Current Financial Snapshot
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$
$
Annual Savings: --   |   Savings Rate: --
FIRE Assumptions
Safe Withdrawal Rate 4.0%
Lower = more conservative. 4% is the classic starting point.
%
Use inflation-adjusted returns to keep everything in today's purchasing power (e.g., 7% nominal minus ~2-3% inflation = ~4-5% real).
Your FIRE Age
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years old
Enter your numbers above to calculate
Target FIRE Number
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Years to Financial Independence
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Current Savings Rate
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Key Terms Explained
FIRE Movement
Financial Independence, Retire Early. A lifestyle movement focused on high savings rates and intentional investing to retire decades before traditional age 65.
Safe Withdrawal Rate (SWR)
The percentage of your portfolio you can withdraw annually without running out of money over a long retirement. The most cited figure is 4%, though longer retirements often use 3% to 3.5%.
4% Rule
A guideline from the 1994 Trinity Study showing that withdrawing 4% of your portfolio annually has historically sustained a 30-year retirement through nearly all market conditions.
Savings Rate
The percentage of your after-tax income saved and invested each year. It is the single most powerful lever for accelerating your path to FIRE - more so than income level alone.
Compound Interest
Earning returns on your original savings plus all previously accumulated gains. The longer money compounds, the more dramatically it accelerates - this is the core engine behind FIRE math.
Inflation-Adjusted Return
Your investment return after subtracting the inflation rate. Using real returns keeps all figures in today's purchasing power so numbers stay meaningful across decades.
Coast FIRE
Having enough invested that compound growth alone - with no new contributions - will grow your portfolio to your FIRE number by traditional retirement age. You only need to cover current expenses.
Fat FIRE vs. Lean FIRE
Fat FIRE targets a high-expense, comfortable early retirement (often $80k+ per year). Lean FIRE minimizes expenses to retire sooner on a tighter budget, sometimes below $40k annually.

The Complete Guide to FIRE: Financial Independence, Retire Early

FIRE is not just a calculator exercise - it is a framework for rethinking the relationship between work, money, and time. The core insight is simple: if your investments can generate enough passive income to cover your annual expenses indefinitely, you no longer need a paycheck. This calculator finds that exact crossover point.

How to Use This Calculator

Start with your Current Financial Snapshot. Your current age sets the clock. Current Invested Assets includes everything already working for you: brokerage accounts, 401k, IRA, and similar investment vehicles. Annual After-Tax Income minus Annual Expenses gives your Annual Savings - watch that number update live as you type. The Savings Rate display tells you exactly what percentage of your income you are actually investing. In the FIRE Assumptions panel, set your Safe Withdrawal Rate (how much you will spend from your portfolio each year as a percentage) and your Expected Annual Return. Enter an inflation-adjusted return to keep all results in today's purchasing power.

How the FIRE Number is Calculated

Your FIRE Number is the total portfolio size needed to retire. The formula is: Annual Expenses divided by the Safe Withdrawal Rate. At 4% SWR and $45,000 in expenses, the FIRE Number is $1,125,000. That portfolio, invested in a diversified strategy, should produce $45,000 per year indefinitely - or sustain withdrawals for 30 or more years across nearly all historical market scenarios.

The calculator then runs a year-by-year simulation. Starting with your current assets, it adds your annual savings, applies the expected investment return via compounding, and checks whether the balance has crossed the FIRE Number. It repeats this loop and counts the exact number of years - including a precise fractional final year - until the target is reached.

Why Savings Rate Beats Income

A higher income accelerates FIRE only if it increases your savings rate. The savings rate is the real lever. Someone saving 50% reaches FIRE in roughly 17 years whether they earn $50,000 or $200,000, because both the savings amount and the required FIRE Number scale together proportionally. A high earner spending 90% of income is further from FIRE than a modest earner saving 40%, because expensive habits require a much larger portfolio to sustain.

Choosing the Right Safe Withdrawal Rate

The classic 4% rule was derived from 30-year retirement simulations using historical US market data. For early retirees planning a 40 to 50 year retirement, many financial planners suggest using 3% to 3.5% as a more conservative target. The lower the SWR, the higher your FIRE Number - but the safer your portfolio becomes once you retire. Use the slider to test different scenarios and find a balance that fits your risk tolerance and planned retirement length.

Frequently Asked Questions

Your savings rate determines both how fast your nest egg grows and how little you need to retire on. A higher income only helps if it translates into a higher savings rate. Someone earning $50,000 and saving 50% will reach FIRE faster than someone earning $200,000 and saving 10%, because the high earner has locked in a more expensive lifestyle that requires a larger FIRE number to sustain.
The 4% rule comes from the 1994 Trinity Study, which found that a portfolio of stocks and bonds could sustain a 4% annual withdrawal rate for at least 30 years across every historical market scenario tested. It remains a widely used starting point, though many early retirees use 3% to 3.5% for longer 40 to 50 year retirements or uncertain markets. Adjust the Safe Withdrawal Rate slider in this calculator to explore different scenarios.
Use after-tax income and after-tax expenses to keep the math clean and consistent. Your FIRE number needs to cover your actual spending, which comes from post-tax dollars. If you have significant traditional 401k or IRA balances, factor in future tax liability separately, as those withdrawals will be taxed as ordinary income in retirement.
This calculator uses inflation-adjusted (real) returns. Enter a return rate net of inflation - typically 4% to 5% for a diversified stock portfolio (7% nominal minus 2% to 3% inflation). This keeps all values in today's purchasing power so your FIRE number and timeline are directly comparable without needing separate inflation adjustments.