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Lean FIRE vs. Fat FIRE

Compare lean and fat FIRE goals.

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Lean FIRE vs. Fat FIRE

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How This is Calculated

Formula:

Lean FIRE Target = Lean Annual Expenses * 25 | Fat FIRE Target = Fat Annual Expenses * 25

Compares minimalist early retirement target (Lean FIRE) to a high-end or luxurious early retirement target (Fat FIRE).

Sources & Assumptions: Based on Trinity Study historical safe withdrawal rate methodologies.

What Are Lean FIRE and Fat FIRE?

FIRE — Financial Independence, Retire Early — is built on the concept of accumulating a portfolio large enough that your safe annual withdrawal covers your living expenses indefinitely. Within the FIRE community, two distinct flavors exist: Lean FIRE targets a frugal, minimalist retirement lifestyle with annual expenses typically under $40,000. Fat FIRE targets a comfortable or even luxurious retirement with annual expenses of $80,000–$150,000+. Both are calculated using the same mathematical foundation — the 25x rule — which is derived from the 4% Safe Withdrawal Rate established by the landmark 1998 Trinity Study. The only difference is the size of your target annual spending, which determines the portfolio you need to accumulate.

Formula Used

Formula:

Lean FIRE Number = Lean Annual Expenses × 25 | Fat FIRE Number = Fat Annual Expenses × 25
Sources & Assumptions: Based on the Trinity Study (Cooley, Hubbard & Walz, 1998) historical safe withdrawal rate analysis using 50-year rolling stock/bond portfolio simulations.

ⓘ Disclaimer: Results are estimates for educational purposes only and do not constitute financial, tax, or investment advice. Always consult a qualified financial professional before making significant financial decisions.

Results are for informational purposes only and do not constitute financial advice. Always consult a qualified financial professional.