WealthBuilder: FIRE Calculator

Find the day you can retire — and the paycheck you'll pay yourself when you get there. One price, forever. No subscription, no ads, no bank linking. Your numbers stay yours. Monte Carlo plus real S&P history (1928–2025), Roth conversion planning, Solo 401(k) math, and four drawdown strategies — in one plan. WHAT'S INSIDE • Net worth dashboard — assets, debts, and your complete financial picture • Your FI number — how much you actually need for work to become optional • Retirement paycheck — compare four drawdown orders side by side: taxable-first, deferred-first, pro-rata, and bracket-fill • Roth conversion planner — model bracket-fill conversions before year-end • Solo 401(k) engine — sole-prop vs S-corp contribution math plus a contribution ledger, using 2026 IRS limits (Rev. Proc. 2025-32) • Monte Carlo simulation + historical backtest against real S&P returns, 1928–2025 • What-if…