FIRE Calculator: Your Wealth Accelerator Dashboard
Enter your income, expenses, and nest egg to find the exact age you reach Financial Independence, your personal FIRE number, and a year-by-year projection of how your money grows.
Your Financial Snapshot
Every field updates your results instantly. No "Calculate" button needed.
yrs
$
$
$
Annual Savings Amount
$0
Net income minus living expenses
Savings Rate
0%
Share of income you invest each year
Long-run average growth of your invested portfolio before inflation. A diversified stock index fund has historically averaged around 7% per year over long periods.
7.0%
%
The average annual rise in the cost of living. We use this to convert your investment return into a "real" rate of return, so projections stay in today's dollars.
2.5%
%
The share of your nest egg you plan to withdraw in your first year of retirement. 4% is the traditional default (a 25x expenses target); lower rates mean a bigger nest egg but more safety margin.
4.0%
%
Your FIRE Results
Your Age of Financial Independence
--years old
Enter your numbers above to see your projected FIRE age.
Target FIRE Number
$0
Years Left to Save
0
Annual Savings
$0
Savings Rate
0%
Age
Year
Annual Savings Added
Nest Egg (Today's $)
Progress to FIRE Number
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Key Terms Explained
The vocabulary of the FIRE movement, in plain English.
FIRE Movement
Short for Financial Independence, Retire Early. A philosophy of saving aggressively and investing the difference so your money can eventually cover your living costs without a job.
Nest Egg
The total amount of invested savings you have built up. This calculator tracks how your nest egg grows from your current net worth toward your FIRE number.
Safe Withdrawal Rate (SWR)
The percentage of your nest egg you withdraw in the first year of retirement, with later withdrawals typically adjusted for inflation. It is designed to make your money last for decades.
The 4% Rule
A widely used guideline stating that withdrawing 4% of your portfolio in year one, then adjusting for inflation each year after, has historically lasted at least 30 years in most market conditions. It implies a nest egg of 25 times your annual expenses.
Savings Rate
The percentage of your after-tax income that you save and invest rather than spend. It is one of the biggest drivers of how quickly you reach financial independence.
Inflation-Adjusted (Real) Return
Your investment return minus inflation. This is the rate your purchasing power actually grows by, and it is the rate this calculator uses to keep projections in today's dollars.
Coast FIRE
A milestone where your existing investments are on track to grow into a full retirement nest egg by a normal retirement age through compounding alone, even if you stop adding new savings.
Lean FIRE
Reaching financial independence on a minimal, bare-bones budget, commonly defined as annual expenses below roughly $40,000. It requires a smaller nest egg and is often reached faster.
Fat FIRE
Reaching financial independence while maintaining a comfortable or upscale lifestyle, often with annual expenses above $100,000. It requires a much larger nest egg and usually takes longer.
Compounding
The process of earning returns on your past returns as well as your original contributions. Over many years it turns steady, modest savings into exponential growth.
The Complete Guide to Reaching Financial Independence
Most people think of retirement as a fixed age, somewhere in their mid-60s, dictated by a calendar. The FIRE movement flips that around: your retirement age is a math problem you can solve, and the inputs are entirely in your control. This guide walks through how the FIRE Calculator above works, how to read its results, and how to use the numbers to make real decisions.
How to use this tool
Start with the four fields in Your Financial Snapshot: your current age, your current net worth or nest egg, your annual net (after-tax) income, and your annual living expenses. As soon as you type, the calculator works out your Annual Savings Amount (income minus expenses) and your Savings Rate (savings as a percentage of income). These two numbers are the engine that drives everything else.
Open Advanced Assumptions to fine-tune the three variables that affect how fast your money grows: your expected annual investment return, expected inflation, and your safe withdrawal rate. Sensible defaults (7% return, 2.5% inflation, 4% SWR) are pre-filled, but feel free to experiment, especially with the SWR, since it directly sets the size of the nest egg you are aiming for.
The results card shows your Age of Financial Independence in large type, along with your Target FIRE Number, the number of Years Left to Save, and your current savings figures. Click "Show Year-by-Year Nest Egg Projection" to see exactly how your balance is expected to grow, year by year, until it crosses your target.
How the calculation works
Your FIRE Number is simply your annual living expenses divided by your safe withdrawal rate: FIRE Number = Annual Expenses ÷ SWR. At the default 4% SWR, that is the same as multiplying your annual expenses by 25. Spend $40,000 a year and your target nest egg is $1,000,000. Spend $60,000 a year and the target jumps to $1,500,000.
Lowering your safe withdrawal rate to 3.5% raises your target to roughly 28.6x expenses. Raising it to 5% lowers your target to 20x expenses. Small changes to the SWR slider move your FIRE number, and therefore your FIRE age, by a meaningful amount.
To project your Compounding Timeline, the calculator runs a year-by-year simulation starting at your current age and current net worth. Each year, it applies a real rate of return, which is approximately your investment return minus inflation, to your existing balance, and then adds your annual savings amount. This keeps every number in the projection expressed in today's dollars, so a result of "$1,000,000" in year 20 represents $1,000,000 of today's purchasing power, not $1,000,000 of future, inflation-shrunk dollars. The loop stops, and your nest egg "hits target," the moment your projected balance reaches or exceeds your FIRE number.
What actually moves the needle
Of the four core inputs, your annual living expenses has an outsized effect because it appears twice: once in your savings amount (expenses subtracted from income) and once in your FIRE number (expenses divided by SWR). Cutting $5,000 a year from your budget both increases the amount you can save every year and reduces the size of the nest egg you need by $125,000 at a 4% SWR. That double effect is why many people pursuing FIRE focus heavily on reducing fixed costs like housing and transportation, which tend to be the largest recurring expenses.
Increasing your income helps too, but only the portion that becomes new savings. A raise that gets entirely absorbed into a bigger lifestyle (sometimes called "lifestyle creep") does nothing for your FIRE date. A raise that flows straight into your investment account, on the other hand, directly shortens your timeline.
Finally, your investment return and inflation assumptions matter most over very long timelines, where small differences compound into large gaps. A 1 percentage point difference in real return can shift a 30-year projection by several years. Because these are estimates about the future, it is worth occasionally revisiting this calculator with updated numbers as your life and the markets change.
Frequently Asked Questions
FIRE stands for Financial Independence, Retire Early. It is a strategy built on saving and investing a large portion of your income, often 30 to 70 percent, so that your investments eventually generate enough passive income to cover your living expenses for the rest of your life.
Once your invested nest egg reaches a target multiple of your annual spending, known as your FIRE number, you are considered financially independent and can choose to stop working for money entirely, even if you keep working by choice.
Your FIRE number is calculated directly from your annual living expenses, not your income. A high income with high spending can leave you needing a huge nest egg and a low savings rate, pushing retirement decades away. A modest income with low expenses can require a much smaller nest egg and free up a large savings rate, reaching financial independence far sooner.
Every dollar you avoid spending does double duty: it lowers the size of the nest egg you need, and it gives you more money to add to that smaller nest egg every year. That combination is why reducing expenses is often the fastest lever for moving up your retirement age, even faster than getting a raise.
The 4% rule comes from research, most notably the Trinity Study, which tested historical stock and bond returns to find a withdrawal rate that a retirement portfolio could sustain for roughly 30 years without running out of money in most historical periods. A 4% withdrawal rate corresponds to a nest egg equal to 25 times your annual expenses.
It became the default starting point because it held up across many decades of market history, including major downturns. However, it should be adjusted for your situation: a longer retirement, such as retiring in your 30s or 40s, generally calls for a lower, more conservative withdrawal rate like 3% to 3.5% (a 28x to 33x multiple), while a shorter retirement horizon, more flexible spending, or additional income sources like Social Security or part-time work can support a higher rate.
Lean FIRE and Fat FIRE both describe financial independence, but at very different spending levels. Lean FIRE means reaching independence on a tight, minimalist budget, often defined as annual expenses below roughly $40,000, which requires a smaller nest egg and can be reached faster through aggressive saving.
Fat FIRE means reaching independence while maintaining a comfortable or even lavish lifestyle, often with annual expenses well above $100,000, which requires a much larger nest egg and typically takes longer or requires a higher income. Between the two sits Coast FIRE and ordinary FIRE, which fall somewhere in the middle depending on your target lifestyle.
Estimates only, not financial advice: This calculator uses simplified, constant-rate assumptions about returns, inflation, income, and expenses. Real markets, salaries, and costs of living fluctuate from year to year. Use these results as a planning starting point, and consider speaking with a qualified financial advisor before making major retirement decisions.