Retirement Calculator

What is an Inflation-Adjusted Retirement Calculator?

An inflation-adjusted retirement calculator projects whether your savings will last through your entire retirement by accounting for the real purchasing power of money over time. Unlike simple calculators that ignore inflation, this tool models how rising prices reduce what each dollar buys each year — a critical factor for retirees who may spend 20–30 years in retirement.

By combining your expected portfolio growth, annual withdrawals, Social Security income, and a realistic inflation rate, the calculator estimates exactly when — or whether — your portfolio will be depleted. This gives you an honest picture of your retirement readiness and helps identify whether you need to save more, spend less, or adjust your planned retirement age.

How to Use This Calculator

1. Enter your ages and savings. Input your current age, planned retirement age, and existing retirement savings balance. These define your accumulation window — the years your portfolio has to grow before withdrawals begin.
2. Set your contributions and return rate. Add your annual contribution and expected investment return. Consistent contributions during the accumulation phase have a dramatic compounding effect on your final portfolio size.
3. Define your retirement spending. Enter your expected annual spending in retirement, the duration of retirement, and optionally your monthly Social Security benefit. The calculator shows how SS income reduces the draw on your portfolio each year.
4. Review the depletion analysis. The results show your nominal and inflation-adjusted portfolio at retirement, plus the projected year your funds run out — or confirm that your savings will outlast your retirement horizon.

Frequently Asked Questions

How much do I need to retire?

The amount you need depends on your expected annual spending, retirement duration, and withdrawal rate. A common benchmark is the 25× rule: multiply your annual expenses by 25 to find the portfolio needed to support a 4% withdrawal rate. For example, $60,000 in annual spending requires a $1,500,000 portfolio. Longer retirements, higher inflation, or conservative investment returns may require a larger nest egg — this calculator models all of those variables together.

What is portfolio depletion?

Portfolio depletion occurs when your annual withdrawals — adjusted upward each year for inflation — exceed your portfolio's investment returns, drawing down the balance until it reaches zero. A portfolio that lasts beyond your planned retirement duration means your savings are adequate; one that depletes early signals a shortfall requiring action now, such as increasing contributions, reducing planned spending, or delaying your retirement date.

How does Social Security affect retirement?

Social Security income offsets a portion of your annual spending, reducing the amount you must withdraw from your portfolio each year. This smaller withdrawal rate allows your portfolio to compound longer and significantly extends its longevity. Even a modest benefit of $1,500/month ($18,000/year) can add years to a portfolio's life. This calculator lets you model retirement with and without Social Security so you can see the exact impact on your projected depletion date.

What is a safe withdrawal rate?

A safe withdrawal rate (SWR) is the percentage of your portfolio you can withdraw annually without running out of money over a given retirement period. The widely cited 4% rule targets a 30-year retirement. For longer retirements (35–40 years), a 3–3.5% rate is considered safer. For shorter retirements or those with significant supplemental income like Social Security, a 4.5–5% rate may be sustainable. Inflation adjustments are built into SWR calculations — you increase the dollar amount each year to maintain purchasing power.

How does inflation erode retirement savings?

Inflation steadily reduces the purchasing power of each dollar you withdraw. At 3% annual inflation, $60,000 in spending today requires $81,000 in ten years and $109,000 in twenty years to buy the same goods and services. For retirees, this means your withdrawal amount must increase each year just to maintain your standard of living — which accelerates portfolio depletion. Holding assets that grow faster than inflation, such as a diversified stock portfolio, is the primary defense against this erosion.