🔥 FIRE Calculator · Find your Financial Independence number and exactly when you can retire
🔥 What is FIRE? Financial Independence, Retire Early. The core idea: accumulate 25× your annual expenses (the "FIRE number") and withdraw 4% per year — historically sustainable indefinitely. This calculator helps you find your number and your timeline.
Step 1
Where You Stand Today
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When you want to stop working
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All investment accounts combined
Step 2
Income & Savings
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Enter your 401k + IRA + brokerage contributions
Step 3
Retirement & Growth
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What you'll spend per year once retired (today's dollars)
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4% is the classic "Trinity Study" rate. 3.5% is more conservative.
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Expected annual return during accumulation
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Expected return after retiring (more conservative)
YOUR FIRE NUMBER
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Years to FIRE
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FIRE Age
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Savings Rate
Progress to FIRE Number—
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FIRE Number
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25× annual expenses
Current Gap
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Remaining to accumulate
Monthly Needed to Hit Target Age
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📊 Savings Path to FIRE
📈 Retirement Portfolio Longevity
The chart below shows your portfolio from retirement through age 90, assuming you withdraw your target annual expenses each year. Green zone = sustainable.
FIRE Explained: Financial Independence, Retire Early — The Real Math
FIRE isn't about cutting every pleasure from your life. It's about accumulating enough invested assets that the returns can fund your lifestyle indefinitely — giving you the option to stop working for income, not the obligation to. The math is surprisingly simple, and once you understand the 4% rule and the savings rate relationship, your path becomes clear.
The 4% Rule: Foundation of FIRE Planning
The 4% rule originated from the Trinity Study (1998), which analyzed historical market data and found that withdrawing 4% of your portfolio per year — adjusted annually for inflation — had a 95%+ success rate across 30-year retirement periods. If you need $60,000/year to live, you need $1,500,000 invested (60,000 ÷ 0.04 = 1,500,000).
For longer retirements (40–50 years, which is common in FIRE), many experts recommend a more conservative 3–3.5% withdrawal rate. At 3.5%, a $60,000/year lifestyle requires $1,714,286. The extra cushion significantly improves survival odds across very long retirement periods.
Savings Rate: The Most Powerful Variable
Your savings rate — what percentage of your income you invest — is the single biggest determinant of when you reach financial independence. It works doubly: a higher savings rate means you accumulate faster and it means your target number is smaller (because you live on less).
At a 50% savings rate, you reach financial independence in approximately 17 years regardless of income. At 70%, roughly 8.5 years. At 25%, about 32 years. This is why the FIRE community is obsessed with expense control — it's the most controllable lever in the entire equation.
Sequence-of-Returns Risk
The biggest risk to FIRE plans isn't average returns — it's the sequence of those returns. Retiring into a bear market (2000–2002, 2008–2009) and withdrawing during down years can permanently impair a portfolio. This is why flexibility matters: being willing to reduce withdrawals by 10–20% during market downturns can dramatically extend portfolio survival.
Taxes in FIRE Planning
For early retirees, tax strategy is as important as investment strategy. Roth conversion ladders — converting Traditional IRA/401(k) money to Roth over the years before you need it — can dramatically reduce lifetime tax burden. In early retirement years when income is low, you may be in the 0% or 10% bracket, making conversions extremely tax-efficient.
Don't forget healthcare. Before Medicare eligibility at 65, early retirees need to plan for $5,000–$25,000/year in healthcare costs depending on coverage choices. ACA marketplace plans with income-based subsidies can significantly reduce this burden for those managing income strategically.