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FIRE Number Calculator — Financial Independence Retirement Calculator

Calculate your FIRE number — the exact portfolio size needed for financial independence — and see how many years until you reach it at your current savings rate.

Quick answer: A FIRE number is the portfolio size needed to cover annual spending, often estimated as annual expenses divided by a safe withdrawal rate. Adjust the rate for risk, taxes, and flexibility.

SWReviewed by SwitchWize Research Desk · Last reviewed July 16, 2026
Your FIRE Number
$1,500,000
Your FIRE Number
$1,500,000
Signed Gap to FIRE Number
$1,400,000
Estimated Years to FIRE
21
Monthly Investment Needed (10 yrs)
$7,861
Breakdown
$1,500,000total
Current Portfolio$100,000
Gap to FIRE Number$1,400,000
Total$1,500,000
Diagnostic

To hit your goal, you need to plan around $1,500,000.

Lock this number into your Money Map and we'll track progress.

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What to do next

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Your action plan
  1. 1

    Set the target and timeline for this plan

    Estimate a withdrawal-rate target and savings timeline with funded-goal and zero-return safeguards.

  2. 2

    Check the assumptions before using the result for a high-stakes decision

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

Calculator action path

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Frequently Asked Questions

Everything you need to know.

What is the 4% rule?
The 4% rule comes from the 1994 Trinity Study — research showing that a 50%+ stock portfolio can support 4% annual withdrawals, inflation-adjusted, for 30+ years with 95%+ historical success. Your FIRE number is 25× your annual expenses.
What is lean FIRE vs fat FIRE?
Lean FIRE means retiring on less — typically under $40,000/year — requiring a smaller portfolio (~$1M) but demanding frugality. Fat FIRE means retiring with $100,000+/year in spending, requiring $2.5M+ portfolio. CoastFIRE means having enough invested that growth alone will reach FIRE without additional contributions.
Is the 4% rule still valid with current interest rates?
Research published in 2021 by Morningstar suggests the safe withdrawal rate may be closer to 3.3% for new retirees given lower expected bond returns. Many FIRE practitioners use 3.5% as a conservative buffer. A 3.5% withdrawal rate means 28.6× annual expenses as your FIRE number.
Is the FIRE Number Calculator — Financial Independence Retirement Calculator free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the FIRE Number Calculator — Financial Independence Retirement Calculator affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to explore investing accounts, or run Money Map to compare this investing & retirement decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (general) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

Financial independence is not about income. It's about the ratio of portfolio to annual spending. The 4% rule gives a precise, research-backed target — and your current trajectory tells you exactly when you'll hit it.

How to Use It

  1. 1Enter your expected annual spending in retirement
  2. 2Adjust safe withdrawal rate (4% is the research standard)
  3. 3Enter current savings and annual investment amount
  4. 4See your FIRE number and estimated timeline
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