FIRECalc
Tests retirement plans against every historical market start since 1871.
FIRECalc is a web-based retirement calculator focused on portfolio survival rather than average expected returns. It runs a retirement plan through historical U.S. market periods from 1871 onward, showing how often the plan would have avoided depletion under past conditions.
Why it stands out
- Uses rolling historical start years instead of relying on a single average return assumption.
- Includes long-run U.S. market data covering crashes, inflation shocks, and other difficult periods.
- Can search for savings or spending levels that meet a chosen retirement goal, not just score one fixed plan.
- Keeps the basic version simple while allowing detailed adjustments through optional tabs.
Good to know
- Results depend on the assumption that past U.S. market history is a useful stress test for the future.
- It does not predict future returns and should not be treated as a guarantee of retirement safety.
- Default assumptions are simplified, including no pension or Social Security and a preset stock/bond portfolio unless the user changes them.
- The interface is functional but older and tab-driven, so complex scenarios may require careful review of each section.
Under the radar: Enter optional details across the top tabs before submitting; the site preserves your inputs as you move between tabs, so you can build the full scenario first and run it once at the end.
Photos

Early-retirement planners can test whether a savings balance and annual spending target would have survived severe historical markets. Compare different retirement lengths, withdrawal levels, and portfolio balances before leaving work. Add Social Security, pensions, future savings, or one-time portfolio changes to model a less simplified plan. Experiment with asset allocations and spending approaches to see how they affect historical success rates.
Historical retirement backtesting across every available starting year since 1871; quick inputs for spending, portfolio size, and plan duration; optional tabs for pensions, Social Security, pre-retirement savings, spending models, portfolio mix, lump-sum changes, and scenario investigation; data noted as updated through 1/1/2026.
Alternative listings
Stress-test retirement spending against long-run market history.
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Similar sites elsewhere
- cFIREsim — cfiresim.com
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