Retirement planning becomes more useful when the numbers answer two separate questions: how much your current savings path could produce and how much of a portfolio your retirement spending goal may require. Comparing those figures in today’s dollars keeps inflation from making the result look larger simply because future dollars buy less.
Retirement Calculator
Calculation details
| Years to retirement | - |
|---|---|
| Nominal return | - |
| Inflation assumption | - |
| Real annual return | - |
| Retirement spending goal | - |
| Social Security / pension income | - |
| Withdrawal-rate assumption | - |
Results are planning estimates in today's dollars, not a forecast or guarantee. Investment returns vary, inflation changes, retirement spending can differ from the amount entered, and Social Security or pension benefits may not track inflation in the same way. The withdrawal rate is a planning assumption rather than a promise that savings will last for life.
How to Use the Retirement Calculator
Start with your current age, planned retirement age, retirement savings and monthly contribution. Then estimate the monthly spending you want in retirement and the Social Security or pension income expected to cover part of that spending.
- Current retirement savings: Include accounts and investments you expect to use for retirement.
- Monthly contribution: Enter the amount saved each month in today’s purchasing power. The projection assumes you maintain roughly that real contribution over time.
- Monthly retirement spending goal: Estimate the lifestyle cost you want the plan to support, expressed in today’s dollars.
- Social Security / pension income: Enter a today’s-dollar monthly estimate of continuing retirement income.
Projection assumptions show the expected investment return, inflation rate and initial withdrawal rate directly in the calculator. Default values serve only as starting scenarios, not forecasts or recommendations, so testing different assumptions is part of reviewing the plan.
Personalized Social Security benefit estimates are available through a my Social Security account. Using that estimate is generally more useful than guessing from salary because Social Security benefits depend on the worker’s earnings record and claiming age.
How the Projection Works in Today’s Dollars
Nominal investment returns and inflation are converted into a real return before retirement. With a 6% nominal return and 2.5% inflation, the real return is not exactly 3.5%; the calculator uses the compounding relationship between the two rates.
Current savings compound at the resulting real rate, and monthly contributions are added at the end of each month. Investor.gov uses the same core planning inputs of an initial investment, regular monthly contributions, time and an estimated rate when illustrating compound growth.
Keeping the projection in today’s dollars changes how the contribution input should be read. Entering $600 per month means maintaining approximately $600 of today’s purchasing power rather than contributing the exact same nominal $600 decades from now. In practice, that implies gradually increasing the dollar contribution as prices rise.
A 35-year-old with $30,000 saved, a $600 monthly contribution and retirement at 67 has 32 years for the portfolio to grow. With a 6% nominal return and 2.5% inflation assumption, the modeled real return is about 3.41% per year.
Under those assumptions, projected retirement savings are about $501,000 in today’s dollars. Subtracting $2,000 of Social Security or pension income from a $4,500 monthly spending goal leaves $2,500 per month for the portfolio to cover.
How the Portfolio Target Is Estimated
Portfolio targeting begins with the part of retirement spending not covered by Social Security or pension income. Using a $4,500 monthly goal and $2,000 of other retirement income leaves a $2,500 monthly gap, or $30,000 per year, to be funded from savings.
An adjustable withdrawal-rate assumption converts that annual income gap into a portfolio target. At 4%, $30,000 of first-year portfolio income corresponds to a $750,000 target. Lowering the assumed withdrawal rate raises the target, while increasing it reduces the target.
No withdrawal-rate assumption can promise that a portfolio will last for life. Actual sustainability depends on market returns, inflation, spending changes, taxes, fees, asset allocation and the sequence in which investment gains and losses occur. For that reason, the calculator does not report a precise number of years that savings will last.
Other retirement income also deserves careful treatment. Social Security estimates can be obtained directly from the Social Security Administration, while pensions and annuities follow their own benefit and inflation-adjustment rules. Combining them into one field is convenient for planning, but users should check whether each source is expected to keep pace with inflation.
Using a Projected Shortfall or Surplus
Projected shortfall measures how much the portfolio target exceeds projected savings under the assumptions entered. Surplus appears when the modeled savings balance exceeds the target. Neither result is labeled “on track” or “behind” because those judgments would require more information about risk, taxes, health costs, spending flexibility and other resources.
Monthly contribution needed is more actionable than a generic status score. It solves for the contribution that would be required to reach the same portfolio target using the current savings balance, retirement date and real-return assumption.
Changing retirement age can also have a large effect because it changes the number of contribution and compounding periods. Investor.gov emphasizes the importance of time horizon in long-term investing; more time can allow regular contributions and compound growth to do more of the work.
Return assumptions deserve the opposite treatment. Raising the expected return can make almost any plan look better on screen, but investment returns are uncertain and higher expected returns generally come with additional risk. Testing a lower-return scenario is a useful way to see whether the plan depends heavily on optimistic assumptions.
What the Calculator Does Not Model
Taxes are not deducted from retirement spending or withdrawals. Traditional retirement accounts, Roth accounts and taxable investments can have very different tax treatment, so a single generic tax rate would create false precision.
Investment fees, employer-match rules, contribution limits, required minimum distributions and Social Security claiming strategies are also outside the calculation. Employer matching contributions can be included in the monthly contribution field when the goal is to model the total amount reaching retirement accounts.
Market volatility is another major omission. Constant real return is a simplifying assumption; actual portfolios experience uneven gains and losses. Investment risk and asset allocation should be considered alongside both time horizon and personal risk tolerance.
Retirement spending rarely stays perfectly flat either. Health care, housing, travel and family support can change over time. Running several spending scenarios is therefore more informative than treating a single target as a guaranteed budget.
For a specific savings target outside retirement, the Savings Goal Calculator can solve for a monthly contribution without the retirement-income assumptions used here.
Frequently Asked Questions (FAQs)
Why are the results shown in today’s dollars?
Today’s dollars make the projected balance and spending target easier to compare with current prices. Inflation is removed from the nominal investment-return assumption so the result represents approximate purchasing power rather than a larger future-dollar number.
Where should I get a Social Security estimate?
Through a personal my Social Security account, benefit estimates are based on the worker’s actual earnings record and can be compared across different claiming ages. Entering that estimate is more personalized than relying on a generic benefit assumption.
What withdrawal rate should I use?
No single rate works for every retirement. Four percent is only the default planning scenario, and the assumption can be changed. Lower withdrawal rates create larger portfolio targets; higher rates create smaller targets without guaranteeing that the money will last.
Why does the calculator not show how many years my savings will last?
Estimating a precise portfolio lifespan would require assumptions about future market returns, inflation, changing withdrawals and the order of gains and losses. Presenting one deterministic lifespan number can make the underlying retirement plan look more certain than it really is.
Does the monthly contribution include an employer match?
It can. Enter the total monthly amount expected to reach retirement savings if you want employer contributions included in the projection.
What happens if Social Security or pension income covers all planned spending?
With the entered spending gap fully covered by other retirement income, the modeled portfolio target becomes $0. Existing retirement savings still remain part of the projected balance and can provide flexibility for taxes, unexpected expenses or additional spending.