// multi-utility computation suite · offline · instant · precise
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pfin.financial-independence-number Calculator
Calculates the FIRE (Financial Independence, Retire Early) number — the portfolio size needed to retire on investment income — using the 4% withdrawal rule and current savings. Knowing your FI number converts retirement from an abstract goal to a measurable milestone.
Inputs
Annual Spend
Reference formula or conversion factor shown for context.
Safe Rate Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Current Portfolio
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Annual Savings
Reference formula or conversion factor shown for context.
Results
FI number
Sample size or count used in the calculation.
current portfolio
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
gap
Reference formula or conversion factor shown for context.