🔥FIRE Calculator

About this tool

Enter your age, traditional retirement age, annual spending in retirement, how much you have invested, how much you invest each year, a real (after-inflation) return and a withdrawal rate. You get the FIRE number, years and age to reach it, progress so far, the Coast FIRE number, Lean and Fat variants and a chart of your path.

The maths behind financial independence

Financial independence means your investments can pay for your life indefinitely. The FIRE number is annual spending divided by a safe withdrawal rate: at 4% that is 25 times spending, so 40,000 a year needs 1,000,000. The 4% rule comes from US research on 30-year retirements (the Trinity study and Bengen's work); for early retirees facing 40–50 years many planners prefer 3–3.5%, which raises the number to 29–33 times spending. Years to FI depend mostly on your savings rate: with 85,000 invested, 24,000 added a year and a 5% real return, 1,000,000 takes about 20 years. Coast FIRE is the amount that would grow to the target by traditional retirement age with no further contributions — about 200,000 for a 32-year-old aiming at 65 in that example — after which you only need to cover current spending. Using a real return keeps everything in today's money. Honest notes: returns are uneven, a crash early in retirement does more damage than the average suggests, and taxes, pensions and healthcare are outside this model. General information, not financial advice. The retirement calculator models a traditional pension, the SIP calculator monthly investing, the net worth calculator tracks progress, and the inflation calculator converts to real terms.

Frequently asked questions