Types of FIRE: Lean, Barista, Coast, and Fat FIRE, defined

The one formula behind every type of FIRE

Before the labels, the math they all share. Your FI number — the invested amount that makes work optional — is your annual spending divided by a safe withdrawal rate:

FI number = annual spending ÷ safe withdrawal rate

At the common 4% withdrawal rate, that's spending × 25. Spend $40,000 a year and your FI number is $1,000,000; spend $100,000 and it's $2,500,000. Every "type of FIRE" below is just this formula aimed at a different spending number, sometimes with a side plan (part-time work, or letting existing investments coast) for closing the gap. If you want the formula in depth, see what is your FI number; for why the 4% rate is a starting assumption you should set on purpose, see the 4% rule and safe withdrawal rate.

That's the honest through-line: the labels are lifestyle choices; the math is the same. Which is also why a single calculator with an editable target spend can model all of them.

The types of FIRE at a glance

Here is the whole family in one table. The commonly-cited annual-spend ranges come from the FIRE community and vary by source (they're conventions, not official cutoffs); the FI numbers are computed with the calculator's exact spending ÷ 4% math so you can check every row.

Two of these — Lean, Regular, Fat — are about how much you spend. The other two — Barista, Coast — are about how you cover the gap on the way there. That's the cleanest way to hold the whole family in your head. Let's take them one at a time.

Lean FIRE

Lean FIRE is reaching financial independence on a deliberately low budget — commonly cited as under about $40,000 a year in spending — so your FI number, and the time to reach it, are smaller. It's early retirement optimized for a frugal, intentional lifestyle: a paid-off or cheap home, cooking from scratch, sometimes geographic arbitrage (living somewhere with a lower cost of living).

The appeal is speed and reachability. At a 4% withdrawal rate:

• $25,000/yr spending → FI number $625,000
• $30,000/yr spending → FI number $750,000
• $40,000/yr spending → FI number $1,000,000

The trade-off is margin. A leaner budget has fewer places to cut if markets fall or life throws a surprise, which makes the order of good and bad market years — and a genuinely conservative withdrawal rate — matter more, not less. Lean FIRE isn't "cheaper FIRE"; it's FIRE with a thinner cushion, and it works best when your low spending is a choice you're happy with rather than a number you're forcing.

See your own lean target with the Lean FIRE calculator — enter a frugal budget and get your FI number and date.

Regular FIRE (the middle of the road)

Regular FIRE — sometimes just "FIRE" — is the standard version: enough invested to cover a typical middle-class budget, commonly cited in the ~$40,000–$80,000/yr range, entirely from your portfolio. No frugality vow, no luxury target — you fully retire and live off withdrawals.

At 4%:

• $50,000/yr spending → FI number $1,250,000
• $60,000/yr spending → FI number $1,500,000
• $80,000/yr spending → FI number $2,000,000

Most of the original 4%-rule research was built around roughly this profile and a ~30-year retirement. If you're retiring decades early, the same budget needs a more cautious withdrawal rate (and therefore a bigger number) — that's the 3.25–3.5% early-retirement adjustment.

Fat FIRE

Fat FIRE is reaching financial independence without shrinking your lifestyle — commonly pegged at $100,000+/yr in spending, which puts the FI number at $2.5M and up (often $3M+). It's the opposite of Lean: you're not optimizing for frugality, you're optimizing for a comfortable-to-luxurious retirement, which usually means the harder problem is growing income and savings high enough to get there.

At 4%:

• $100,000/yr spending → FI number $2,500,000
• $120,000/yr spending → FI number $3,000,000
• $160,000/yr spending → FI number $4,000,000

Fat FIRE buys the biggest cushion — there's a lot of discretionary spending you could trim in a downturn — but it also asks the most of your accumulation years. It's less a different math and more a different income problem.

Price out a higher-spending budget with the Fat FIRE calculator, or the comfortable middle band with the Chubby FIRE calculator.

Barista FIRE

Barista FIRE is semi-retirement: you save enough that your portfolio covers most of your spending, and a flexible part-time job — the classic example being a coffee-shop role, sometimes taken for the health benefits — covers the rest. Because your investments only have to fund part of your budget, your FI number is smaller than full FIRE.

Here's the math, worked. Say your annual spending is $60,000. Full FIRE would need $60,000 ÷ 4% = $1,500,000. But if a part-time job reliably brings in $25,000/yr, your portfolio only has to cover the remaining $35,000:

• Barista FI number = $35,000 ÷ 4% = $875,000
• vs. full FI number = $1,500,000

That part-time income cuts the portfolio target by $625,000 — a huge shortcut — in exchange for keeping some earned income (and often, in the US, employer health insurance, which is a major pre-Medicare line item). The catch is that Barista FIRE depends on that part-time income actually showing up: if the job or the benefits disappear, your real FI number snaps back toward the full figure. Model the portfolio-funded portion, not the whole budget, and keep an eye on what happens if the paycheck stops.

The Barista FIRE calculator shows how much part-time income cuts the portfolio you need.

Coast FIRE

Coast FIRE is the point where you've invested enough that compound growth alone — with no further contributions — should reach your full FI number by your target retirement age. You still work to cover today's bills, but you're done saving for retirement. Unlike Barista FIRE (where a paycheck covers part of spending), Coast FIRE is about a paycheck covering all of today's spending while your existing investments grow untouched.

The number you need today to coast is your full FI number discounted back by expected growth:

Coast FIRE number = FI number ÷ (1 + real return)^(years to your target age)

For example, a 35-year-old targeting a $1,000,000 FI number by 65, at a 5% real return, needs about $231,377 invested today to coast the rest of the way. Because Coast FIRE has its own formula, calculator, and by-age table, we give it a full treatment on its own page: Coast FIRE calculator: what it is and your Coast FIRE number.

Coast FIRE vs Barista FIRE — the difference people mix up

Both let you ease off before full financial independence, but they cover the gap differently: with Coast FIRE your job covers all of today's spending while investments grow untouched; with Barista FIRE your portfolio covers most of your spending and part-time work fills the shortfall.

• Coast FIRE: retirement is already funded by future growth. You've stopped saving, but you still earn enough to pay 100% of current expenses. Nothing is withdrawn from the portfolio yet.
• Barista FIRE: you've started leaning on the portfolio for part of your spending now, and a part-time job covers the remainder. It's a form of partial early retirement.

In plain terms: Coast FIRE means "I don't need to save anymore, but I still work full-ish." Barista FIRE means "I've mostly retired, and a small job tops me up." Many people pass through Coast FIRE on the way to Barista or full FIRE.

The numbers behind each type of FIRE (proprietary table)

Here's every variant priced out with the calculator's exact math, at example spending levels, showing both the full FI number (spend ÷ 4%) and the Coast FIRE number a 35-year-old would need today to reach that figure by 65 at a 5% real return (FI ÷ 1.05³⁰). Every figure is an estimate in today's dollars.

Full FI = spend ÷ 0.04; Coast = FI ÷ 1.05³⁰ where 1.05³⁰ ≈ 4.32194. Barista FIRE isn't a single portfolio number — it's your full FI minus whatever a part-time paycheck covers; see the worked example above.

Read down the "full FI number" column and the whole point lands: the type of FIRE you're chasing is set almost entirely by the spending you plan for. Trim $20,000 of permanent annual spending and, at 4%, your target drops by $500,000.

Same saver, three types of FIRE — what changes the timeline

Because the only thing that really changes between Lean, Regular, and Fat FIRE is the target spend, the same saver hits each one years apart. Take one person and point them at three different budgets. All figures use the calculator's exact years-to-FI math and are estimates in today's dollars, not predictions.

Inputs: age 30 · $50,000 invested · $30,000/yr contributions · 5% real return · 4% withdrawal rate.

Same income, same savings, same market assumption — and the finish line moves by 14 years between Lean and Fat. That's the real lever behind all the labels: not a secret strategy, just how much future spending you're funding. (Years-to-FI uses the closed form n = ln[(T·r + C) ÷ (P·r + C)] ÷ ln(1 + r); run your own at fimanager.app/fi-calculator.)

Which type of FIRE is right for you?

There's no "best" type of FIRE — the right one is a match between the lifestyle you actually want and the number you can realistically reach. A few honest prompts instead of a prescription:

• Start from real spending, not a label. Track what your life actually costs, then see which range you land in. The label follows the number, not the other way around.
• Lean fits if a frugal life genuinely appeals and you value time over stuff — just build in margin, because a thin budget has less room to flex in a downturn.
• Fat fits if you'd rather not cut your lifestyle and the bottleneck is income; the accumulation years do the heavy lifting.
• Barista fits if full retirement feels far off but you'd take a lower-stress part-time role (especially for benefits) to get most of the way there now.
• Coast fits if you've front-loaded saving and want to stop contributing and breathe, while still covering today's bills. See the Coast FIRE calculator.

Whatever you pick, the same caution applies to all of them: a single FI number assumes a smooth, average return every year, and real markets don't cooperate. When the bad years hit matters as much as the average — sequence-of-returns risk — which is why the honest next step past any of these targets is a chance-of-success simulation that stress-tests your plan against thousands of market histories, with every assumption visible. Because if you can't see what a projection assumes, you can't trust what it tells you.

FAQ

What are the different types of FIRE?

The main types are Lean FIRE (frugal early retirement, commonly under ~$40,000/yr spending), Regular FIRE (a typical budget, ~$40,000–$80,000/yr), Fat FIRE (no lifestyle cuts, ~$100,000+/yr), Barista FIRE (part-time work covers part of spending), and Coast FIRE (you stop saving and let existing investments grow to your FI number). They're community terms, not standardized categories.

What is Lean FIRE?

Lean FIRE is reaching financial independence on a deliberately low budget — often cited as under about $40,000 a year — so your FI number and the time to get there are smaller. At a 4% withdrawal rate, $30,000/yr spending means a $750,000 FI number. The trade-off is a thinner cushion if markets or life surprise you.

What is Fat FIRE?

Fat FIRE is early financial independence without cutting your lifestyle, commonly pegged at $100,000+/yr in spending — a $2.5M+ FI number at 4%, often $3M or more. It's the opposite of Lean FIRE; the main challenge is usually growing income and savings high enough to reach it.

What is Barista FIRE?

Barista FIRE is semi-retirement where your portfolio covers most of your spending and a flexible part-time job (often kept for health benefits) covers the rest. Because investments only fund part of your budget, the FI number is smaller: if part-time work covers $25,000 of a $60,000 budget, your portfolio only needs to fund $35,000 — an $875,000 target at 4% instead of $1,500,000.

What is Coast FIRE?

Coast FIRE is the point where you've invested enough that compound growth alone — with no further contributions — should reach your full FI number by your target retirement age. You still work to cover current expenses but no longer save for retirement. See the Coast FIRE calculator for the formula and your number.

Coast FIRE vs Barista FIRE — what's the difference?

With Coast FIRE, your job covers all of today's expenses while your investments grow untouched toward retirement — you've stopped saving but haven't started withdrawing. With Barista FIRE, your portfolio already covers most of your spending now and part-time work fills the gap. Coast = "done saving, still working"; Barista = "mostly retired, small job tops me up".

How much money do you need for each type of FIRE?

It depends entirely on your target spending, because FI number = annual spending ÷ withdrawal rate. At 4%: Lean FIRE roughly $625,000–$1,000,000, Regular FIRE roughly $1,000,000–$2,000,000, Fat FIRE $2,500,000+. Barista FIRE is lower because part-time income covers part of the budget; Coast FIRE needs a smaller amount today that grows to your full number later.

Which type of FIRE is best?

None is universally best — the right one matches the lifestyle you actually want with a number you can realistically reach. Start by tracking your real spending, see which range it falls in, and build in margin for bad market years. The label follows the number.

Are the FIRE spending thresholds official?

No. Lean, Fat, Barista, and Coast FIRE are terms that grew out of online FIRE communities, and different sources use slightly different dollar cutoffs. Treat the ranges as conventions for conversation, not rules — the only hard math is your own spending divided by your chosen withdrawal rate.

A calculator for every type of FIRE

Each variant is the same FI math at a different target — pick the one that matches the life you're planning for.

• What is your FI number? →The formula, the 4% rule, and worked examples behind every number here.
• FI calculator →Your core FI number and a rough date to financial independence.
• Coast FIRE calculator →The smaller amount that grows to full FI on its own — stop saving, keep coasting.
• Barista FIRE calculator →How steady part-time income shrinks the portfolio you need to semi-retire.
• Lean FIRE calculator →Reach financial independence sooner on a deliberately frugal budget.
• Fat FIRE calculator →Fund a no-compromises, higher-spending early retirement.
• Chubby FIRE calculator →The comfortable middle band between lean and fat FIRE.