About this calculator

FIRE Calculator is a free, fast tool for estimating your path to Financial Independence / Retire Early (FIRE). It runs entirely in your browser — we don't collect or store the numbers you enter.

The methodology

The tool uses standard, public-domain personal-finance math:

All figures are shown in today's dollars (inflation-adjusted) by default.

Data sources

Life-expectancy by country: World Bank Open Data (life expectancy at birth, 2024). The 4% safe withdrawal rate originates from research by William Bengen (1994) and was reinforced by the Trinity Study (Cooley, Hubbard & Walz, 1998) — both public-domain findings widely cited in personal finance. Return/inflation assumptions reflect common long-run averages and are fully editable.

Important

This is an educational tool, not financial advice. Real outcomes depend on market sequence-of-returns, taxes, healthcare and life changes the model simplifies. Consult a qualified professional before making decisions.