🔥 FIRE Number Calculator

What's your number for financial freedom?

Last updated: March 2026

* This calculator is for educational purposes only and does not constitute financial advice.

The FIRE (Financial Independence, Retire Early) movement is based on a simple idea: if you save enough money so that your annual returns cover your living expenses, you can stop working. The common guideline is the 4% rule — the amount you can withdraw annually from your portfolio without depleting it — based on the Trinity Study that examined portfolio performance over 30+ year periods.

Our FIRE calculator uses real returns (after inflation) — the default 5% reflects roughly 8% nominal returns minus 3% inflation. This means your FIRE number represents actual purchasing power, so you won't be surprised when today's expenses cost much more in 20 years.

Enter how much income you need per month to live without working, annual withdrawal rate (4% is recommended), monthly savings, current savings (including retirement accounts like 401(k), IRA, and brokerage accounts), and expected real annual return (5% after inflation is a conservative benchmark). The calculator will show your FIRE number and how many years it will take to reach it.

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FAQ

What is FIRE?

FIRE (Financial Independence, Retire Early) is a movement aimed at achieving financial independence as early as possible, so you no longer need to work to fund your living expenses.

What is the 4% rule?

The 4% rule, based on the Trinity Study, states that if you withdraw 4% of your investment portfolio annually, the money is expected to last at least 30 years. Therefore, your 'number' is the monthly income you need × 12 × 25.

Why does the calculator use real returns (5%) instead of nominal (8%)?

Because inflation erodes the value of money. $6,000/month today will buy much less in 20 years. Real returns (after inflation) ensure your FIRE number represents actual purchasing power — so you won't be caught off guard when prices rise.

How do Social Security and 401(k) affect my FIRE number?

Social Security income and 401(k)/IRA withdrawals reduce the amount your portfolio needs to cover. Factor these into your monthly income needs. If you plan to retire before 59½, you'll need bridge funds for early years.

What are the different types of FIRE?

Lean FIRE — living frugally on $2,000-3,000/month. Fat FIRE — maintaining a high standard of living ($8,000+/month). Barista FIRE — partial independence with a low-stress job covering some expenses. Coast FIRE — stop saving because your portfolio will grow to your target by retirement age.

How much do I need to retire early in the US?

It depends on your lifestyle. At $5,000/month expenses with the 4% rule, you need $1,500,000. At $8,000/month — $2,400,000. Factor in healthcare costs before Medicare (age 65), which can add $500-1,000/month.

What is the biggest risk to early retirement?

Sequence of returns risk — a major market crash in the first few years of retirement can permanently deplete your portfolio. Mitigate by keeping 2-3 years of expenses in cash/bonds and having flexible spending rules (e.g., withdraw less in down years).

Is this better than an index fund?

Compare your results to investing in a S&P 500 at ~10% annually. Use this as a baseline to evaluate your investment decision.

How much has procrastination cost you? Find out with the Cost of Waiting Calculator

📊 Data source: Standard financial models. Prices and data in this article are reviewed and updated semi-annually. Last update: March 2026.

🔥 When Can You Quit? Discover Your FIRE Number

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📊 Financial Planning

Created by Amiel Riss | SmartMoney77

Who Is This Calculator For?

Early-career savers

You're in your 20s or 30s, earning a steady income, and wondering: "Could I actually retire early?" This calculator gives you a concrete number to aim for and shows how many years it will take at your current savings rate.

Mid-career professionals

You've been saving for a while but never had a clear target. Plugging in your real expenses and current savings gives you a realistic timeline — and shows how much even small increases in your savings rate can shorten the path.

Anyone considering a major life change

Thinking about switching to part-time work, starting a business, or moving abroad? Your FIRE number tells you exactly how much you'd need saved before making that leap.

What This Calculator Does Not Include

Healthcare costs

If you retire before qualifying for government healthcare (e.g., Medicare at 65 in the US), you'll need to budget for private health insurance. This can add 5,000–15,000/year per person depending on your country and coverage level.

Sequence-of-returns risk

A 30% market crash in your first year of retirement is far more damaging than the same crash in year 15. The 4% rule accounts for average historical sequences, but your specific timing matters.

Taxes on withdrawals

Tax treatment of retirement withdrawals varies by country, account type (401k, ISA, pension), and withdrawal strategy. Your actual spending power may be 15–30% less than the gross withdrawal amount.

Inflation over long horizons

The 4% rule builds in inflation adjustments, but 30+ year retirements face significant uncertainty. What costs 4,000/month today may need 7,000/month in 20 years at 3% inflation.

Bridge years

If you retire at 40 but government pensions (Social Security, state pension) don't start until 62–67, you need to fund that gap entirely from personal savings. This is the most commonly underestimated cost in early retirement planning.

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