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Lean FIRE Calculator

Minimum FIRE number for frugal early retirement

Lean FIRE Calculator

Annual Expenses ($)

Lean FIRE is a form of financial independence achieved on a very frugal budget, typically below $40,000/year. It requires a smaller portfolio but demands strict spending discipline.

  1. 1FIRE Number = Annual Expenses × 25 (4% safe withdrawal rate)
  2. 2Lean FIRE targets expenses 20–40% below average
  3. 3Typical Lean FIRE budget: $25,000–$40,000/year
  4. 4Geographic arbitrage (lower cost of living) is common
$25,000/year lean expenses=FIRE number $625,000
$30,000/year=FIRE number $750,000
$20,000/year (very lean)=FIRE number $500,000
Annual ExpensesFIRE Number (25×)Monthly Budget
$20,000$500,000$1,667
$25,000$625,000$2,083
$30,000$750,000$2,500
$35,000$875,000$2,917
$40,000$1,000,000$3,333
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