New, updated Bitcoin retirement calculator. Not like the others. Free to use, computations performed locally by your browser.

I had Astra build BTC Retirement Lab to explore how much BTC you might need to retire, using thousands of simulated futures that account for spending, inflation, and the user's accepted risk of going broke.

The latest version adds mixed portfolios (BTC, stocks, bonds, and cash), Social Security income, rebalancing with fees, whole-portfolio charts, and side-by-side scenario comparisons.

It’s a way to explore assumptions and possibilities, not a guarantee. Would love feedback!