FIRE Movement Math: How to Calculate Your Retirement Number

Retained from the earlier FinanceMath website. This historical guide has not yet completed the rebuild’s editorial review. Tax rates, eligibility rules and dated claims must be checked against current official sources. For tested calculation methods, use the current calculators.

FIRE Movement Math: How to Calculate Your Retirement Number

Determine your financial independence target using the 4% withdrawal rule and annual cost estimates.

The 25x Rule for Early Retirement

To calculate your FIRE target, multiply projected annual living expenses by 25. According to historical market data, a 4% safe withdrawal rate protects your principal base.