Coast FI vs Lean FI vs Fat FI: Which Path Is Right for You?

Not everyone wants the same kind of financial freedom. The FI community has settled on three distinct variants — Coast, Lean, and Fat — that suit very different lives and personalities.

Coast FI

You've invested enough that, without adding another dollar, compounding alone will grow your portfolio into a full FI number by traditional retirement age. You still work to cover current expenses, but you can stop saving entirely. Coast FI is the underrated middle path — most people reach it 10–15 years before full FI.

Example: at age 35, you have $200,000 invested. Even if you never add another dollar, at 7% real returns it grows to about $1.5M by age 65. If $1.5M is your FI number, you're already Coast FI.

Lean FI

Full financial independence based on a minimal lifestyle — typically $25,000–$40,000 per year for an individual. Lean FI requires a smaller portfolio (often $625K–$1M) but demands ongoing frugality. It's well-suited to people who genuinely prefer simple living, off-grid lifestyles, or low-cost-of-living areas.

Fat FI

Financial independence with comfortable or even luxurious spending — $100,000+ per year. Fat FI typically requires $2.5M+ and adds years (sometimes a decade) to the journey, but it preserves a lifestyle most professionals would recognize: travel, nice restaurants, kids' activities, home upgrades.

Which fits your life?

• Choose Coast if: you like your work, just want the option to stop saving aggressively, and have time on your side.
• Choose Lean if: you genuinely value simplicity and would rather have time now than comfort later.
• Choose Fat if: your current lifestyle is non-negotiable and you have the income to pursue it.

The FreedomAtlas calculator lets you model all three by adjusting your monthly expense input. Try $3,000/month (Lean), $5,000/month (standard), and $9,000/month (Fat) and watch the years shift.