Portfolio Longevity Calculator

Estimate how long a portfolio lasts with constant return and inflation assumptions.

Starting portfolio ($)

Current monthly expenses ($)

Expected annual market return (%)

Expected annual inflation (%)

Projection period (years)

Withdrawal timing

Assumptions: return and inflation are constant every year and converted to monthly rates. This is a deterministic estimate, not a forecast. Real markets are volatile and sequence-of-returns risk can materially change outcomes.