FIRE Number Calculator
Last verified · Methodology
Find the portfolio size that makes work optional, see how many years it takes at your current savings rate, and compare what different withdrawal rates do to the target.
Your numbers
In today's dollars. This is the single biggest driver of your FIRE number.
Real return used in the math: 3.88%
Your FIRE number
$1,500,000
You reach it in 24.3 years, at age 56, contributing $2,500 per month at a 3.88% real return.
8.0% of the way there
Spending multiple
25x
At a 4% withdrawal rate
Still needed
$1,380,000
From $120,000 today
Path to your FIRE number
Green is your projected balance. The flat line is your target.
FIRE number by annual spending
| Annual spending | At 4% (25x) | At 3.5% (29x) |
|---|---|---|
| $30,000 | $750,000 | $857,143 |
| $40,000 | $1,000,000 | $1,142,857 |
| $50,000 | $1,250,000 | $1,428,571 |
| $60,000 | $1,500,000 | $1,714,286 |
| $80,000 | $2,000,000 | $2,285,714 |
| $100,000 | $2,500,000 | $2,857,143 |
| $150,000 | $3,750,000 | $4,285,714 |
What is a FIRE number?
Your FIRE number is the amount invested that lets you stop working. It is the portfolio that can cover your annual spending indefinitely through withdrawals, without needing a paycheck. Everything else in the financial independence movement is downstream of this single figure.
The calculation is deliberately simple. Annual spending divided by a safe withdrawal rate. The complexity lives in the two inputs, not in the formula, and both of them are estimates about a future you cannot observe.
How to calculate your FIRE number
$60,000 ÷ 0.04 = $1,500,000
The 25x shorthand you see everywhere is just the 4% rule expressed as a multiple. One divided by 0.04 is 25. At a 3.5% withdrawal rate the multiple becomes 29x. At 3% it is 33x.
Getting annual spending right
Use expected spending in retirement, not current income and not current spending. The two common errors run in opposite directions. People forget that healthcare before Medicare eligibility can run $15,000 to $25,000 per year for a couple, and they forget that commuting, payroll taxes, and retirement contributions all disappear once they stop working.
Withdrawal rate: the assumption that moves everything
| Withdrawal rate | Multiple | Needed for $60k/yr | Typical use |
|---|---|---|---|
| 3.0% | 33x | $2,000,000 | Retiring in your 30s, 50+ year horizon |
| 3.5% | 29x | $1,714,286 | Retiring in your 40s, common FIRE default |
| 4.0% | 25x | $1,500,000 | Classic 30 year retirement |
| 5.0% | 20x | $1,200,000 | Aggressive, assumes flexibility to cut spending |
The gap between 4% and 3.5% on a $60,000 budget is $214,000, which for most savers is three to five additional working years. That is the real cost of the assumption, and it is why the choice deserves more thought than it usually gets.
Variations on the FIRE number
Not everyone is aiming at the same target. The common variants change the spending input rather than the formula.
- Lean FIRE: $25,000 to $40,000 per year, so roughly $625,000 to $1,000,000 at 25x. See the Lean FIRE calculator.
- Regular FIRE: $50,000 to $80,000 per year, the median target.
- Fat FIRE: $100,000 or more per year, so $2.5 million and up.
- Coast FIRE: not a smaller number, but an earlier milestone. Enough invested that growth alone reaches the full number. See the Coast FIRE calculator.
- Barista FIRE: a partial number, where part-time income covers the rest. See the Barista FIRE calculator.
Two levers that move the target
Once you know the target, the two levers are savings rate and time. Check what percentage of income you are actually saving with the savings rate calculator, which converts that rate directly into years to independence. Then model the accumulation with the compound interest calculator or the retirement calculator.
Your FIRE number is the size of the investment portfolio that can fund your living expenses indefinitely without earned income. It is calculated by dividing your desired annual spending by your safe withdrawal rate. At the classic 4% rate, that works out to 25 times annual spending, so someone who wants $60,000 per year needs $1,500,000.
Take your expected annual spending in retirement and divide it by your withdrawal rate as a decimal. For $60,000 of spending at a 4% withdrawal rate: $60,000 divided by 0.04 equals $1,500,000. Use the spending you actually expect, not your current income. Housing, healthcare, and travel are the three line items people most often get wrong.
The 25x shorthand comes from the 4% rule, which was derived from the Trinity Study of US market data from 1926 to 1995. It held up in roughly 95% of 30 year historical periods with a 50/50 stock and bond portfolio. It is a reasonable planning anchor, not a guarantee. Retirements longer than 30 years, sequence of returns risk, and higher current valuations are the main reasons many planners now prefer 3.25% to 3.5%, which means 29x to 31x spending.
For a 30 year retirement starting in your sixties, 4% remains defensible. For an early retirement of 40 to 50 years, most careful analyses suggest 3.25% to 3.5%. The difference is large: at $60,000 of spending, 4% needs $1.5 million while 3.25% needs $1.85 million. Lowering the rate by three quarters of a point can add years of work, which is why the assumption deserves real thought rather than defaulting to 4%.
No. The FIRE number covers investable assets that generate withdrawals. Your primary residence does not produce income, and you cannot spend it without selling or borrowing against it. Count retirement accounts, taxable brokerage, and any income-producing property equity you would actually liquidate. If you own your home outright, reflect that in lower annual spending instead, since you have no rent or mortgage payment.
Express spending in today's dollars and use a real return, meaning return after inflation. The calculator above does this by taking your nominal return and inflation assumption separately and converting them. The FIRE number itself then stays in today's purchasing power, which is far easier to reason about than trying to project a nominal dollar figure 25 years out.
Retirement Calculator
Project your nest egg, see inflation-adjusted values, and find your monthly savings target.
Compound Interest Calculator
Estimate future value with recurring contributions and compounding.
Investment Calculator
Project stock market returns with S&P 500, NASDAQ, or 60/40 presets. Includes a withdrawal phase with inflation adjustment.