Retirement Number Calculator

This calculator is organized into three sections: your retirement goal, your current progress, and advanced assumptions.

First, establish your retirement baseline. Enter your expected Annual Expenses in retirement, in today's dollars. Then, add any other Annual Retirement Income you expect, such as Social Security or a pension. Finally, choose a Withdrawal Rate, which is the percentage of your savings you plan to withdraw each year. The 4% rule is a common starting point, but you can adjust this based on your risk tolerance. These three inputs determine your target retirement number.

Next, input your current progress. Add your Current Savings across all retirement accounts, like your 401(k) and Roth IRA. Enter your total Monthly Contribution to these accounts. Your Current Age and target Retirement Age define your saving timeline. Lastly, estimate your Expected Annual Return on investments. This is a crucial assumption for projecting future growth.

Finally, you can refine the projection using the advanced settings. Adjust the Inflation Rate to see how rising costs will impact your future expenses and your final retirement number. You can also add an Expense Growth Beyond Inflation rate to account for potential "lifestyle creep" — where your spending increases as your income grows over time.

Annual Expenses and Annual Retirement Income

These two numbers are the foundation of your retirement plan. Annual Expenses is your best estimate of how much you'll spend per year in retirement, expressed in today's dollars. The calculator will automatically adjust this for inflation. If you're unsure, a good starting point is 70-80% of your current pre-tax income. For a more precise figure, use our retirement expense calculator.

Annual Retirement Income includes any money you'll receive that doesn't come from your investment portfolio. This typically includes Social Security, pensions, annuities, or rental income. This income reduces the amount your portfolio needs to cover each year, which directly lowers your target retirement number. Use our Social Security calculator to get a better estimate of your future benefits.

Withdrawal Rate

The withdrawal rate is the percentage of your nest egg you plan to withdraw in your first year of retirement. This single percentage is a powerful lever that determines how much you need to save. A lower withdrawal rate is more conservative and provides a greater safety margin, but requires a larger portfolio. A higher rate requires less savings but increases the risk of running out of money. The most common starting point is the 4% rule, which you can explore with our 4% rule retirement withdrawal calculator.

Current Savings and Monthly Contribution

Current Savings is the total value of all your investment accounts intended for retirement. This includes workplace plans like 401(k)s, 403(b)s, and TSPs, as well as personal accounts like Traditional and Roth IRAs and taxable brokerage accounts. This is the starting point for your savings projection.

Monthly Contribution is the total amount you are actively saving for retirement each month. This figure, combined with your investment return and time horizon, determines how quickly your savings will grow. To see if you're saving enough, check our guide on how much to save for retirement each month.

Current Age and Retirement Age

Your Current Age and target Retirement Age determine your investment time horizon. A longer time horizon gives your contributions more time to benefit from compound growth, which can dramatically increase your final balance. Pushing your retirement age back by even a few years can significantly improve your plan's success rate. Use the retirement age calculator to see how different timelines affect your outcome.

Expected Annual Return

This is the average annual rate of return you expect your investments to generate before you retire. This is a long-term average, not a year-to-year guarantee. A diversified portfolio of stocks has historically returned an average of 7-10% per year, but past performance is not indicative of future results. A more conservative portfolio with a higher allocation to bonds would have a lower expected return. Your choice here has a major impact on the projection.

Inflation Rate and Expense Growth

The Inflation Rate is used to project how much your expenses will increase over time. A $50,000 lifestyle today will cost much more in 20 or 30 years. The historical average for inflation in the U.S. is around 2-3%, but it can vary significantly. Learn more about how inflation affects retirement savings.

Expense Growth Beyond Inflation accounts for "lifestyle creep." This is the tendency for spending to increase as income rises, even after accounting for inflation. If you expect your lifestyle to become more expensive over time, enter a small percentage (e.g., 1%). If you plan to maintain your current standard of living, you can leave this at 0%.

This calculator uses a two-part process. First, it determines your target retirement number. Second, it projects your savings to see if and when you will reach that number.

1. Calculating Your Retirement Number:

• The calculator starts by finding your "annual gap." This is the portion of your expenses that is not covered by other income sources like Social Security or pensions.
• Annual Gap = Annual Expenses - Annual Retirement Income
• It then uses your chosen withdrawal rate to calculate your retirement number in today's dollars. This is often called the 25x rule when using a 4% withdrawal rate (1 / 0.04 = 25).
• Retirement Number (Today's Dollars) = Annual Gap / (Withdrawal Rate / 100)
• Finally, it projects this number forward to your target retirement age, adjusting for both inflation and any expected lifestyle expense growth to find your true, future-dollar target.

2. Projecting Your Savings Growth:

• The calculator takes your current savings and projects it forward year by year until your target retirement age and beyond.
• Each year, it adds your total annual contributions (Monthly Contribution x 12).
• It then applies your Expected Annual Return to the new balance to calculate investment growth.
• This process repeats, demonstrating the power of compound interest over time.
• The calculator determines the age at which your projected savings balance first exceeds your inflation-adjusted retirement number. If this age is at or before your target retirement age, you are considered "on track."

This calculator provides a target-based projection and does not model post-retirement cash flow, taxes on withdrawals, or Required Minimum Distributions (RMDs). For a more detailed analysis, use the main retirement calculator.

The calculations are performed in a sequence to first establish the goal and then project your progress toward it.

Annual Gap and Retirement Number

First, the calculator determines the annual spending that your portfolio must support.

annual_gap_today = max(0, annual_expenses - annual_retirement_income)

retirement_number_today = annual_gap_today / (withdrawal_rate / 100)

Inflation-Adjusted Target

Next, the target number is adjusted for inflation and lifestyle growth to your retirement age.

years_to_retirement = retirement_age - current_age

total_growth_rate = (inflation_rate / 100) + (expense_growth_rate / 100)

expenses_at_retirement = annual_expenses * (1 + total_growth_rate) ^ years_to_retirement

income_at_retirement = annual_retirement_income * (1 + (inflation_rate / 100)) ^ years_to_retirement

annual_gap_at_retirement = max(0, expenses_at_retirement - income_at_retirement)

retirement_number_future = annual_gap_at_retirement / (withdrawal_rate / 100)

Savings Projection

The calculator projects your savings growth year by year using a future value formula.

annual_contribution = monthly_contribution * 12

annual_return_decimal = annual_return / 100

For each year y from now until retirement:

projected_savings_year_y = (current_savings * (1 + annual_return_decimal) ^ y) + (annual_contribution * (((1 + annual_return_decimal) ^ y - 1) / annual_return_decimal))

The calculator finds the first year where projected_savings is greater than or equal to retirement_number_future.

A Safe Withdrawal Rate (SWR) is the percentage of your savings you can withdraw each year in retirement without running a high risk of depleting your funds. It's a cornerstone of retirement planning, as it directly connects your annual spending to the total nest egg you need.

The most famous SWR is the "4% Rule." Based on a 1998 study called the Trinity Study, it suggests that you can withdraw 4% of your initial portfolio value in your first year of retirement, and then adjust that amount for inflation each subsequent year, with a high probability of your money lasting for at least 30 years. You can learn more in our guide, the 4% rule explained.

However, the 4% rule is not foolproof. It was based on historical U.S. market data and a specific asset allocation (typically 50-75% stocks). Critics argue that in an era of lower expected future returns and potentially higher inflation, a more conservative rate of 3% or 3.5% might be safer. Conversely, a more flexible withdrawal strategy could allow for a higher initial rate. This calculator lets you test different rates to see the impact on your target number. A lower rate means you need to save more, but it also builds a larger margin of safety into your plan.

The concept of a "retirement number" is central to the Financial Independence, Retire Early (FIRE) movement. For early retirees, the calculation is the same, but some assumptions become more critical. Read our beginner's guide to the FIRE movement for more context.

1. Lock In Your Expenses: The most important variable for FIRE is your annual spending. Since you'll be retiring early, you can't rely on assumptions about reduced work-related costs. You need a solid budget. 2. Choose a Conservative Withdrawal Rate: An early retirement could last 40, 50, or even 60 years. This longer time horizon exposes your portfolio to more market cycles and inflation risk. Many in the FIRE community use a more conservative SWR, such as 3.5% or even 3%, to increase the plan's durability. 3. The 25x Rule and Beyond: The 4% rule is often simplified to the "25x rule" (since 1 / 0.04 = 25). This means you need 25 times your annual expenses saved. If you opt for a 3.5% SWR, you'd need approximately 28.6x your expenses. A 3% SWR requires 33.3x. 4. Account for Healthcare: Early retirees are not yet eligible for Medicare. You must budget for potentially expensive private health insurance premiums until age 65. Our retirement healthcare cost calculator can help you estimate this.

Use this calculator to model your early retirement goal. Enter your target expenses and test a lower withdrawal rate (e.g., 3.5%) to see what your FI number would be. You can also explore different FIRE strategies with tools like the Coast FIRE calculator.

The calculator provides several key outputs to help you assess your plan.

Retirement Number: This is your primary target, shown in both future (inflation-adjusted) dollars and today's dollars. The future value is the actual amount you'll need on the day you retire, while the today's dollars value gives you a more intuitive sense of the goal.

Projected Savings: This shows what your portfolio is projected to be worth at your target retirement age if you continue your current savings and achieve your expected return. Comparing this to your retirement number instantly tells you if you're on track.

Progress Score & FI Reached At: The score gives you a percentage of how much of your goal you are projected to have saved by retirement. "FI Reached At" tells you the age at which your savings are projected to cross your target number. If this is before your planned retirement age, you're ahead of schedule.

Savings Growth Chart: This visualizes your journey, showing how your savings grow over time from contributions and compound growth. The chart clearly marks your retirement number, so you can see when your projected savings line will intersect it.

Withdrawal Rate Comparison Chart: This bar chart demonstrates how sensitive your retirement number is to your withdrawal rate. It's a powerful tool for understanding the trade-off between risk (higher SWR) and the amount you need to save.

Contributions vs. Growth Chart: This stacked area chart breaks down your projected balance into two components: the money you put in (contributions) and the money your money earned (investment growth). For long time horizons, you'll see that growth often makes up the majority of your final nest egg.

If your projection shows you're falling short of your goal, you have several levers you can pull to get back on track.

1. Increase Your Monthly Contribution: This is the most direct way to improve your outcome. Even small, consistent increases can lead to a much larger balance over time due to compounding.
2. Reduce Your Annual Expenses: Lowering your planned retirement spending directly reduces your target retirement number. A dollar not spent is a dollar you don't have to save. Create a retirement budget to find areas to cut back.
3. Work a Little Longer: Delaying your retirement age by a few years has a triple benefit: your money has more time to grow, you have more time to contribute, and your retirement period is shorter, reducing the total amount needed.
4. Re-evaluate Your Withdrawal Rate: If your goal seems unattainable, testing a slightly higher withdrawal rate (e.g., 4.25% instead of 4%) will lower your target number. Be aware that this increases your risk.
5. Find Other Income Sources: Increasing your expected income from sources like part-time work, rentals, or a pension reduces the burden on your portfolio and lowers your number.

When using a retirement number calculator, avoid these common pitfalls:

• Forgetting Inflation: A $1 million target today will not have the same purchasing power in 30 years. This calculator automatically adjusts for inflation, but it's a critical factor to remember in all planning.
• Ignoring Taxes: This simple calculator doesn't model taxes. If most of your savings are in pre-tax accounts like a Traditional 401(k) or IRA, your withdrawals will be taxed as income. This means you may need to withdraw more than your spending gap to cover taxes. Learn about tax-efficient withdrawal strategies.
• Using Unrealistic Returns: Don't assume a 12% annual return just to make the numbers work. Use a long-term, conservative estimate based on your asset allocation. Overly optimistic assumptions can lead to a false sense of security.
• Underestimating Expenses: Be honest about your expected retirement lifestyle. It's better to plan for slightly higher expenses and end up with a surplus than to underestimate and run short. Pay special attention to healthcare costs in retirement.
• Setting It and Forgetting It: Your retirement number is not a one-time calculation. Revisit it annually or whenever you have a major life change (new job, marriage, etc.) to ensure your plan stays on track.