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Financial Independence Number

Free Financial Independence Number calculator with clear step-by-step results.

About Financial Independence Number

The FI number is the portfolio size whose withdrawals cover your spending.

Formula

Formula

FI number = annual spend ÷ safe withdrawal rate

Worked example

With the default values below, Financial Independence Number returns FI Number (Required Portfolio) of $1,000,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual spendingminimum 0 $
40,000 $
Safe withdrawal rateaccepts 1–10
4

Results

FI Number (Required Portfolio)
$1,000,000.00
Monthly Income Produced
$3,333.33
Withdrawal Rate Used
4.00%

Step by step

  1. 1Values used
  2. 2Formula
  3. 3FI Number (Required Portfolio)= $1,000,000
  4. 4Monthly Income Produced= $3,333.33
  5. 5Withdrawal Rate Used= 4.00

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How does this calculator work?

The FI number is the portfolio size whose withdrawals cover your spending.

Why does this matter?

The classic 4% rule is a planning guide, not a guarantee.

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