Financial Independence Calculator FIRE Calculator: find your number and the age work becomes optional
Enter what you earn, spend and have invested. This FIRE calculator works out your FIRE number, how many years until financial independence, and when you reach Lean, Coast, Barista and Fat FIRE, all in today’s money.
Method based on the 4% safe withdrawal research of the Trinity Study (AAII), compound growth as used by the SEC’s Investor.gov, and inflation data from the U.S. Bureau of Labor Statistics.
Your numbers
Results update as you type. Use after-tax figures and today’s prices.
Income and spending
Savings and investing
Retirement assumptions
You could reach financial independence at
49.6years old
Calculating your timeline.
Your path to financial independence
Projected portfolio in today’s money against your FIRE number.
Every type of FIRE, for your numbers
Same savings and returns, different finish lines.
| FIRE type | Target | Years away | Your age |
|---|
What would get you there sooner
Each change tested on its own against your current plan.
How your withdrawal rate changes the target
A lower rate is safer for a long early retirement but takes longer to reach.
| Withdrawal rate | FIRE number | Years away | Your age |
|---|
Savings rate vs. years to financial independence
Based on your income and current savings, assuming you spend whatever you don’t invest.
| Savings rate | Invested per year | FIRE number | Years away |
|---|
Milestones and insights
Checkpoints worth celebrating on the way.
What is a FIRE number?
Your FIRE number is the amount you need invested so that withdrawals can cover your living costs indefinitely. The standard formula is annual spending divided by a safe withdrawal rate. At the common 4% rule, that equals 25 times your yearly spending, so someone spending $48,000 a year needs about $1.2 million.
FIRE stands for Financial Independence, Retire Early. The goal is not necessarily to quit work at 40. It is to reach the point where working becomes a choice rather than a requirement. This financial independence calculator answers the two questions everyone in the FIRE movement asks first: how much do I need to retire early, and how long will it take me to get there?
I built this tool after testing most of the popular early retirement calculators and finding the same gaps. Many ignore inflation, show a single number with no context, or treat Coast FIRE and Barista FIRE as separate tools. Here, one set of inputs gives you every version of the answer, projected in today’s money so the figures stay meaningful 20 years from now.
How to use this FIRE calculator
- Enter your age and take-home income. Use pay after tax and after any retirement plan deductions you already count as savings.
- Add your yearly spending. Your bank and card statements for the last 12 months give the most honest figure. Budgets tend to run low.
- Set your spending in financial independence. Raise it if you will pay for your own health insurance or expect taxes on withdrawals. Lower it if your mortgage will be paid off.
- Enter what you have invested and what you add each year. Count brokerage accounts, 401(k)s, IRAs, pensions you can access, and similar long-term investments. Leave out your home and emergency fund.
- Check the return, inflation and withdrawal assumptions. The defaults (7% return, 3% inflation, 4% withdrawal) are reasonable starting points for a stock-heavy portfolio. Test more cautious numbers too.
The FIRE calculator formula
Three formulas power every result above. Writing them out lets you check the math yourself, which is exactly what you should do before making a decision this large.
FIRE number = annual spending ÷ withdrawal rate
Real return = (1 + return) ÷ (1 + inflation) − 1
Coast FIRE number = FIRE number ÷ (1 + real return)years to standard retirement
To find your years to financial independence, the calculator grows your current portfolio month by month at the real (inflation-adjusted) return and adds your contributions each month. The first month your balance reaches the FIRE number is your financial independence date. Because everything is in today’s money, your contributions are assumed to rise with inflation, which matches how most people’s pay behaves over time.
Lean, Fat, Coast and Barista FIRE explained
The FIRE community uses several labels for different finish lines. The calculator sets them as follows so you can compare them side by side.
| FIRE type | What it means | How this calculator sets it | Best suited to |
|---|---|---|---|
| Lean FIRE | Full independence on a frugal budget | 75% of your planned spending ÷ withdrawal rate | Minimalists and low-cost-of-living areas |
| Regular FIRE | Full independence at your normal lifestyle | 100% of your planned spending ÷ withdrawal rate | Most people planning to stop working |
| Fat FIRE | Independence with a generous budget and buffer | 150% of your planned spending ÷ withdrawal rate | High earners who want travel and margin for error |
| Coast FIRE | Enough invested that growth alone reaches your FIRE number by standard retirement age | FIRE number discounted back at your real return | People who want to stop saving and take lower-paid, more meaningful work |
| Barista FIRE | Investments cover part of your costs, part-time work covers the rest | (Spending − part-time income) ÷ withdrawal rate | Anyone who wants out of full-time work sooner |
Coast FIRE is the milestone most people miss. Once you hit it, your future self is funded even if you never invest another dollar, as long as you can cover today’s bills. For many readers that changes how they feel about work long before full financial independence arrives.
Why your savings rate matters more than your income
Your savings rate does two jobs at once. It increases what you invest each year, and it lowers the spending your portfolio must eventually support. That double effect is why the years to FIRE fall so quickly as your savings rate rises. The table below assumes you start from zero, earn a 5% real return, and use a 4% withdrawal rate.
| Savings rate | Years to financial independence | Savings rate | Years to financial independence |
|---|---|---|---|
| 10% | 51.0 years | 45% | 18.8 years |
| 15% | 42.5 years | 50% | 16.4 years |
| 20% | 36.4 years | 55% | 14.3 years |
| 25% | 31.6 years | 60% | 12.3 years |
| 30% | 27.7 years | 65% | 10.4 years |
| 35% | 24.3 years | 70% | 8.7 years |
| 40% | 21.4 years | 75% | 7.1 years |
Notice that moving from a 10% to a 20% savings rate cuts almost 15 years off the timeline. Income still helps, because it is easier to save 50% of a large paycheck, but the timeline itself depends on the ratio, not the size of the salary.
Is the 4% rule still safe for early retirement?
The 4% rule comes from research by financial planner William Bengen in 1994 and the 1998 Trinity Study, which tested historical U.S. stock and bond returns. They found that a balanced portfolio withdrawing 4% in the first year, then adjusting for inflation, survived almost every 30-year period on record.
Early retirees face a longer horizon. If you stop working at 40, your money may need to last 50 years or more. For that reason, many careful planners use 3.25% to 3.5% for very early retirement, which means saving roughly 29 to 31 times annual spending instead of 25. Use the withdrawal rate table in the calculator to see exactly how much extra time that margin of safety costs you.
Flexibility is the other safeguard. Cutting spending for a year or two after a market crash, or earning a little part-time income, does more to protect an early retirement than any single withdrawal number.
A worked FIRE calculation example
Take the default inputs: a 30-year-old earning $85,000 after tax, spending $48,000, with $60,000 invested and $37,000 added each year. That is a 43.5% savings rate. At a 7% return and 3% inflation, the real return is about 3.88%.
- FIRE number: $48,000 ÷ 0.04 = $1,200,000
- Coast FIRE number today: about $316,000, reached around age 38
- Barista FIRE with $20,000 of part-time income: $700,000, reached around age 43
- Full financial independence: about age 49.6, in 19 years and 7 months
The same person who trims spending by 10% reaches financial independence nearly three years sooner, because the target falls and the yearly investment rises at the same time. That pattern holds for almost everyone, and the levers panel above shows it for your own numbers.
Common mistakes when calculating your FIRE number
Using a budget instead of real spending
Annual costs like car repairs, gifts, travel and home maintenance rarely show up in a monthly budget. Pull a full year of actual spending before you trust your FIRE number.
Forgetting healthcare and taxes
In the U.S., health insurance before Medicare at 65 can be one of the largest costs in early retirement. Withdrawals from traditional retirement accounts are also taxable. Build both into your retirement spending figure.
Mixing nominal and real returns
A 10% return with no inflation adjustment can make a 25-year plan look like 15. This calculator always works in today’s money, so the FIRE number you see is the buying power you will actually have.
Ignoring sequence-of-returns risk
A market drop in the first few years of retirement hurts far more than the same drop later. A cash buffer of one to two years of spending, a lower withdrawal rate, or flexible spending all reduce this risk.
Related finance calculators
Financial independence planning touches several other questions. These tools answer the ones I am asked about most often alongside the FIRE number.
FIRE calculator FAQs
Divide the amount you plan to spend each year by your safe withdrawal rate. At 4%, multiply your annual spending by 25. For example, $60,000 a year in spending gives a FIRE number of $1.5 million.
Most people need 25 to 33 times their annual spending invested. Use 25 times with the 4% rule, or closer to 30 times if you retire before 45 and want a more conservative 3.25% to 3.5% withdrawal rate.
It depends mainly on your savings rate and what you have already invested. Starting from zero with a 5% real return, a 50% savings rate takes about 16 years and a 25% savings rate takes about 32 years. Enter your numbers above for an exact estimate.
A Coast FIRE calculator finds how much you need invested today so that growth alone reaches your FIRE number by a standard retirement age, such as 65. This calculator shows your Coast FIRE number and the age you reach it.
Lean FIRE means financial independence on a frugal budget, often under $40,000 a year. Fat FIRE means independence with a generous budget, often $100,000 or more a year. This calculator sets Lean at 75% and Fat at 150% of your planned spending.
With Barista FIRE, your investments cover part of your spending and part-time work covers the rest. If you spend $48,000 and earn $20,000 part time, your portfolio only needs to fund $28,000, which at 4% is $700,000 rather than $1.2 million.
For a diversified, stock-heavy portfolio, 6% to 8% nominal with 2.5% to 3% inflation is a common planning range, giving a real return of roughly 3% to 5%. Test a cautious case as well, since the future rarely matches long-run averages.
The 4% rule was tested on 30-year periods. For retirements of 40 to 50 years, many planners prefer 3.25% to 3.5%, or a 4% start combined with flexible spending in bad market years.
Usually not. Your FIRE number should count only assets that can produce income or be sold to fund spending. A paid-off home helps by lowering your spending, which lowers the FIRE number itself.
Use take-home pay after tax, and count retirement plan contributions as part of what you invest. That keeps your savings rate accurate and avoids double-counting.
Projecting in today’s money removes inflation from the picture so a $1.2 million target means $1.2 million of today’s buying power. It makes the FIRE number easier to compare with your current spending.
No. It is an educational planning tool based on fixed assumptions. Real markets vary year to year, so speak with a licensed financial adviser before making decisions about retiring or changing your investments.
Manzoor Ahmad
Manzoor builds and tests every calculator on DexoCalc by checking its formulas against published research and hand-worked examples. This FIRE calculator was verified against the Trinity Study withdrawal framework and standard compound growth formulas. Read more about Manzoor.
Sources and methodology
- Cooley, Hubbard and Walz, “Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable” (Trinity Study), AAII Journal.
- U.S. Securities and Exchange Commission, Investor.gov compound interest calculator.
- U.S. Bureau of Labor Statistics, Consumer Price Index.
This financial independence calculator gives estimates for education and planning only. It assumes a constant return, constant inflation and contributions made monthly, which real markets will not match. It is not investment, tax or legal advice.