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FIRE Calculator
What number sets you free? This FIRE calculator finds your financial independence number — the portfolio your spending can live on — then shows your savings rate, the years to early retirement, and a Coast FIRE milestone tied to your safe withdrawal rate.
See how this works on an $80,000 income — 3 real examples
Your FIRE number
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Years to FI
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Savings rate
0%
Annual savings
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Coast FIRE number
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Savings rate vs. years to financial independence
How long you'd take to reach your FIRE number at different savings rates — your current rate is marked.
Savings-rate sensitivityYears to FI at savings rates from 10% to 70%
| Savings rate | Annual savings | Years to FI |
|---|
How your FIRE number and years to FI are figured
Financial independence rests on one idea: once your portfolio is large enough that a safe yearly withdrawal covers your spending, you never have to work for money again. Your FIRE number is just your spending divided by that withdrawal rate:
FIRE number = annual expenses / SWR
At a 4% safe withdrawal rate the divisor 0.04 becomes a multiplier of 25× your expenses; at 3% it is about 33×. Your savings rate is (income − expenses) / income, and your annual savings is simply what's left over.
Years to FI grows your current portfolio plus each year's savings at your expected real return — the return after inflation — and finds the number of years until the balance reaches your FIRE number, solved with the standard time-value-of-money relationship. Because the return is already real, every figure on this page is in today's dollars, so no separate inflation adjustment is needed. If your expenses meet or exceed your income there's nothing to invest, so years-to-FI is undefined until you start saving.
Coast FIRE discounts your FIRE number back to today at the same real return over the years until your traditional retirement age:
Coast FIRE number = FIRE number / (1 + real return)years to retirement
If your portfolio already exceeds that amount, it will coast to your full FIRE number on its own — you'd only need to earn enough to cover current spending. These are projections at a constant return, not a forecast: real markets vary year to year, and an early retirement spanning 40-plus years carries more sequence-of-returns risk than the 30-year horizon the 4% rule was built on, so treat the result as a planning estimate.
Same income, three budgets, three finish lines
An $80,000 income, a $50,000 head start, and one variable: annual spending. Every cut saves more and shrinks the target at once.
Spending $45,000 a year
to reach FI18.2 years
- Setting aside $35,000 of an $80,000 income — a 43.8% savings rate — builds toward a $1,125,000 target.
- At a 4% withdrawal rate, $1,125,000 can supply the full $45,000 of spending each year.
- With $203,952 invested and nothing more added, the portfolio would still reach that target by 65.
A comfortable budget and a real finish line — financial independence a little after 48.
Load this example (opens in a new tab)Spending $40,000 a year
to reach FI15.4 years
- Half of every dollar earned now goes to the future, and the target eases to an even $1,000,000.
- A $5,000 trim pulls the finish 2.8 years closer, from 18.2 down to 15.4.
- The coast threshold falls to $181,290 — past it, growth alone covers the rest of the distance by 65.
The same $5,000 works twice — more saved every year, and a smaller number to reach.
Load this example (opens in a new tab)Spending $35,000 a year
to reach FI12.8 years
- A 56.3% savings rate meets a target that has dropped to $875,000 — $250,000 below the first scenario.
- Independence arrives in 12.8 years, at about age 43 — 5.4 years ahead of the $45,000 budget.
- The coast point is $158,629; the existing $50,000 already covers almost a third of it.
The earliest arrival here comes from the spending line, not the income line.
Load this example (opens in a new tab)Illustrations only, not financial advice. Your own rate, taxes and insurance will differ — check with a qualified financial advisor before acting on any of this.
Reaching financial independence, in plain English
- Your savings rate is the dial that matters. It beats chasing an extra point of return, because saving more grows the portfolio and shrinks the number you need at the same time — watch the sensitivity curve above.
- Spending sets the target. Every $1,000 you trim from annual expenses lowers your FIRE number by $25,000 at a 4% withdrawal rate. Frugality is worth 25× on the nest egg.
- Pick a withdrawal rate you can live with. 4% is the famous rule, but a 40-to-50-year early retirement often calls for 3–3.5% and some spending flexibility.
- Coast FIRE is a real milestone. Once your portfolio can coast to your number by 65, you can throttle back saving and let compounding finish the job.
- Use real returns. Modeling the after-inflation return keeps every dollar in today's purchasing power, so your FIRE number means what you think it means.
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Frequently asked questions
What is FIRE (Financial Independence, Retire Early)?
FIRE is a strategy of saving and investing a large share of your income so that your portfolio can cover your living expenses indefinitely — letting you stop working decades before a traditional retirement age. The moment your investments can safely fund your annual spending, you are financially independent; retiring early is then optional. This FIRE calculator estimates the nest egg you need and how many years of saving it takes to get there.
How is my FIRE number calculated?
Your FIRE number is your annual expenses divided by your safe withdrawal rate. At the classic 4% rate that is simply 25 times your yearly spending — if you live on $45,000 a year, your financial independence number is about $1,125,000. Drop the withdrawal rate to 3% for a more conservative early retirement and the multiple rises to roughly 33× ($1,500,000 on the same spending).
What is a safe withdrawal rate?
The safe withdrawal rate (SWR) is the percentage of your portfolio you can draw in the first year of retirement, then adjust for inflation each year, without running out of money. The 4% rule comes from the Trinity study of 30-year retirements. Because an early retirement can last 40, 50 or more years, many in the FIRE community use 3–3.5% to build in a bigger margin — this calculator lets you slide the SWR and watch your FIRE number move.
How does my savings rate affect my years to retirement?
Your savings rate — the share of your take-home income you keep — is the single biggest lever, far more than your exact return. Saving 10% of your income can take over 40 years to reach financial independence, while saving 50% cuts it to roughly 17, and 65% to around 10. The reason is twofold: a higher savings rate builds the portfolio faster and simultaneously means you need a smaller one, because you already live on less.
What is Coast FIRE?
Coast FIRE is the point where your current portfolio, left completely alone with no further contributions, will still grow into your full FIRE number by your traditional retirement age. Once you hit it you no longer have to save for retirement — you only need to earn enough to cover today’s expenses while your investments coast. This calculator shows your Coast FIRE number and whether your portfolio has already reached it.
Is the 4% rule reliable for early retirement?
It is a useful starting point, not a guarantee. The 4% rule was built for a 30-year horizon and assumes a stock-and-bond mix; a 40-to-50-year early retirement faces more sequence-of-returns risk, where a bad market early on can permanently dent the portfolio. Many early retirees plan for a lower withdrawal rate, keep a cash buffer, or stay flexible on spending. Treat the output here as a planning estimate, not a promise.
Disclaimer: these calculators are educational tools, not financial advice. They model your inputs with published formulas, but they cannot know your full situation — for decisions with real stakes, talk to a qualified professional. Formulas and defaults last reviewed .