Financial Calculators

Compound Interest

Future value of a lump-sum investment at a given rate, compounding frequency, and date range.

Tax-Equivalent Yield

Pre-tax yield a taxable bond must offer to match a tax-exempt yield at your marginal rates.

Historical Inflation

Translate a dollar amount between any two years using real CPI data going back to 1800.

Inflation Projection

Project how a fixed annual inflation rate erodes purchasing power over time.

Real Return

Compare nominal, after-tax, and inflation-adjusted returns to see the true growth of an investment.

Roth Conversion

Year-by-year conversion plan using 2025 tax tables, with IRMAA cliff detection and Social Security provisional income tracking.

Dollar Weakness Index

US dollar trade-weighted exchange rate vs. gold ETFs, with live FRED data and Pearson correlation.

Inherited IRA Optimizer

Bracket-leveling distribution plan for inherited IRAs — minimizes combined federal + NYS tax over the SECURE Act 10-year window.

Retirement Optimizer

Compare tax-deferred, Roth-first, and balanced contribution strategies across your full accumulation and retirement horizon.