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Quick, no-signup-required calculators for one-off questions.

Coming soon. The first batch: FIRE number, savings rate, coast age, and Social Security claiming.

The retirement planner that models your whole financial life — together with your partner, down to the month.

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Research-backed retirement modeling. Built on Bengen 1994, Trinity 1998, Shiller, and SSA data. Calcifir is not a registered investment advisor; nothing here is personalized financial, tax, or legal advice.