Fat FIRE Calculator
Project your Fat FIRE number — the premium tier of financial independence where annual spending runs $100k+ with travel, healthcare, and lifestyle margin built in.
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A Fat FIRE calculator projects the portfolio target needed to retire early on a premium spending plan — typically $100,000 to $250,000 in annual expenses, factoring in healthcare, travel, and lifestyle margin not contemplated in Lean or Regular FIRE plans.
Lean vs Regular vs Fat FIRE
FIRE community shorthand: Lean FIRE targets $25-40k annual spend (~$1M portfolio). Regular FIRE hits $60-80k ($1.5-2M). Fat FIRE begins at $100k spend, often reaching $200-250k ($5-6M+). The trade-off: Fat FIRE provides margin for medical inflation, long-term care, and longer life expectancy, but requires 7-15+ more years of accumulation versus Lean.
Safe Withdrawal Rate for 50+ Year Horizons
The Trinity Study popularized the 4% rule for 30-year retirements. For Fat FIRE retirees with potential 50-60 year horizons, financial planners typically recommend 3.0-3.5% SWR to survive sequence-of-returns risk in long horizons. ERN's Big ERN withdrawal-rate research extends Trinity to longer horizons and supports the lower SWR for early retirees (source: earlyretirementnow.com).
Healthcare and Tax Drag in Fat FIRE
Pre-Medicare healthcare is the single largest line item in Fat FIRE planning. ACA marketplace plans with subsidies can be very cheap at lower MAGI; conversely, Fat FIRE income often exceeds the 400% FPL cliff, requiring direct payment of $20,000-$30,000/year per couple. Roth conversion ladders during low-income early-retirement years help bridge to age 65 Medicare. Asset location (tax-advantaged vs taxable) also reduces drag.
Last updated May 2026. Sources: earlyretirementnow.com, Trinity Study.