Choose the calculator by question, not by the biggest number
A retirement savings gap is not an RMD. An employer match is not a market return. A pension cash crossover is not a payout recommendation. A Medicare IRMAA bracket is not a complete plan premium. A FIRE target is not a guaranteed safe withdrawal amount. Keeping these questions separate makes each result easier to understand and harder to misuse.
Carry verified values forward: actual balances from dated statements, a contribution the budget can support, plan rules from current documents, and spending expressed in consistent dollars. When a calculator asks for a return, inflation rate, tax rate, or withdrawal rate, rerun it with less favorable assumptions rather than optimizing a single answer.
These tools provide general educational arithmetic, not investment, retirement, tax, legal, benefits, or financial advice. Laws, account rules, plan documents, taxes, market outcomes, inflation, fees, income, spending, health, and longevity vary. Verify current official requirements and consider qualified professional guidance before acting.