FIRE Number Calculator
How much do you need to retire early? Your FIRE number is the nest egg that lets your investments cover your life — 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 — at a 4% withdrawal rate — so work becomes optional. It's your annual spending ÷ your withdrawal rate.
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 your 4% withdrawal rate. 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 for good — 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)
It's a single division: your expected annual spending ÷ your safe withdrawal rate.
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). The calculator lets you toggle between them.
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 so that safe withdrawals from it can cover your living expenses indefinitely — 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: FIRE number = annual spending ÷ withdrawal rate.
What is the 4% rule?
The 4% rule is a rule of thumb from the "Trinity study" suggesting that withdrawing about 4% of your portfolio in the first year of retirement — then adjusting for inflation — has historically lasted 30+ years for a stock/bond mix. A 4% withdrawal rate is the same as needing 25× your annual spending. It's a helpful starting point, not a guarantee: a long retirement, poor early returns, taxes, or high inflation can all argue for a lower, safer rate like 3–3.5%.
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 the 4% rule). Same math, different spending — this calculator shows all three so you can see where you fall.
How is a FIRE number calculated?
Divide your expected annual retirement spending by your withdrawal rate. At the 4% rule, $40,000 of annual spending ÷ 0.04 = a $1,000,000 FIRE number (the same as multiplying spending by 25). Choosing a safer 3.5% or 3% withdrawal rate raises the number ($1.14M and $1.33M respectively for the same $40,000). If you add your current savings and expected return, this calculator 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.
Try LifeFlow free