FIRE Calculator
Find your Financial Independence, Retire Early number and how many years it could take to reach it at your current saving rate.
Frequently Asked Questions
What is the FIRE number?
It is the portfolio size that lets you live off withdrawals — usually annual expenses divided by your safe withdrawal rate (4% ≈ 25× expenses).
What is the 4% rule?
A guideline suggesting you can withdraw about 4% of your portfolio in year one, adjusting for inflation, with a high chance it lasts 30+ years.
Are the results guaranteed?
No. They depend heavily on your assumed returns and spending. Markets vary, so treat these as planning scenarios, not promises.
Understanding the FIRE Calculator
A FIRE (Financial Independence, Retire Early) calculator estimates the portfolio size you need to live off your investments and how many years it could take to reach it at your current saving rate. Enter your annual expenses, current savings, yearly contributions, and an expected return to see your FIRE number and a projected timeline. It is for people pursuing early financial independence. Results are educational estimates that depend heavily on your assumptions about returns, withdrawals, and spending; markets and inflation vary, so treat them as planning scenarios, not guarantees. All math runs in your browser.
How it works
Your FIRE number is usually annual expenses multiplied by 25, the inverse of the 4% safe-withdrawal rule, which suggests withdrawing about 4% of a portfolio yearly. The tool sets that target, then projects your savings forward: it compounds your current balance and adds annual contributions, growing as an annuity at your expected return, until the balance reaches the FIRE number. The number of years to get there is your timeline. A higher savings rate or return shortens it sharply; higher expenses raise the target. Choosing a more conservative withdrawal rate, such as 3.5%, raises the multiple and the required portfolio.
Worked example
Annual expenses of 40,000 imply a FIRE number of 40,000 × 25 = 1,000,000 at a 4% withdrawal rate. With 100,000 saved, 30,000 added each year, and a 6% real return, the balance grows past 1,000,000 in roughly 16 years. Cutting expenses to 32,000 lowers the target to 800,000 and shaves several years off, showing how spending less both reduces the goal and frees up more to invest.
Tips & common mistakes
- The 4% rule is a guideline from historical data, not a guarantee; sequence-of-returns risk can derail early retirement.
- Base your FIRE number on realistic future expenses, including healthcare, not just current spending.
- Use a real (after-inflation) return so the target stays in today's purchasing power.
- A higher savings rate shortens the timeline far more than chasing a slightly higher return.
- Consider a more conservative withdrawal rate (3-3.5%) for very long early-retirement horizons.
Sources & methodology
- • Trinity Study / Bengen — Safe withdrawal rate research, summarized at Investopedia (https://www.investopedia.com/terms/f/four-percent-rule.asp)
- • U.S. Securities and Exchange Commission, Investor.gov — Retirement planning basics (https://www.investor.gov)
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Reviewed by the TopOpenTools editorial team · Last updated June 2026. These tools provide general estimates for educational purposes only and are not financial, tax, insurance, investment, or medical advice. Verify important decisions with a qualified professional.