FIRE Number Calculator
Your financial independence target. Annual expenses × 25.
$1,200,000
~24 years away at your current rate.
Lean FIRE (15×)
$720,000
FIRE (25×)
$1,200,000
Fat FIRE (33×)
$1,584,000
The 25× rule is from the Trinity Study, which found a 4% safe withdrawal rate sustained a portfolio for 30+ years across most historical periods.
About
FIRE (Financial Independence, Retire Early) targets are based on the 4% rule. A portfolio 25× your annual expenses can sustainably fund retirement. This calculator shows your FIRE number, lean-FIRE (15×), fat-FIRE (33×), and how many years until you hit it at your current savings rate.
How to use
- Enter your annual expenses (the amount you'd want to spend in retirement).
- Enter current invested assets and what you save per year.
- Pick an expected real return.
- See your FIRE number, the years until you reach it, and lean/fat variants.
FAQ
Where does the 25× figure come from?+
The Trinity Study found that a portfolio of 50/50 stocks/bonds had a high probability of lasting 30+ years if you withdrew 4% of the original balance each year, adjusted for inflation. 1 / 0.04 = 25.
Should I use pre-tax or post-tax expenses?+
Use what you actually spend. If you'd pay tax on withdrawals, adjust upward. Most FIRE calculators assume the expense number is what hits your bank account.