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Transparent by Default

Methodology

Every calculator's math is open: the exact source code, the authoritative reference it follows, and the reference values we test against on every build.

Compound Interest →

Period-by-period growth with contributions, withdrawals, and annuity timing.

APY ↔ APR →

Converting nominal rates to effective annual yield (Regulation DD).

FIRE & Coast FIRE →

The 4% rule and discounting a target back to today.