Retirement Number Calculator

Calculate exactly how much money you need to retire based on the 4% rule and your expected monthly expenses.

Calculate Your FIRE Number

Expected Monthly Expenses $4,000

Safe Withdrawal Rate 4%

Tool Disclaimer: This calculator is for educational purposes only. Projections are based on mathematical formulas and do not guarantee future results. All investments involve risk. We recommend consulting with a certified financial advisor before making significant decisions.

Everything you need to know about Retirement Number Calculator

Knowing exactly how much money you need to retire is the most important step in financial planning. This is often referred to as your "FIRE Number" (Financial Independence, Retire Early). It represents the total investment portfolio required to sustain your lifestyle indefinitely without ever needing to work for an active income again.

This Retirement Number Calculator uses the famous "Safe Withdrawal Rate" method (often called the 4% Rule) to determine your target. By inputting your expected monthly expenses in retirement, the calculator instantly determines the nest egg required to support that spending level.

The 4% Rule Explained

The 4% rule is a rule of thumb used to determine how much you can withdraw from your retirement portfolio each year without running out of money. It is based on historical stock and bond market returns. If you expect to withdraw 4% of your portfolio annually, your retirement number is simply your annual expenses multiplied by 25.

For example, if you need $48,000 a year to live comfortably ($4,000/month), you would need an investment portfolio of $1,200,000 ($48,000 x 25). If you want to be more conservative and use a 3% withdrawal rate, you would multiply by 33.3 instead.

Frequently Asked Questions

Yes, the original Trinity Study (which established the 4% rule) assumed that you withdraw 4% of the initial portfolio value in year one, and then adjust that withdrawal amount for inflation every subsequent year.

To be conservative, many FIRE practitioners calculate their number without assuming Social Security. However, if you are nearing traditional retirement age, you can subtract your expected annual Social Security benefits from your total annual expenses before calculating your number.