What is Fat FIRE?
Fat FIRE is financial independence without lifestyle compromise. Rather than trimming expenses to retire as fast as possible, Fat FIRE targets a generous, comfortable budget — think travel, dining, a nicer home, and plenty of discretionary spending — funded entirely by your portfolio.
The upside is a rich retirement with a large safety margin. The trade-off is that the FIRE number is much bigger, so Fat FIRE usually requires a high income, a long accumulation runway, or both. For high earners, though, it can arrive faster than expected.
How the Fat FIRE calculator works
The target is your desired annual spending converted into a portfolio at your safe withdrawal rate:
The calculator then compounds your current assets plus annual savings until you reach that number and reports the age you'll get there. The "Budget Check" confirms whether your spending sits in Fat FIRE territory. The chart plots your net worth climbing to the target.
The inputs
- Current invested assets — your portfolio today.
- Desired annual spending — the generous lifestyle you want to fund.
- Annual savings — how much you invest each year, usually large for Fat FIRE.
- Return rate & safe withdrawal rate — commonly 7% growth and 4% (some Fat FIRE planners use 3.5% for extra safety).
What counts as Fat FIRE?
Fat FIRE is loosely defined as annual spending of $100,000 or more for a household, which at a 4% withdrawal rate means a portfolio of at least $2.5 million — and often $3–5 million or beyond. Spend $200,000 a year and your Fat FIRE number is $5,000,000.
Because these numbers are large, the math rewards income growth far more than penny-pinching. A high earner who holds spending flat and invests the surplus can build a Fat FIRE portfolio through a high savings rate, even without extreme frugality.
Fat FIRE vs the other types
Fat FIRE
Generous budget, largest number, no lifestyle compromise. Usually needs a high income.
Coast FIRE
Stop investing; compounding carries you to your number while you cover expenses.
Coast FIRE calculator →Barista FIRE
Part-time work covers part of expenses; your portfolio covers the rest.
Barista FIRE calculator →Frequently asked questions
What is Fat FIRE?
Fat FIRE is financial independence with a generous, no-compromise budget, typically $100,000 or more of annual spending. It requires a much larger portfolio than regular or Lean FIRE but lets you retire early without cutting your lifestyle.
How much do you need for Fat FIRE?
Your Fat FIRE number is your annual spending divided by your safe withdrawal rate. At a 4% withdrawal rate, $120,000 of spending needs $3,000,000, and $200,000 needs $5,000,000. Fat FIRE targets commonly start around $2.5 million.
What is the difference between Fat FIRE and regular FIRE?
Regular FIRE covers a normal middle-class budget, while Fat FIRE funds a higher, more comfortable lifestyle with travel and discretionary spending. Fat FIRE requires a larger portfolio and usually a higher income or a longer accumulation period.
How do you reach Fat FIRE faster?
Because Fat FIRE numbers are large, growing income is usually the biggest lever. High earners who keep their spending flat and invest the surplus aggressively can reach Fat FIRE surprisingly quickly through a high savings rate.