FIRE Calculator — Find Your Financial Independence Number

Understanding Financial Independence and Retire Early (FIRE)

The FIRE movement gained mainstream popularity through bloggers like Mr. Money Mustache and JL Collins, who demonstrated that retirement isn't an age — it's a financial number. Once your investment portfolio is large enough that the returns can cover your living expenses forever, you are financially independent. From that point on, working becomes a choice rather than a necessity.

The 4% Rule and Your FIRE Number

At the core of the FIRE calculation is the 4% Rule. Based on the widely cited Trinity Study, researchers found that if you withdraw 4% of a diversified portfolio composed of stocks and bonds during your first year of retirement, and adjust that withdrawal amount for inflation each subsequent year, your portfolio is highly unlikely to be depleted over a 30-year period.

By inverting this rule, you can calculate your FIRE number: simply take your annual expenses and multiply them by 25 (since 100 divided by 4 is 25). For example, if you spend $40,000 a year, your FIRE number is $1,000,000.

Savings Rate: The #1 Lever for Early Retirement

Your timeline to FIRE is heavily dictated by one crucial metric: your savings rate. This is the percentage of your take-home pay that you save and invest. If you save 10% of your income, you have to work 9 years to pay for 1 year of retirement. But if you increase your savings rate to 50%, every year you work pays for 1 year of retirement. The higher your savings rate, the shorter your path to financial independence.

Variations of FIRE

• Lean FIRE: Achieving financial independence with a minimalist lifestyle. Since your annual expenses are lower (often calculated at 75% of your current standard or just covering bare necessities), your target number is much smaller, allowing you to reach it significantly faster.
• Fat FIRE: Retiring with a larger portfolio designed to support a luxurious lifestyle, such as extensive travel or a high cost-of-living area. This is generally calculated at 150% or more of average expenses.
• Barista FIRE: Having enough saved so that your portfolio can cover most of your expenses, but choosing to work a lower-stress, part-time job (like at a coffee shop) to cover the remainder and gain access to health insurance.
• Coast FIRE: A major milestone where you have saved enough early on that, if left untouched to grow with compound interest, your portfolio will reach your traditional retirement goal. You stop contributing to investments and only need to earn enough to "coast" and cover current living expenses.