Savings
Financial Independence Calculator
Financial independence is the point where your portfolio — not your paycheck — can cover your spending. This calculator projects that point from four honest inputs: what you have, what you save monthly, what your life costs, and how much your investments can safely withdraw. The answer is a date, and the savings rate that moves it.
Results
FI number: $1,000,000.00, Time to financial independence: 31 years, Implied savings rate: 23.1%, Portfolio at arrival: $1,004,525.49
- FI number
- $1,000,000.00
- Annual spending ÷ withdrawal rate (25× at 4%)
- Time to financial independence
- 31 years
- At the entered savings and return
- Implied savings rate
- 23.1%
- Savings ÷ (savings + spending) — the lever that moves this date
- Portfolio at arrival
- $1,004,525.49
- 60% of it is investment growth
The plan at a glance
| Step | Amount |
|---|---|
| FI number (target portfolio) | $1,000,000.00 |
| Starting savings | $25,000.00 |
| Save monthly for 31 years | $1,000.00 |
| Total contributed by then | $397,000.00 |
| Investment growth does the rest | $607,525.49 |
| Portfolio when FI is reached | $1,004,525.49 |
- Contributions are assumed to arrive at the end of each month and the entered return compounds monthly.
- Enter an inflation-adjusted (real) return so the whole projection stays in today’s dollars.
- The withdrawal-rate rule comes from historical portfolio studies and does not guarantee any future outcome — see our financial disclaimer.
- This is an educational estimate, not investment advice.
How to use this calculator
- Enter your current invested savings — retirement accounts included.
- Enter the amount you invest in a typical month.
- Enter the annual spending the portfolio must eventually cover. A good first pass is your current yearly spending minus what work costs you.
- Set the withdrawal rate: 4% is the classic rule; use 3–3.5% if you expect a long retirement or want more margin.
- Enter an expected annual return in inflation-adjusted terms — around 5% is a common long-run diversified estimate — and read your FI date, target portfolio, and the savings rate driving it.
How the calculation works
FI number = annual spending ÷ withdrawal rate balance(m) = balance(m−1) × (1 + r/12) + monthly savings FI month = first month where balance ≥ FI number implied savings rate = monthly savings × 12 ÷ (monthly savings × 12 + annual spending)
The FI number inverts the withdrawal rate: at 4%, spending of $40,000 needs a portfolio of $1,000,000 (25× spending). The projection then simulates the portfolio month by month — end-of-month contributions compounding at the entered rate — until it first crosses the FI number.
Worked example
Input
Starting savings: $25,000. Saving: $1,000 per month. Spending to cover: $40,000 a year. Withdrawal rate: 4%. Expected return: 5% inflation-adjusted.
Result
FI number: $40,000 ÷ 0.04 = $1,000,000. Time to FI: 372 months — 31 years. Implied savings rate: 23.1%. The portfolio arrives at $1,004,525.49, of which $397,000.00 is what you contributed and $607,525.49 is investment growth.
Assumptions and important notes
- Contributions arrive at the end of each month and the entered return compounds monthly.
- The projection runs in today’s dollars: enter an inflation-adjusted (real) return so spending and balances stay comparable.
- Rates are held constant for the whole projection; real markets swing year to year.
- No taxes, fees, or portfolio changes are modeled.
- The withdrawal-rate guideline comes from historical US portfolio studies (the “4% rule”) and describes a planning rule, not a guaranteed outcome.
- The simulation caps at 100 years; plans that cannot cross the FI number within it are reported as unreachable.
Frequently asked questions
Why is the FI number 25× my spending?
It is the arithmetic of the 4% rule: 1 ÷ 0.04 = 25. Historical studies of US portfolios found that a first-year withdrawal of about 4%, adjusted for inflation each year, survived most 30-year retirements. Longer retirements — early ones included — are often planned at 3–3.5%, which raises the multiple to 29–33×.
What return should I enter?
An inflation-adjusted return, because the calculator keeps everything in today’s dollars. Long-run real returns for diversified stock-heavy portfolios have historically landed near 5–7%, but future returns are unknown and not guaranteed. Running the projection at a conservative rate tells you more than an optimistic one.
Does reaching the number mean I can quit my job that day?
It means the math plausibly works at your withdrawal rate — a rule of thumb, not a promise. Real retirements face sequence risk: poor early returns hurt more than poor late ones. Most people build a margin (a lower withdrawal rate, flexible spending, or a buffer year or two of cash) before pulling the trigger.
Which lever moves the date the most?
The savings rate, because it works both ends: more saving grows the portfolio faster while shrinking the spending it must cover. Cutting the spending your portfolio must fund lowers the FI number directly — a 10% spending cut can pull the date in by several years at moderate rates. Test both levers and watch the date respond.
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