Financial Independence Calculator
Financial independence is a number and a date: the portfolio that covers your life from returns alone, and when you'll have it. Enter income, spending and savings — see how far you are, and which lever moves the date most.
▸ What a different savings rate would do
| Savings rate | Invested | FI number | Years to FI |
|---|
Estimates are for illustration and education only — not financial advice. Use a real (after-inflation) return so all figures stay in today's dollars.
The math of financial independence
You're financially independent when your portfolio can pay for your life indefinitely: FI number = annual spending ÷ withdrawal rate — at the classic 4%, that's 25× annual spending. Spend $4,200/month and you need about $1.26M. Note what's not in the formula: your income. Income only matters through what it lets you save.
Savings rate is the whole game
Your savings rate attacks the problem from both ends — every extra dollar saved grows your portfolio and shrinks the lifestyle the portfolio must fund. That's why the jump from a 10% to a 30% savings rate cuts decades off the date, while a raise spent entirely on lifestyle cuts nothing. The savings-rate table above makes this brutally concrete.
FI is a spectrum, not a cliff
Along the way you pass real milestones: Coast FIRE (retirement is funded by compounding alone — our Coast FIRE calculator finds it), Barista FI (part-time work closes the gap), and full FI. Many people find the middle milestones change their choices years before the final number arrives.
Keep the numbers honest
Use a real (after-inflation) return — 4–6% is a common long-run assumption for stock-heavy portfolios — so your spending, FI number and date all stay in today's dollars. And test a 3.5% withdrawal rate if you expect a very long retirement; the retirement calculator models the drawdown side in detail.
Savings rate → years to FI
Starting from zero, at a 5% real return and 4% withdrawal rate. The famous "shockingly simple" math — income level doesn't appear.
| Savings rate | Years to FI | Work-life meaning |
|---|---|---|
| 10% | ~51 years | Traditional career, retire at ~70 |
| 25% | ~32 years | Comfortable head start |
| 50% | ~17 years | FI in one working generation |
| 65% | ~10.5 years | A single focused decade |
| 75% | ~7 years | Extreme frugality territory |
Rounded; assumes constant real return, constant spending, starting from $0 — illustrative only.
The FIRE math behind the movement
Financial independence has a startlingly simple core: your savings rate, not your income, sets your timeline. What you don't spend does double duty — it grows your nest egg and lowers the target.