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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.

Last updated July 4, 2026

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FIRE Calculator

This interactive calculator is being built. The content and educational material below is already available while we finish the tool.

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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
  • •Does not explicitly model taxes, healthcare costs, or Social Security
  • •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 the practice of saving and investing aggressively, often 25-70% of income, so your portfolio can eventually cover your living expenses indefinitely, giving you the option to stop working long before traditional retirement age.
What is a FIRE number?
Your FIRE number is the portfolio size needed to sustain your lifestyle using the 4% withdrawal rule: annual expenses divided by 4%, or expenses multiplied by 25. Someone spending $40,000 a year would need roughly a $1,000,000 FIRE number.
Is the 4% rule still valid in 2026?
The 4% rule remains a reasonable starting point, but most planners now treat it as a rule of thumb rather than a guarantee. Sequence-of-returns risk, lower expected future returns, and longer time horizons (someone retiring at 35 may need 50+ years of withdrawals) lead many FIRE practitioners to use 3.25-3.75% for extra safety margin.
What savings rate do I need to reach FIRE?
Your savings rate, not your income, determines your timeline. At a roughly 4% real return, a 15% savings rate takes about 43 years to FIRE; 50% takes about 17 years; 70% takes under 9 years. Use the calculator's What-If panel to see your own numbers.
What are Lean, Fat, Coast, and Barista FIRE?
Lean FIRE targets a smaller number tied to a minimalist budget, often under $40,000 a year. Fat FIRE targets a larger number to sustain a more comfortable lifestyle. Coast FIRE means you have saved enough that compound growth alone will reach your number by traditional retirement age, even with zero further contributions. Barista FIRE means you have saved enough to cover most expenses but keep part-time work for income and benefits.
Should I pay off debt before pursuing FIRE?
Generally, pay off anything above roughly 7% interest before investing extra, since that is a guaranteed after-tax return most portfolios cannot consistently beat. Lower-rate debt, such as many mortgages, can reasonably be carried alongside investing.
How accurate is this calculator?
It models a straightforward, constant-return compounding projection, useful for planning direction and comparing scenarios, but it cannot predict market sequence, real inflation, tax law changes, or life events. Revisit your numbers at least once a year.
Can I really reach FIRE on a $500,000 portfolio?
Yes, if your annual expenses are around $20,000, since the 4% rule means $500,000 x 4% = $20,000 a year. This is realistic for Lean FIRE in a low cost-of-living area, but tight for most households -- check your own expense total in the calculator above.
What happens to my FIRE plan if the market crashes?
A market downturn early in retirement is the single biggest risk to the 4% rule, known as sequence-of-returns risk. Common safeguards include holding 1-2 years of expenses in cash, using a flexible withdrawal rate that dips in down years, or keeping some part-time income (Barista FIRE) as a buffer.
How much money do I actually need to retire early?
It depends entirely on your annual expenses, not a fixed number. Multiply your expected yearly spending by 25 (the 4% rule) to get a starting estimate, then adjust for your own risk tolerance, healthcare costs before Medicare eligibility, and how many years you expect to be retired.

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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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