Coast, Barista, or Full FIRE — Find Your Real Number

If you've started researching Financial Independence, Retire Early (FIRE), you've probably run into something confusing: FIRE isn't one goal — it's three. Full FIRE, Coast FIRE, and Barista FIRE each require a different savings target, timeline, and strategy. Aim for the wrong one, and you'll either oversave for years longer than necessary, or retire without enough income to actually cover your life.

This guide breaks down all three, with the exact math behind each — and a free calculator for every step.

The Three FIRE Numbers, Side by Side

To make these comparable, here's one consistent example used throughout this post: $60,000 in annual expenses, a 4% withdrawal rate, 30 years until traditional retirement age, a 7% expected return, and $20,000/year in assumed part-time income for the Barista FIRE scenario.

Type	What It Requires	Number Needed (this example)
Full FIRE	100% of expenses from withdrawals, no work at all, starting now	$1,500,000
Coast FIRE	Stop contributing, keep working full-time, let it grow untouched to the Full FI number by retirement age	$197,051 (needed today)
Barista FIRE	Part-time income covers part of expenses, portfolio covers the rest, starting now	$1,000,000

Notice how different these numbers are for the exact same lifestyle. Coast FIRE's number is dramatically smaller because it has 30 years of compounding left to do the work — you're not touching it, just letting it grow. Barista FIRE and Full FIRE both require money you can withdraw starting today, which is why they're both much larger than the Coast number.

Full FIRE: The Complete Number

Full FIRE means covering 100% of your expenses through investment withdrawals alone, indefinitely, with no work required at all. It's calculated as your annual expenses divided by your withdrawal rate — at a 4% rate, that's the same as the widely used 25x rule (25 × annual expenses).

Coast FIRE: Let Compounding Finish the Job

Coast FIRE asks a different question: if you stopped contributing today, would what you already have grow into your full FI number by the time you reach traditional retirement age, purely through compound growth? If yes, you've "coasted" — you can keep working (since you still need income to live on today), but you no longer need to save anything more for retirement specifically.

This number is almost always the smallest of the three, because it has the most time working in its favor. It's the easiest one to reach first for most people already saving consistently in their 20s or 30s.

Barista FIRE: Downshift Now, Not Someday

Barista FIRE means your portfolio doesn't need to cover everything — just the gap between part-time or lower-stress income and your actual expenses. The name comes from a real strategy: taking part-time work at a company like Starbucks specifically for the health insurance benefits, while withdrawals cover the rest.

Unlike Coast FIRE, Barista FIRE requires a portfolio large enough to fund real withdrawals starting immediately — which is why it usually takes longer to reach than Coast FIRE, even though it requires less than Full FIRE.

The Math Underneath All Three: Rule of 72

Every one of these numbers depends on the same underlying force: how fast your money doubles. The Rule of 72 is the quick mental-math version — divide 72 by your expected return to estimate years to double. At 7%, that's roughly 10.3 years. Understanding this shortcut makes it much easier to sanity-check any of the three FIRE timelines above.

Reverse-Engineering Your Plan

Once you know your target number, the next question is usually either "what do I need to contribute monthly?" or "how long will this actually take me?" Rather than guessing, solve for whichever one you don't already know.

Seeing the Whole Road, Not Just the Destination

A single target date can be misleading — it hides how slow the early years feel and how fast the later years move once compounding takes over. Seeing a full year-by-year table, with contributions and growth broken out separately, makes the "slow start, fast finish" pattern of any FIRE plan much easier to actually believe.

The Silent Threat to Any FIRE Plan: Fees

None of these numbers account for what fees quietly do to a portfolio over decades. A fee that looks small each year — even just 1% — is charged on your entire balance every single year, compounding against you the same way returns compound for you. Over a 20-30 year FIRE timeline, that difference can add up to years of extra work that fees alone caused.

Which Path Actually Fits You?

Frequently Asked Questions

Which FIRE type should I aim for?

If you dislike your job and want out of full-time work as soon as possible, Barista FIRE usually gets you there fastest. If you like your job but want the security of knowing you could stop saving anytime, Coast FIRE fits. If you want complete freedom from any work requirement, Full FI is the target — but it takes the longest to reach.

Can I switch between FIRE types as my plan changes?

Yes — many people start planning around Coast FIRE, shift to Barista FIRE once they're close, and some eventually keep growing toward Full FI even after reaching an earlier milestone. The numbers aren't mutually exclusive; they're checkpoints along the same path.

Do all three approaches use the same withdrawal rate?

They can, though the safe withdrawal rate you choose matters more the longer your retirement horizon is. A 4% rate is the most commonly used starting point across all three, but some planners use 3-3.5% for extra safety margin on longer timelines.

What's the single biggest factor in reaching any FIRE number faster?

Starting early. The same monthly contribution invested for an extra decade can more than double your final balance, since most of the growth in any long-term investment comes from compounding, not just the money you put in.

The Bottom Line

FIRE was never one number — it's a family of related targets, each trading off timeline against how much work you're still willing to do along the way. Pick the one that actually matches what you want your life to look like, not just the one that sounds the most impressive.