FIRE Number Calculator

The FIRE movement, short for Financial Independence Retire Early, has gained significant traction among people who want to take control of their financial future and free themselves from mandatory employment decades before traditional retirement age. At the heart of this movement is a single number: your FIRE number, the total invested portfolio value at which you can safely cover your living expenses indefinitely through investment withdrawals alone.

The most widely used framework for calculating this number is the 25x rule, which is derived from the 4% safe withdrawal rate. Research based on historical market data suggests that if you withdraw 4% of your portfolio in the first year of retirement and adjust for inflation each subsequent year, your money has a high probability of lasting at least 30 years. Dividing your annual expenses by 0.04, or equivalently multiplying by 25, gives you the investment target needed to sustain that withdrawal rate.

For example, if your annual living expenses total $50,000, your FIRE number would be $1,250,000. Once your invested assets reach that level, you could theoretically stop working and live off portfolio withdrawals. Some practitioners prefer a more conservative 3.5% or 3% withdrawal rate for added safety, which results in a higher target but greater long-term security.

Understanding your FIRE number provides clarity and direction. It transforms a vague desire for financial freedom into a concrete, measurable goal. Use this calculator to enter your annual expenses and preferred safe withdrawal rate. The tool will compute your FIRE number and the monthly passive income needed to cover your lifestyle.