How the FIRE number works
FIRE stands for financial independence, retire early. The idea: once your investments are large enough, you can live off a small yearly withdrawal without running out. With the common 4 % rule, that means about 25 times your yearly expenses.
The calculator divides your yearly expenses by the withdrawal rate to get your target, then adds your yearly savings and a real return (after inflation) year by year until you reach it.
What moves the date most
- Your expenses: every 1,000 less a year lowers the target by 25,000 at 4 %.
- Your savings rate: saving half your income gets you there far sooner than saving a tenth.
- Time: the earlier money is invested, the more of the work the returns do.