Lean vs Fat vs Barista FIRE
The FIRE variants differ on two things: how much you spend, and whether you keep working. Lean FIRE funds a frugal life and needs the least — about $625,000 for $25,000 a year. Fat FIRE funds a comfortable one and needs the most — around $3,000,000 for $120,000 a year. Barista FIRE is the odd one out: you keep a part-time job, so your portfolio only covers the gap that income leaves. All three run on the same 25x rule; they just point it at different lifestyles.
The short answer
All three are flavours of financial independence built on the same 25x rule — portfolio equals annual expenses times 25, from the 4 percent withdrawal rate. What separates them is lifestyle and working status:
- Lean FIRE — a frugal life on roughly $25,000 to $40,000 a year, needing about $625,000 to $1,000,000.
- Fat FIRE — a comfortable life on $100,000 a year or more, needing $2,500,000 and up.
- Barista FIRE — semi-retirement, where part-time income covers some expenses so the portfolio funds only the rest.
Find your own number: the FIRE calculator turns any spending level into a target, whichever variant you are aiming for.
The three at a glance
Here is a typical spending level for each, with the portfolio it implies at the 25x rule:
| Variant | Typical annual spend | Portfolio (25×) | Still working? |
|---|---|---|---|
| Lean FIRE | $25,000 | $625,000 | No |
| Regular FIRE | $50,000 | $1,250,000 | No |
| Fat FIRE | $120,000 | $3,000,000 | No |
| Barista FIRE | $50,000 (less $20,000 part-time) | $750,000 | Part-time |
Notice Barista FIRE needs less than Regular FIRE for the very same $50,000 lifestyle — because $20,000 of it comes from a paycheck, not the portfolio. That is the whole idea.
Lean FIRE
Lean FIRE funds a deliberately frugal lifestyle. Keep annual spending to around $25,000 to $40,000 and the 25x rule puts your target between about $625,000 and $1,000,000 — the lowest bar of any full-retirement variant.
The appeal is speed: a smaller number is reached sooner. The trade-off is that it leaves little slack. A frugal budget has fewer places to cut when markets are poor, so lean retirees often keep a flexible plan or a small income buffer. See FIRE number by expenses for the full range of targets.
Fat FIRE
Fat FIRE is the opposite end: a comfortable or even luxurious retirement with no belt-tightening. Spending of $100,000 a year needs about $2,500,000, and $120,000 needs $3,000,000, rising from there.
Because the target scales directly with spending, Fat FIRE takes the longest to fund and usually relies on a high income and savings rate during the working years. The upside is a large margin of safety — there is plenty of room to trim in a downturn without touching your actual standard of living.
Barista FIRE
Barista FIRE breaks the mould. Instead of a portfolio that covers everything, you leave full-time work but keep a part-time job — the name nods to coffee-chain roles that come with health benefits. That income covers part of your expenses, so your portfolio only has to fund the gap.
Take a $50,000 lifestyle with $20,000 of part-time earnings. The portfolio covers the remaining $30,000, which at the 25x rule is about $750,000 — far below the $1,250,000 that full FIRE on the same spending would require. You reach independence sooner, at the cost of staying partly in the workforce. It sits close to Coast FIRE, the difference being that Barista income covers current expenses while Coast FIRE is about letting an existing balance grow untouched.
Which one fits you
There is no best version — only the one that matches the life you want and how soon you want out:
- Choose Lean FIRE if leaving work early matters more than a big budget, and you are comfortable living frugally.
- Choose Fat FIRE if you want a comfortable retirement with a wide safety margin and can fund the larger target.
- Choose Barista FIRE if you would happily keep working part-time in exchange for a far smaller portfolio and an earlier exit from the full-time grind.
Whichever you pick, the calculation is the same 25x rule — walk through it in how to calculate your FIRE number.
Assumptions
- The 25x rule, annual convention. Every target is annual expenses times 25, from the 4 percent withdrawal rate — defined yearly, unlike the monthly compounding used for growth math elsewhere on this site.
- Typical spend bands. The dollar figures are representative examples; your own target depends on your real expenses.
- Barista income is steady. The Barista example assumes reliable part-time earnings; if that stops, the portfolio must cover the full amount.
- A guideline, not a guarantee. The 4 percent rule is based on historical data and can require flexibility in poor markets.
Frequently asked questions
The bottom line
Lean, Fat and Barista FIRE are the same idea aimed at different lives. Lean minimises the number by minimising spending; Fat maximises comfort at the cost of a bigger target; Barista shrinks the portfolio by keeping a part-time paycheck. Pick the lifestyle first, and the 25x rule hands you the number.
Run yours in the FIRE calculator, or read what is FIRE for the strategy that ties them all together.
Disclaimer: This page is for general educational purposes only and is not financial advice. The 4 percent and 25x rules are historical guidelines, not guarantees; actual safe withdrawal rates vary with markets, inflation, taxes and how long a retirement lasts. Consider speaking with a qualified financial professional before making decisions about your own money.