Financial Independence, Retire Early. Enter your savings, what you add each year, and what you spend, and find out the age your investments could cover your life for good.
FIRE Financial Independence, Retire Early is the point where your investments can cover your living costs without a paycheck. You're not required to stop working, but you're free to. The whole game is reaching your FIRE number: the size of portfolio that, at a safe withdrawal rate, throws off enough to live on indefinitely.
For early retirement, how much you save matters more than how much you earn. A high savings rate does two things at once: it grows your investments faster and it lowers the spending you need to replace. Save 50% of your take-home pay and financial independence is roughly 17 years away; push to 65% and it's closer to a decade. This is why the FIRE community obsesses over the savings rate above all else.
The classic 4% rule was built on 30-year retirements. Retire at 45 and you might need your money to last 50 years, which leads many early retirees to use a more conservative 3.25% to 3.5% rate. A lower rate raises your FIRE number but cuts the risk of running out, a tradeoff worth modeling rather than guessing.