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FIRE Calculator

Calculate your FIRE number, savings rate, and path to financial independence. See how many years until you can retire early, based on the 4% rule and your own numbers.

Planning estimate — no independent professional review is claimed. Check the documented method and sources before using the result for a financial decision.

Last updated August 24, 2026

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FIRE Calculator

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Financial independence isn't about a lottery-sized number, it's about knowing exactly how much you need, and exactly how long it will take at your current savings rate. This calculator walks you through your income, expenses, debts, and current savings, then models your path to FIRE (Financial Independence, Retire Early) using the same 4% safe withdrawal framework used by financial planners.

In about two minutes you'll get your FIRE number (the portfolio size that lets you stop working), your projected FIRE age, and a personalized Financial Freedom Score that scores your savings rate, debt load, emergency fund, and portfolio diversification. Then test "what-if" scenarios -- extra savings, lower expenses, a raise, to see exactly how much time each change actually saves.

How It Works

The calculator starts with the 4% rule, based on the 1998 Trinity Study (Cooley, Hubbard, and Walz) and later refined by William Bengen's SAFEMAX research. The rule holds that withdrawing 4% of a properly diversified portfolio in year one, then adjusting that amount for inflation each year after, has historically lasted 30+ years across nearly every rolling period in U.S. market history.

  1. FIRE number = your annual expenses ÷ 4% (equivalently, expenses × 25).
  2. Net worth = your investments, retirement accounts, and emergency fund, minus outstanding debt.
  3. Projection = your net worth compounds forward each year at your expected return minus inflation (your real return), plus your annual savings, until it reaches your FIRE number.
  4. Financial Freedom Score = a 0-100 blend of four factors: savings rate (40 pts), debt health (20 pts), emergency fund coverage (20 pts), and portfolio diversification (20 pts).

Every input can be adjusted at any time and the results update instantly -- nothing is submitted, saved, or sent anywhere.

Understanding Your Results

FI Score summarizes your overall readiness on a 0-100 scale. 70+ means you're in excellent shape; 40-69 means you have a solid foundation with room to optimize; below 40 flags a specific area, usually savings rate, debt, or emergency fund, worth addressing first.

Years to FI and FI age show when your projected net worth crosses your FIRE number, assuming your current savings rate and returns stay constant. Savings rate is the single biggest lever in the entire calculation -- small increases compound into years, not months, of time saved.

The Action Items tab ranks the highest-impact changes you can make right now. The What-If Scenarios panel lets you test any of them instantly.

Pros and Considerations

Benefits

  • •Free, instant, and requires no signup or personal data storage
  • •Models real-world levers -- savings rate, debt payoff, emergency fund, and portfolio mix -- not just a single net-worth number
  • •What-If scenarios show the exact time impact of small changes
  • •Based on well-established research: the Trinity Study and Bengen SAFEMAX withdrawal-rate research

Considerations

  • •Assumes a constant rate of return; real markets are volatile year to year
  • •Social Security is modeled as a simple annual offset beginning at an eligible projected FIRE age, not as a detailed claiming strategy
  • •A projection, not a guarantee — revisit your numbers regularly

Important Notes

  • •This calculator is for planning and educational purposes. It does not constitute financial, tax, or investment advice.
  • •Update your numbers at least once a year, or after any major income, expense, or life change.

Warnings

  • •Investment returns are never guaranteed and can vary significantly from the expected return you enter.
  • •A market downturn shortly before or after reaching your FIRE number carries outsized risk (sequence-of-returns risk) -- consider a more conservative withdrawal rate than 4% if this concerns you.

Frequently Asked Questions

What is FIRE?
FIRE stands for Financial Independence, Retire Early. It is a strategy of saving and investing enough that your portfolio can support your living expenses without depending on employment income.
What is the 4% rule?
The 4% rule is a retirement-planning guideline that starts annual withdrawals at 4% of a diversified portfolio, then adjusts that dollar amount for inflation. It is a planning estimate, not a guarantee.
What is Lean FIRE?
Lean FIRE targets financial independence with a deliberately low-cost lifestyle. This calculator models Lean FIRE at 70% of your current annual spending.
How much do I need to retire at 40?
Start with the annual spending you expect at age 40 and multiply it by 25 under the 4% rule. Then account for healthcare, taxes, a longer retirement horizon, and a safety margin appropriate to your circumstances.
What savings rate do I need for FIRE?
There is no universal rate, but a higher savings rate can shorten the timeline substantially. The calculator uses your actual take-home income, monthly savings, current assets, debts, and return assumptions to estimate your path.
What are Regular, Fat, and Barista FIRE?
Regular FIRE aims to maintain your current lifestyle, Fat FIRE plans for higher spending, and Barista FIRE combines a smaller portfolio with part-time income. This calculator lets you compare all four modes.
Does this FIRE calculator include Social Security?
Yes. You can add an estimated monthly benefit. The calculator applies it only when your projected financial-independence age is 62 or later.
How accurate is this FIRE calculator?
It is a planning model based on constant real returns and the inputs you provide. Markets, inflation, taxes, benefits, and spending vary, so review multiple scenarios and update your plan regularly.

Related Calculators

Retirement Savings CalculatorProject retirement savings with monthly contributions and a constant-return scenario, then compare the result with a 4% first-year withdrawal planning target.Net Worth CalculatorBuild a point-in-time personal balance sheet by totaling assets and liabilities, with category summaries and an asset-to-debt ratio.Compound Interest CalculatorCalculate how your money grows over time with compound interest -- model recurring contributions, compounding frequency, fees, and inflation to see your real future balance.

Related FinanceFirst Research

The State of American Retirement Readiness: 2026 ReportOnly 35% of non-retirees said their retirement plan was on track in the Federal Reserve 2025 survey. BLS found 72% of private-industry workers had access to retirement benefits in March 2025, while 53% participated.

Terms Used in This Calculator

FIRE (Financial Independence, Retire Early)FIRE stands for Financial Independence, Retire Early, a lifestyle movement focused on aggressive saving and investing to accumulate enough wealth to cover living expenses indefinitely without traditional employment. The core principle is saving 50-70% of income and investing in low-cost index funds to reach a portfolio 25 times your annual expenses.Compound InterestCompound interest is the interest calculated on both your initial principal and the accumulated interest from previous periods. Unlike simple interest (calculated only on the original amount), compound interest causes your money to grow exponentially over time, making it one of the most powerful forces in personal finance.Net WorthNet worth is the total value of everything you own (assets) minus everything you owe (liabilities). It is the single most comprehensive measure of your financial health, providing a snapshot of your overall financial position at any given point in time. A positive net worth means your assets exceed your debts, while a negative net worth means you owe more than you own.

References

  1. Cooley, Hubbard & Walz (1998) -- Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable (the Trinity Study)
  2. William Bengen -- Determining Withdrawal Rates Using Historical Data (SAFEMAX research)
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