Roth Conversion Ladder Calculator

Optimal yearly conversion to fill your bracket, lifetime tax saved and RMD reduction.

Annuity Calculator

Solve FV, PV, payment or payment-to-target — standard actuarial math.

HSA Calculator

Lifetime HSA tax advantage vs 401(k)-only and taxable brokerage paths.

Powerball Annuity Calculator

Lump-sum cash vs 30-year annuity net of federal and state lottery tax.

401(k) Early Withdrawal Calculator

10% penalty + tax + opportunity cost, with SECURE Act 2.0 exception flags.

Medicare Part D vs Advantage Compare

All-in annual cost: Original + Part D vs Advantage with network score.

Pension Lump-Sum vs Monthly Decision Calculator

NPV both paths, breakeven age and longevity sensitivity at LE 75/85/95.

Kg to Lbs Converter

Convert kilograms to pounds with the exact 2.20462 factor and formula.

Lbs to Kg Converter

Convert pounds to kilograms with the exact factor and formula.

Grams to Ounces Converter

Convert grams to ounces with the exact factor and common-values table.

Cm to Inches Converter

Convert centimeters to inches with the exact factor and formula.

Inches to Cm Converter

Convert inches to centimeters with the exact factor and formula.