Fat FIRE Calculator
Find your Fat FIRE number: the larger portfolio needed to retire early while maintaining — or upgrading — your current lifestyle, with no cutbacks.
This projection assumes a steady, unchanging return. Curious how your plan holds up against real market volatility? Try the Monte Carlo calculator →
How the Fat FIRE number is calculated
Divide your annual living expenses by your safe withdrawal rate. Fat FIRE plans often use a more conservative rate than the standard 4% — this calculator defaults to 3.5% — since larger portfolios funding an upscale lifestyle typically favor a wider safety margin over a longer retirement horizon. The default return assumes historical U.S. stock market averages; see ourmethodology page for the full explanation and how to customize it.
FAQ
What is Fat FIRE?
Fat FIRE means retiring early without cutting back on your current lifestyle — often defined as retiring on $100,000+ a year in expenses. It requires a much larger portfolio than standard or Lean FIRE, but it means no compromises on spending once you get there.
Why use a lower withdrawal rate for Fat FIRE?
It's not a hard rule, but many people pursuing Fat FIRE use a more conservative withdrawal rate (3-3.5% instead of the standard 4%) as an extra safety margin — larger portfolios often come with longer planning horizons, a desire to preserve capital for heirs, or simply less tolerance for cutting spending in a down market.
Fat FIRE vs Lean FIRE — what's the difference?
Same underlying formula (annual expenses ÷ withdrawal rate), applied to opposite ends of the lifestyle spectrum. Lean FIRE minimizes expenses to reach independence as fast as possible; Fat FIRE preserves — or upgrades — your current lifestyle, which takes a significantly larger portfolio to fund safely.