How to Use the FIRE Calculator

Our FIRE (Financial Independence, Retire Early) calculator helps you determine how long it will take to achieve financial independence using the 4% safe withdrawal rule. Simply enter your annual expenses, current portfolio, expected return rate, and monthly savings to see your path to FIRE.

Enter your annual expenses — how much you spend per year in retirement.
Set your current portfolio value — what you've already saved and invested.
Choose an expected return rate — a conservative estimate based on historical market returns.
Enter your monthly savings — how much you can save and invest each month.
Click "Calculate FIRE" to see your target net worth and estimated time to financial independence.

The 4% Safe Withdrawal Rule

The 4% rule, based on the Trinity Study, suggests that you can withdraw 4% of your portfolio annually in retirement without running out of money for at least 30 years. Your FIRE number is calculated as 25 times your annual expenses (100% / 4% = 25). For example, if you need $40,000 per year, you need a $1,000,000 portfolio.

FIRE Strategies

There are several approaches to FIRE: Lean FIRE (minimalist lifestyle with lower expenses), Fat FIRE (higher spending with a larger portfolio), Barista FIRE (part-time work to supplement a smaller portfolio), and Coast FIRE (enough saved that compounding will reach your target by retirement age without additional contributions).

Frequently Asked Questions

Is the 4% rule still valid? While some debate the 4% rule in today's low-yield environment, it remains a widely used benchmark. Many FIRE advocates use a more conservative 3-3.5% withdrawal rate for longer retirement horizons.

What is the difference between Lean FIRE and Fat FIRE? Lean FIRE involves living on a minimal budget (typically under $40,000/year), while Fat FIRE requires a larger portfolio to support higher annual spending (often $80,000+).

How does inflation affect my FIRE number? Inflation reduces purchasing power over time. Our calculator accounts for inflation by using real (inflation-adjusted) return rates. A 7% nominal return with 3% inflation gives a 4% real return.