Discover the number for financial independence

What Is Financial Independence?

Financial independence (the FI in FIRE — Financially Independent, Retire Early) means having enough invested assets that the returns cover your living expenses indefinitely. Most FI calculations use the 4% rule: your FI number is 25x your annual expenses.

How Fast Can You Reach FI?

Your savings rate is the single biggest variable. At a 10% savings rate, FI takes about 43 years. At 30%, it takes 28 years. At 50%, 17 years. At 70%, just 8.5 years. The maths of FIRE is compelling and replicable.

What People Often Overlook

Many people focus purely on the target number and forget that small lifestyle changes can move the finish line dramatically. Reducing annual expenses by even a modest amount does two things at once — it lowers the FI number itself and frees up more to save each month. That double effect is worth considering when thinking about where your money actually goes. It can help to track spending in detail for a month or two before running any calculations, just to get a realistic baseline.

Is the 4% Rule Still Relevant?

One approach is to treat the 4% rule as a starting point rather than a fixed answer. Some people prefer a more conservative withdrawal rate — around 3% to 3.5% — particularly if they plan for a very long retirement or expect variable returns. Others find that a upper rate feels reasonable given part-time income or flexible spending in later years. The figures in any calculator are illustrations, not predictions, but they give a genuinely useful sense of direction.

Run it with sensible defaults

Using annual living expenses of 40,000, current invested assets of 30,000, annual amount saved of 15,000, expected annual return of 7, the calculation works out to 1,000,000.00. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Annual Living Expenses, Current Invested Assets, Annual Amount Saved, and Expected Annual Return — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

How the math works

This calculator estimates the Financial Independence number by dividing annual expenses by the expected return rate, then projects years to reach that target using compound growth math. It assumes constant annual savings, consistent investment returns, and annual compounding with no fees or withdrawals. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".

Turning the result into a plan

A projection is just a starting point. The real work is setting the monthly amount aside automatically so the saving happens before you can spend it. Most people who hit savings goals set up a standing order on payday; most who miss them rely on willpower at month-end.

What this doesn't capture

The calculation assumes a steady savings rate and a stable interest rate. Real saving journeys include emergencies, windfalls, and rate changes — especially in easy-access products. The figure is a direction of travel, not a guarantee.