FIRE Calculator – Calculate Your Financial Independence & Early Retirement Number
The FIRE Calculator helps you determine your Financial Independence, Retire Early (FIRE) number — the total portfolio size you need to never work again. By entering your income, expenses, savings, and expected returns, you can instantly see how many years stand between you and financial freedom. Whether you're pursuing Lean FIRE, Fat FIRE, or Coast FIRE, this tool gives you a clear, data-driven roadmap.
Your current age in years.
Total value of your current investment and retirement accounts.
Your total yearly income before taxes.
How much you spend per year. This determines your FIRE number.
How much you invest or save each year toward FIRE.
Expected average annual return on investments (nominal). 7% is a common historical stock market average.
Expected average annual inflation. 3% is a common assumption.
The percentage of your portfolio you plan to withdraw annually in retirement. 4% is the classic Trinity Study rate.
Your results will appear here
How to Use This Calculator
1. Enter your current age and total invested savings or investment portfolio value. 2. Input your annual gross income and your annual living expenses — your expenses are the most critical number since they determine your FIRE target. 3. Enter how much you contribute to investments each year. 4. Adjust the expected annual investment return using the slider (7% is the historical average for a diversified stock portfolio). 5. Set your expected inflation rate (3% is a common default). 6. Select a safe withdrawal rate — the classic Trinity Study recommends 4%, but more conservative savers use 3% or 3.5%. 7. Click Calculate to instantly see your FIRE number, years to retirement, projected FIRE age, savings rate, and expected monthly passive income.
What Is the FIRE Movement?
FIRE stands for Financial Independence, Retire Early. The core idea is to save and invest aggressively — typically 50–70% of your income — so that your investment portfolio grows large enough to fund your lifestyle indefinitely without needing a paycheck. Adherents aim to retire decades before the traditional age of 65.
How Is the FIRE Number Calculated?
Your FIRE number is the total portfolio value you need to sustain your lifestyle in retirement. It is derived from the 4% Safe Withdrawal Rate (SWR), popularized by the Trinity Study (1998):
FIRE Number = Annual Expenses ÷ Withdrawal Rate
For example, if you spend $50,000 per year and use a 4% withdrawal rate:
FIRE Number = $50,000 ÷ 0.04 = $1,250,000
What Is the Safe Withdrawal Rate?
The safe withdrawal rate (SWR) is the percentage of your portfolio you can withdraw each year without running out of money over a 30+ year retirement. The Trinity Study found that a 4% withdrawal rate had a very high historical success rate across diverse market conditions. More conservative planners use 3–3.5%, especially for very early retirements spanning 40–60 years.
How We Calculate Years to FIRE
This calculator uses the real rate of return (investment return minus inflation) to project your portfolio growth year by year, adding your annual contribution each year until the portfolio reaches your FIRE number. The real return formula is:
Real Return = ((1 + Nominal Return) ÷ (1 + Inflation Rate)) − 1
Types of FIRE
- Lean FIRE: Retiring on a minimal budget, often under $40,000/year. Requires a smaller FIRE number but demands frugality.
- Fat FIRE: Retiring with a comfortable or luxurious lifestyle, typically $100,000+/year in expenses.
- Barista FIRE: Reaching partial financial independence and covering remaining expenses with part-time work.
- Coast FIRE: Saving enough early so that compound interest alone will grow your portfolio to your FIRE number by traditional retirement age, with no further contributions needed.
Why Your Savings Rate Matters Most
Your savings rate is the single most powerful lever in reaching FIRE. A person saving 10% of income may need 40+ years to retire, while someone saving 50% may reach FIRE in 15–17 years. Higher savings simultaneously reduces your required FIRE number (lower expenses) and accelerates portfolio growth.