FIRE Number Calculator
How much do you need to retire early? Your FIRE number is the nest egg that covers your annual spending — so work becomes optional. Enter your annual spending and a withdrawal rate to find it, and see how close you already are.
$1,000,000
That's the nest egg that lets your investments cover your $40,000 of yearly spending — so work becomes optional. A 30-year plan draws at 4% a year, so your number is 25× your spending.
If your current investments keep growing at 5% with no further contributions, they'd reach it in ~33 years — around age 68. Adding regular contributions gets you there sooner (see the savings rate calculator).
FIRE number
$1.00M
Annual spending
$40k
Years to reach
~33
Estimates, not financial advice. The 4% rule is a useful rule of thumb from historical U.S. data, not a guarantee — sequence of returns, inflation, taxes, and a long retirement can all shift the safe number. A lower withdrawal rate (3–3.5%) is more conservative. Use this as a starting point.
Where you fall: Lean / FIRE / Fat
Rough shorthand by lifestyle, at the same 4% this page applied to your own number. Your spending puts you in the highlighted tier.
$750k
~$30k/yr · Frugal, streamlined living
$1.50M
~$60k/yr · A comfortable middle
$3.00M
~$120k/yr · Room for a richer lifestyle
Your $200,000, growing toward your FIRE number
This is one number. See your whole picture.
Your FIRE number is the target. LifeFlow shows your real freedom year — the moment your plan crosses it — with your goals and the life you want now, all in one warm, living plan.
Try LifeFlow freeWhat is a FIRE number?
Your FIRE number is the amount you need invested so that safe withdrawals from your portfolio can cover your living costs — the point of financial independence, where paycheck and lifestyle are no longer tied together. FIRE stands for Financial Independence, Retire Early, and this one number is the target the whole journey aims at.
How it's calculated (and the 4% rule)
Your FIRE number is your expected annual spending set against a safe withdrawal rate. The calculator asks which way you want to set that rate, and says which one it used.
By withdrawal rate FIRE number = annual spending ÷ your rate (e.g. $40,000 ÷ 4% = $1,000,000)
A 4% withdrawal rate is the same as needing 25× your annual spending. The 4% rule comes from historical market data and is a solid starting point — but it isn't a promise. For a long or early retirement, many people use a more conservative 3.5% or 3% (a bigger number, more margin) — pick one in By withdrawal rate mode. Or leave the calculator in By plan length and give it your ages instead: the rate then follows how long the money has to last, and the page tells you which rate that worked out to.
FIRE number vs Coast FIRE
These two go together but answer different questions. Your FIRE number is how much you ultimately need. Coast FIRE asks whether you already have enough invested that, with no further contributions, compounding alone carries you to that number by your target age. Set your target here, then head to the Coast FIRE calculator to see if you can stop contributing and coast the rest of the way.
Frequently asked questions
What is a FIRE number?
Your FIRE number is the total amount you need invested for safe withdrawals from it to cover your living expenses — the nest egg at which work becomes optional (FIRE = Financial Independence, Retire Early). It's calculated from your expected annual spending and a safe withdrawal rate. This calculator lets you set that rate two ways: BY PLAN LENGTH, where the rate follows how long the money has to last, or BY WITHDRAWAL RATE, where you pick it yourself and the number is annual spending ÷ that rate. The safe-withdrawal research behind these rates is based on 30-year retirements, so treat your FIRE number as a starting point rather than a promise about how long the money lasts.
What is the 4% rule?
The 4% rule is a rule of thumb from the "Trinity study": withdrawing about 4% of your portfolio in the first year of retirement, then adjusting for inflation. It describes a worst case in one historical record, not a success rate — across Bengen's 1926–1976 starting years, the earliest any portfolio ran out at 4% was 33 years in, which makes 4% the floor of what was observed rather than a probability that your money lasts. It also assumes 50–75% of the portfolio in stocks, a mix this calculator never asks you for. A 4% withdrawal rate is the same as needing 25× your annual spending. It's a starting point, not a guarantee: a long retirement, poor early returns, taxes, or high inflation all work against it.
What is the difference between Lean FIRE, FIRE, and Fat FIRE?
They're informal labels for lifestyle level. Lean FIRE means retiring on a lean, frugal budget (often under ~$50k/year, so a smaller nest egg). Regular FIRE is a comfortable middle. Fat FIRE means retiring with a generous budget (often $100k+/year, requiring a much larger portfolio — $2.5M or more at a 4% rate, and more at a gentler one). Same math, different spending — this calculator shows all three at whatever rate it applied to your own number, so you can see where you fall.
How is a FIRE number calculated?
Two ways, and this calculator does both. BY WITHDRAWAL RATE: divide your expected annual retirement spending by a rate you pick. At 4%, $40,000 ÷ 0.04 = a $1,000,000 FIRE number (the same as multiplying spending by 25), and choosing a safer 3.5% or 3% raises it to $1.14M or $1.33M. BY PLAN LENGTH (the default): you give the ages instead, and the rate follows how long the money has to last — about 4% over 30 years, gentler over a longer plan and higher over a shorter one. The page states the rate it used either way. If you add your current savings and expected return, it also estimates how many years until your investments reach the number.
FIRE number vs Coast FIRE — what's the difference?
They answer different questions. Your FIRE number is HOW MUCH you ultimately need invested to be financially independent. Coast FIRE asks whether you already have enough invested that, with NO further contributions, compound growth alone will reach that number by your retirement age. So you use the FIRE number to set the target, and Coast FIRE to check whether you can stop saving and simply coast to it. They're complementary — most people calculate their FIRE number first, then check their Coast FIRE progress.
This is one number. See your whole picture.
These calculators are snapshots. LifeFlow shows your real freedom year, the goals and the life you want now, and how every dollar moves your future — in one warm, living plan.
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