Retirement Savings Calculator

How Much Will You Have at Retirement? Find Out in 30 Seconds

Retirement planning is one of those topics where most people have a vague intention to "sort it out later" until later starts looking alarmingly close. The challenge isn't that the math is complicated—it's that projecting decades of compound growth while accounting for monthly contributions requires more than mental arithmetic, and most people don't open a spreadsheet every time they want to do a quick scenario check. Our free retirement savings calculator solves this by turning your current age, target retirement age, existing savings balance, monthly contribution amount, and expected annual return rate into a projected retirement nest egg—instantly, privately, and without any account or financial software required.

The number the calculator produces gives you a concrete baseline for evaluating whether your current savings trajectory is aligned with your retirement income goals. If the projected balance looks insufficient, you have clear levers to adjust: contribution amount, retirement age, or investment allocation. Seeing the output of different scenarios side by side—what happens if you contribute $200 more per month, or retire at 67 instead of 65—is far more motivating than abstract advice about saving "more" and starting "earlier."

How the Retirement Savings Projection Is Calculated

The calculator combines two standard financial formulas to produce the projected retirement balance. The first component is the future value of your current existing savings, growing at your specified annual return rate for the number of years until retirement: FV of Current Savings = Current Savings × (1 + Annual Rate)^Years to Retirement.

The second component is the future value of your ongoing monthly contributions—an annuity calculation that compounds each monthly payment at the monthly equivalent of your annual return rate over the full period: FV of Contributions = Monthly Contribution × [((1 + r)^n − 1) ÷ r], where r is the monthly interest rate (annual rate ÷ 12) and n is the total number of monthly contribution periods (months until retirement). Adding both components gives your projected total retirement balance. This is the standard future value of a mixed cash flow calculation used in financial planning software worldwide.

The 4% Rule: Turning Your Balance Into Retirement Income

Your projected retirement balance is only useful when translated into sustainable annual income. The most widely cited framework for this translation is the 4% rule, derived from the Trinity Study published by finance professors at Trinity University in 1998. The study found that a portfolio withdrawal rate of approximately 4% per year has historically sustained a portfolio for at least 30 years across nearly all historical market conditions, including periods of high inflation and severe market downturns.

Applying the 4% rule to your projected balance is straightforward: multiply your balance by 0.04 to estimate your sustainable annual withdrawal amount. A projected retirement balance of $800,000 supports approximately $32,000 per year in withdrawals. A $1.5 million balance supports approximately $60,000 per year. Add your projected Social Security income on top of this figure to arrive at your estimated total annual retirement income—then compare that to your estimated retirement spending needs to assess whether your current savings trajectory closes the gap.

The 4% rule has been subject to ongoing academic debate, particularly in low-yield interest rate environments. Some updated research suggests 3% to 3.5% as a more conservative withdrawal rate for 30+ year retirements in current market conditions, while others argue that flexibility—reducing withdrawals in down years—allows for sustainable rates closer to 5%. The 4% figure remains a useful planning benchmark even if the precise percentage requires adjustment for individual circumstances.

How Much Do You Need to Retire? Understanding Your Target Number

Before the calculator can tell you whether you're on track, you need a target number to aim for. Most financial planners suggest estimating your desired annual retirement spending, then working backward to determine the portfolio size that would sustain it.

A common starting point is replacing 70% to 80% of your pre-retirement income, based on the assumption that retirees typically spend less on work-related expenses, commuting, and professional clothing while spending more on healthcare and leisure travel. However, this rule of thumb has significant limitations—it works reasonably well for people with straightforward retirement plans but may underestimate needs for those planning extensive travel, supporting adult children, or facing above-average healthcare costs.

A more precise approach is to build a detailed estimate of your expected annual retirement expenses across housing, food, healthcare, insurance, transportation, travel, entertainment, and gifts. Once you have that number, divide it by 0.04 (the 4% rule applied in reverse) to get your required portfolio size. If you plan to spend $75,000 per year in retirement and expect $20,000 annually from Social Security, you need your portfolio to sustainably provide $55,000 per year, which implies a required portfolio of $55,000 ÷ 0.04 = $1,375,000.

The Impact of Monthly Contribution Increases

One of the most powerful uses of this calculator is modeling the long-term impact of small increases in monthly contributions—not just to understand the math but to feel the actual dollar difference that small behavioral changes produce over decades.

Consider a 35-year-old with $25,000 in savings contributing $400 per month toward retirement at a 7% average annual return, targeting retirement at 65. That trajectory produces approximately $665,000 at retirement. Increasing the monthly contribution by just $100—to $500 per month—pushes the projected balance to approximately $795,000. A $200 increase to $600 per month reaches approximately $925,000. That $200 additional monthly contribution, made consistently for 30 years, generates an additional $260,000 in retirement wealth. Running this calculation concretely, as our tool enables in seconds, is often the push that motivates people to actually increase their contribution rather than planning to do it "eventually."

Account Types and Tax Considerations

The calculator projects raw growth without accounting for taxes, which is an important dimension to understand separately. Your effective after-tax retirement balance depends significantly on the account types holding your savings. Traditional 401(k) and IRA contributions reduce your current taxable income but are taxed as ordinary income when withdrawn in retirement. Roth 401(k) and Roth IRA contributions are made with after-tax dollars but grow and withdraw tax-free. A combination of pre-tax and Roth accounts provides tax diversification in retirement—the ability to manage your taxable income each year by drawing selectively from taxable and tax-free accounts.

For planning purposes, our projected balance represents the gross value of your retirement accounts before any taxes that may apply at withdrawal. If most of your savings are in traditional pre-tax accounts and you expect a 20% to 25% effective tax rate in retirement, your spendable after-tax balance will be roughly 75% to 80% of the projected figure. Factor this into your target balance calculation accordingly.

Completely Private, Always Free

All calculations run locally in your browser. Your age, savings balance, contribution amount, and financial projections are never transmitted to any server or stored anywhere. The tool is completely free with no account required. Use it to check your retirement trajectory now, then revisit it annually as your balance grows, your contribution changes, or your target retirement age shifts.