketplace prices for your state and household.
Methodology
- FIRE number = annual expenses × multiplier (25× for the 4% rule, 33.3× for 3%, 20× for 5%).
- Years to FI solves S(1+r)n + C·(((1+r)n−1)/r) = target for n, with year-end contributions and a constant real return r. Linear when r = 0; 0 years when current savings already reach the target.
- Withdrawal simulation subtracts the inflation-adjusted withdrawal first, then applies the year's return, repeating each year.
- SS bridge = gap years × annual expenses (undiscounted, simplified); SS multipliers 62 → 70%, 67 → 100%, 70 → 124% are approximations.
- 4% rule originates from Bengen (1994), tested for 30-year retirements — treat it as a rule of thumb, not a guarantee.
- All figures are educational estimates, not financial advice. Taxes, fees, and real-world return volatility are not modeled.
Worked examples
- Classic FIRE: $100,000 saved, $30,000/year added, $50,000/year expenses, 5% real return → FIRE number $1,250,000, reached in ~19.9 years (retire at ~50 starting from 30).
- Lean vs Fat: $40,000/year expenses → $1,000,000 FIRE number; $100,000/year → $2,500,000.
- Already independent: $1,300,000 saved against a $1,250,000 target → 0 years, you are there.
Frequently asked questions
What is FIRE (Financial Independence, Retire Early)?
FIRE is a strategy for retiring much earlier than the traditional age of 65 — often in your 40s or 50s. The core idea: save and invest a large share of your income so that investment returns can cover your living expenses indefinitely. Once your invested savings reach your FIRE number, work becomes optional.
What is the FIRE number, and how is it calculated?
The FIRE number is 25 times your annual expenses. It comes from the 4% rule: if you withdraw 4% of your portfolio each year, you need a portfolio 25 times larger than your yearly spending (1 / 0.04 = 25). For example, $50,000 per year in expenses gives a FIRE number of $1,250,000. Use the calculator above with your own expenses for an exact figure.
What is the 4% rule?
The 4% rule is a rule of thumb from William Bengen's 1994 research: withdraw 4% of your portfolio in the first year of retirement, then adjust for inflation each year, and the money has historically lasted 30 years. It is a guideline, not a guarantee — and it was tested for 30-year retirements, so early retirees with 40-to-60-year horizons often plan with 3% to 3.5% instead.
How many years does it take to reach financial independence?
Mostly it depends on your savings rate, not your income. With a 5% real return, saving 20% of your income takes about 37 years, saving 50% takes about 17 years, and saving 70% takes about 9 years. The FIRE tab above solves the exact timeline for your savings, expenses, and assumed return.
What is the difference between Lean FIRE, Fat FIRE, and Coast FIRE?
Lean FIRE means retiring on a frugal budget, typically with a portfolio of $1 million or less. Fat FIRE means retiring with a high-spending lifestyle, typically $2.5 million or more. Coast FIRE is a middle path: you save enough early that compounding alone covers a traditional retirement at 65, so you only need to earn enough to cover current expenses. The calculator above covers all three — just change the expenses input.
What is sequence-of-returns risk?
Sequence-of-returns risk is the danger that poor market returns arrive early in your retirement. Two retirees can earn the same average return and end up very differently: with a $1 million portfolio and $40,000 annual withdrawals, three years of returns of -30%, +10%, +10% leave $720,720, while the same returns in the order +10%, +10%, -30% leave $754,320 — a $33,600 difference from order alone. Early losses combined with withdrawals can permanently cripple a portfolio, which is why early retirees keep cash buffers and flexible spending plans.
What is a Social Security bridge strategy?
A bridge strategy covers the gap between your early-retirement date and the age you claim Social Security (62 to 70). If you retire at 50 and claim at 67, you need 17 years of living expenses from savings — for $50,000 per year that is $850,000 of bridge funding (simplified, before inflation). Delaying Social Security boosts the monthly benefit: claiming at 70 pays about 77% more per month than claiming at 62. Use the bridge tab above, then compare claim ages with the break-even tool.
How do early retirees handle healthcare before Medicare?
Medicare eligibility starts at 65, so retiring earlier creates a healthcare coverage gap. In the US, most early retirees buy insurance on the ACA marketplace during the gap years, and premiums vary widely by state, age, and income. The healthcare tab above estimates your total gap cost from your retirement age to 65 using your own annual premium figure — treat it as a planning estimate and verify current marketplace prices.
Is a 3%, 4%, or 5% withdrawal rate safer for early retirement?
The longer your retirement, the lower the safe rate. The 4% rule was tested for 30-year retirements; a retirement at 45 could last 40 to 50 years, which is why many early retirees use 3% to 3.5% for extra safety. A 5% withdrawal rate has a meaningfully higher risk of depleting the portfolio. The withdrawal simulator tab above shows how 3%, 4%, and 5% compare over 30 years under steady, early-crash, and late-crash scenarios.
I reached 25 times my expenses — can I retire early now?
Hitting your FIRE number is the biggest milestone, but run a final checklist first: (1) healthcare coverage until Medicare at 65, (2) inflation protection over a multi-decade retirement, (3) sequence-of-returns risk in the first years, (4) taxes on withdrawals, (5) longevity — plan for 90+, and (6) whether your expense estimate includes one-off costs like home repairs or college. Many people work one extra year past their number as a safety margin.
How is this different from a standard retirement calculator?
Standard retirement calculators project your savings to the traditional retirement age of 65 and focus on 401(k) matches, Roth versus traditional accounts, and catch-up contributions — our retirement savings calculator covers that. This early-retirement tool answers the FIRE questions instead: your target retire age, years to financial independence, your FIRE number, withdrawal-rate simulation with sequence risk, the Social Security bridge gap, and the healthcare gap before Medicare.
Is this tool financial advice?
No. This tool provides educational estimates based on simplified models — it is not financial advice, and past market performance does not guarantee future results. Real retirement planning involves taxes, fees, inflation, and personal circumstances this calculator does not model. Consider consulting a qualified financial professional before making retirement decisions.
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