How These Calculators Work

Methodology: formulas use compound growth, savings accumulation, and withdrawal-rate arithmetic.

Inputs: current assets, annual/monthly contributions, return assumptions, spending targets, and time horizon.

Datasets: savings-rate ranges, withdrawal-rate sets, and return-assumption presets.

Limitations: no model can fully capture sequence risk, tax policy changes, or life events.

Intended use: educational planning and sensitivity testing, not guaranteed retirement forecasting.

For background context, see the About page.