FIRE Number Calculator
Calculate your Financial Independence Retire Early (FIRE) number — the portfolio size needed to retire at any age.
Calculation Inputs
Calculation Results
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Enter inputs on the left and click Calculate to view results.
Formula & Methodology
FIRE Number = Annual Expenses / Safe Withdrawal Rate; Years = FV formula solved for n
The 4% rule states you can withdraw 4% annually from a diversified portfolio indefinitely with high historical success.
Frequently Asked Questions
What is lean FIRE vs fat FIRE?
Lean FIRE targets minimal expenses (e.g., $40k/year). Fat FIRE targets higher spending ($100k+/year). Regular FIRE is in between.