Lean FIRE, Fat FIRE, Barista FIRE and Coast FIRE compared
The FIRE movement has grown its own vocabulary. You will see Lean FIRE, Fat FIRE, Barista FIRE and Coast FIRE in forums, podcasts and calculators. They are not official categories and nobody polices the definitions, but they are useful shorthand for different trade-offs between how much you save, how much you spend and whether you keep working. This guide lays them out side by side with example numbers, so you can decide which — if any — matches your goals.
The common foundation
Every variant uses the same arithmetic. Your FIRE number is the annual spending your portfolio must cover, divided by a withdrawal rate. At 4% that is 25× spending. The variants differ only in how much spending they assume and whether some income continues. You can test any of them with the FIRE number calculator.
At a glance
| Variant | Typical idea | Example spending | Example target at 4% |
|---|---|---|---|
| Lean FIRE | Full independence on a frugal budget | $30,000 | $750,000 |
| Regular FIRE | Full independence on a typical budget | $55,000 | $1,375,000 |
| Fat FIRE | Full independence on a generous budget | $120,000 (at 3.5%) | about $3,428,571 |
| Barista FIRE | Portfolio covers part; part-time work covers the rest | $55,000 with $25,000 earned | $750,000 |
| Coast FIRE | Enough invested to grow to full FIRE later without new contributions | Depends on years left | e.g. $231,377 for a $1M target 30 years away at 5% real |
The spending levels are illustrations, not definitions. A “lean” budget in a low-cost town may be a comfortable one, and a “fat” budget in an expensive city may feel ordinary.
Lean FIRE
What it is: reaching full financial independence with spending well below the national typical household. People pursuing Lean FIRE often combine a very high savings rate with low housing costs, minimal car use and inexpensive hobbies.
Advantages: the target is smaller, so it can be reached sooner. Habits built while saving tend to carry into retirement.
Risks: there is little room to cut if markets fall, and unexpected costs — health care, home repairs, family needs — take a bigger share of the budget. Because the margin is thin, many Lean FIRE planners use a lower withdrawal rate or keep some optional income.
Fat FIRE
What it is: financial independence with a generous budget that includes travel, larger housing, or supporting family. Fat FIRE targets are often several million dollars.
Advantages: a large budget has built-in flexibility. If markets fall, cutting discretionary travel or dining still leaves a comfortable life, which effectively lowers sequence-of-returns risk.
Risks: the target takes longer to reach, usually requiring a high income as well as a high savings rate. Taxes on large withdrawals deserve careful planning.
Barista FIRE
What it is: leaving full-time work once your investments can cover the share of spending that part-time or flexible work does not. The name refers to the idea of working part-time at a coffee chain that offers benefits, but it covers any semi-retirement: freelancing, consulting, seasonal work or a lower-stress job.
Advantages: much smaller portfolio needed — every $1,000 of reliable yearly income lowers the target by $25,000 at 4%. Part-time income also cushions bad market years, and some people value the structure and social contact.
Risks: part-time work can be less secure, and health insurance can be expensive before Medicare. Use the Barista FIRE calculator and test what happens if the income falls.
Coast FIRE
What it is: having enough invested that, with no further contributions, it could grow into your full FIRE number by a later retirement age. You keep working to pay current bills but no longer need to save for retirement on these assumptions.
Advantages: a near-term, reachable milestone for younger savers; it can justify a career change, part-time work or a break.
Risks: it depends heavily on the return assumption and on decades of compounding. A poor decade can undo a “coast”. See What is Coast FIRE? and the calculator.
How the variants combine
In practice many people move through several stages. A common path is:
- Save hard early until reaching Coast FIRE.
- Keep working full-time a little longer to build a buffer, or switch to more enjoyable work.
- Reach the Barista FIRE number and reduce hours.
- Reach full FIRE — lean, regular or fat — or simply reach traditional retirement age with a well-funded portfolio.
Thinking in stages turns one huge target into several smaller ones, each with a clear decision attached.
Choosing your path
Questions that help:
- Do you want to stop working entirely, or just work differently? If the latter, Barista or Coast FIRE may fit better than Lean.
- How flexible is your budget? A budget with lots of discretionary spending can absorb bad years; a lean one cannot.
- How secure is your health coverage? Retiring before 65 means planning for insurance. See our health insurance guide.
- How long is your horizon? Longer retirements argue for lower withdrawal rates; see the 4% rule guide.
- Do you need access to retirement accounts early? See accessing money before 59½.
Calculating your own numbers
Start with real spending from your statements. Then:
- Use the FIRE number calculator for full FIRE at your chosen budget.
- Enter expected part-time income in the Barista calculator.
- Use the Coast FIRE calculator with your age and target retirement age.
- Use the years-to-FI calculator to see how your savings rate affects each timeline.
A note on labels
Labels can be motivating, but they can also create pressure to fit a box. The arithmetic is the same whichever label you use. What matters is whether your plan covers your real spending with an adequate margin, and whether the path there is one you can live with.
Quick scenario check
Try this with the calculators: take your current spending, then build a lean version (essentials only) and a comfortable version (with travel and hobbies). Run both through the FIRE number calculator and compare the years each takes on the years-to-FI calculator. The gap between them is often smaller in years than people expect.
Summary
Lean, Fat, Barista and Coast FIRE are different combinations of spending, saving and continued work. Lean is smaller but fragile, Fat is robust but slow, Barista trades some work for a smaller target, and Coast lets compounding finish the job. Run your numbers for each and choose the trade-offs that suit you. This guide is educational, not financial advice.