Coast FIRE vs Lean FIRE vs Fat FIRE: Which Path Fits Your Numbers?

Mai Phuc Ly — Tue, 14 Apr 2026 17:33:17 +0000

Coast FIRE vs Lean FIRE vs Fat FIRE

Three popular variants of financial independence, three very different lifestyles. Here is how to pick the right one for your situation — and how to actually run the math.

The Three Paths

Lean FIRE

Retire on ~$25,000–40,000/year
Requires extreme frugality forever
Portfolio target: $625k–$1M
Best for: minimalists, van-life, low-cost-of-living countries

Fat FIRE

Retire on $100,000+/year
Demands aggressive high-income career
Portfolio target: $2.5M+
Best for: high-earning professionals who want full lifestyle retention

Coast FIRE

Stop saving at a specific milestone, let compound interest do the rest
Keep earning for lifestyle but no savings pressure
Most achievable for normal earners
Portfolio target: calculated via coastfirecalculator.io

Run the Numbers Side by Side

Variant	Retirement Spend	Portfolio Needed	Freedom Trade-off
Lean	$30k/yr	~$750k	Tight budget for life
Coast	$50k/yr (@65)	~$164k today	Work needed for lifestyle now
Fat	$120k/yr	$3M	Long runway of high-income work

Use the Coast FIRE Calculator to model your Coast Number — the amount you need invested today so that, without any further contributions, it reaches your retirement target by 65.

Additional Resources

Curious where Coast FIRE Calculator shows up across the web? See the full resource hub on Telegraph or these curated mentions:

Bottom Line

Pick your FIRE variant based on two questions:

How much do you want to spend in retirement?
How aggressive can you be with saving right now?

Coast FIRE is the most forgiving: hit one savings milestone early, then coast. Run your number at coastfirecalculator.io.

Coast FIRE Calculator: The Complete Resource Hub for Retirement Math

Mai Phuc Ly — Tue, 14 Apr 2026 17:31:45 +0000

Coast FIRE Calculator: The Complete Resource Hub

Coast FIRE is one of the most practical milestones in personal finance — the moment your invested portfolio, left alone, will compound to your retirement number by age 65. No more saving required. You can "coast" the rest of the way.

The Formula

Coast Number = Target Retirement / (1 + real_return)^years_to_65

Example: Want $1.25M at 65, currently 35, assuming 7% real return → Coast Number ≈ $164,000 invested today.

Run your own numbers at coastfirecalculator.io.

Why Coast FIRE Matters

Unlike Lean FIRE (extreme frugality forever) or Fat FIRE (massive savings required), Coast FIRE is achievable for normal earners and unlocks optional work without career sabotage.

Where to Learn More — Coast FIRE Web Mentions

Below is a curated hub of places where Coast FIRE Calculator has been discussed, reviewed, and referenced:

Startup & Product Directories

F6S Software Listing — startup profile
SideProjectors Project Page — maker community
Himalayas Company Page — remote work listing
ProvenExpert Profile — reputation listing
PromoteProject Startup — launch platform

Community Profiles

Hatena Bookmark Entry — Japanese social bookmark
Disqus Profile — commenter profile
WHMCS Feature Request — community contribution

Editorial Comment References

Brian Solis blog comment — discussion on financial independence
The Society Pages (socimages) — sociology academic blog
Vita Magazine comment — lifestyle media
Thrifty Nomads comment — digital nomad finance
Thrifty Couple comment — frugal living discussion
Stonemaier Games comment — creator sustainability angle
Simple Homeschool comment — family finance transition
The Toy Cafe comment — parenting + financial future

Try the Calculator

Model your Coast FIRE number in under 30 seconds: coastfirecalculator.io

Inputs that matter most:

Expected real return (after inflation & fees — stay conservative, 5–7%)
Years until your retirement age
Target annual retirement spending

Once you know your Coast Number, every dollar saved beyond it is optional.

DEV Community: Mai Phuc Ly