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Lean, Coast, Flamingo, Fat FIRE: pick your flavor in 5 minutes

4 FIRE flavors, 4 temperaments, target capital from $280k to $2.5M. Formulas, worked examples, and a personal quiz to find yours.

Beginner

7 min

Foundations

The 4 FIRE flavors: which one buys you 10 extra years?

Coast at 30 takes one-fifth the capital that Fat at 50 needs. But it also means 35 years of waiting on compound interest. We compare the 4 strategies with the exact numbers you need to decide.

🌱 Lean FIRE: free at 40 with $625k (if you live on $25k/year)

Lean FIRE means reaching independence with a deliberately frugal lifestyle, typically $20,000 to $30,000 in annual spending, which means a target capital of $500,000 to $750,000. It's the go-to flavor for committed optimizers: minimalists, digital nomads, and expats in low-cost-of-living countries. Upside: you reach FIRE 5 to 10 years sooner than with a standard budget. Downside: little margin for the unexpected (health, kids, sustained inflation), and a less flexible lifestyle.

✈️ Coast FIRE: invest $280k before 30, let compound interest do the rest

Coast FIRE means investing aggressively early (between 25 and 35) until compound growth alone, without further contributions, carries you to classic FIRE at age 65. Once you cross that threshold, you can “coast”: switch to a less stressful or lower-paying job, go part-time, or launch an entrepreneurial project. The formula: Coast Number = Fat Number ÷ (1 + r)^(years before 65). Example: at 30 with a $1M Fat Number and 5% real return, the Coast Number is roughly $280k. Once invested, that capital grows to about $1M by 65 on compound interest alone.

🦩 Flamingo FIRE: half the capital, a 5-year sabbatical, and the rest compounds on its own

Flamingo FIRE is the modern semi-FIRE: you reach half your Lean Number (roughly $300k to $350k), then take a 3- to 5-year sabbatical living off a cash buffer (about 5 years of Lean spending set aside in cash). Meanwhile, your main capital keeps compounding untouched. Advantage: maximum flexibility (sabbatical, side project, parenthood) without waiting for full FIRE. Drawback: it demands disciplined cash management and a partial return to work if growth falls short. More flexible than Coast, more cautious than Barista.

👑 Fat FIRE: $2.5M to give up nothing (and 20 more years on the clock)

Fat FIRE means reaching independence with a comfortable, even luxurious budget: typically $80,000 to $150,000 in annual spending, requiring $2M to $4M in capital. It's the favorite flavor of well-paid tech professionals, post-exit entrepreneurs, and dual-income high earners. Advantage: a large safety margin for health, kids' education, travel, and the unexpected. Drawback: it takes 10 to 20 more years than Lean or Coast to reach, and demands a high salary or a very high savings rate (above 50%).

🧭 Which flavor fits your profile? Answer 3 questions

Ask yourself three questions.

What is the minimum viable spending level for your family? Under $30k/year and geographically flexible → Lean. $80k to $150k/year non-negotiable → Fat.
Did you start investing early (before 35)? If so, and you want to ease off the gas → Coast.
Do you want a pause option (sabbatical, project) without waiting until 60? → Flamingo.
Many FIRE folks combine flavors across life stages: Lean at 25 to break free fast, Coast at 35 to slow down, Flamingo at 45 for a sabbatical, Fat at 55 for the transition to retirement.

💡 Peter, 32, $4,000/month: his 4 possible trajectories

Peter saves 40% of his income ($1,600/month). His comfortable annual spending: $28,800 (Fat baseline for him). His Fat FIRE target = 28,800 × 25 = $720,000. His Lean target (60% of comfort = $17,280/year) = $432,000. His Coast target at 65 = 720,000 / (1.05)^33 ≈ $145,000. His Flamingo target = 432,000 × 0.5 + 5 × 17,280 = $302,400. At $1,600/month invested at 5% real:

✈️ Coast in ~6 years → age 38
🦩 Flamingo in ~12 years → age 44
🌱 Lean in ~16 years → age 48
👑 Fat in ~21 years → age
🏁 Four possible trajectories depending on the lifestyle he chooses.

⚠️ 3 mistakes that wreck your flavor choice

Choosing Lean to go fast, then discovering you don't enjoy frugality: the novelty wears off and kills the plan. Test 6 months in Lean before committing for 30 years.
Underestimating Coast: waiting until 65 demands patience and exposes you to 30 years of inflation and adverse return sequences.
Confusing Fat with luxury: if your Fat budget doubles every 5 years, you're chasing a moving target. Define, once and for all, what “comfortable” means for your family.

Key Takeaways

1Four FIRE flavors for four temperaments: Lean (~$625k), Coast (~$280k at 30), Flamingo (50% of Lean plus a cash buffer), Fat (~$2.5M).
2The Expenses × 25 rule stays universal: only the target spending level radically changes the capital you need.
3Coast FIRE = Fat Number ÷ (1 + r)^(years before 65). At 30 with a 5% real return, roughly 28% of the Fat Number is enough.
4The flavor isn't set in stone: aim for Coast first (5 to 10 years), then reassess at each life stage.

🎯 Your next 3 steps (15 minutes, tops)

Step 1: calculate your 4 targets in our simulator (enter your comfortable spending, your age, and your expected real return). Step 2: project your trajectory at your current savings rate to see which one you hit first. Step 3: pick the flavor that maximizes life satisfaction, not just speed. Many FIRE experts recommend aiming for Coast first (a motivating intermediate goal in 5 to 10 years), then reassessing at each life stage. The flavor isn't set in stone: it adapts to your kids, your health, and your career opportunities.