Retirement Calculator: Are You Saving Enough to Retire?

When Marcus turned 38, he sat down with a spreadsheet and two questions: how much money would he need to stop working at 65, and was he anywhere close? He had $52,000 in a 401(k), earned $78,000 a year, and contributed about 10% of his paycheck. His gut told him he was doing fine. The math told him a different story — he was on pace to fall roughly $400,000 short of what he would need to cover thirty years of retirement.

That gap did not appear because Marcus was irresponsible. It appeared because he had never run the numbers. Most people haven't. A recent survey found that fewer than half of American workers have ever tried to calculate how much they need to save. The retirement calculator above exists to close that blind spot in under a minute.

How the calculator works

The tool compares two numbers. The first — what you will have — projects how your current savings, contribution rate, and investment returns compound between now and your target retirement age. The second — what you will need — estimates the total nest egg required to cover your monthly expenses (adjusted for inflation) from the day you retire through the end of your life expectancy.

If the blue line sits above the green dashed line on the chart, you are on track. If it falls below, you have a gap to close — and the sooner you see it, the easier it is to fix.

Why starting early changes everything

Compound interest rewards the patient. Consider two coworkers, both earning $75,000 a year. Danielle starts contributing 12% at age 25. Her colleague, Omar, waits until 35 to begin the same routine. By 65, Danielle's portfolio has grown to roughly $1.9 million, while Omar's lands near $870,000 — less than half, despite only a ten-year head start.

The difference is not magic. It is time. Each extra year gives your returns a chance to generate their own returns. That is why even small increases in your twenties — bumping from 8% to 12%, say — can outweigh much larger adjustments made later. If you are already past 35, that does not mean the situation is hopeless. It just means the lever you pull needs to be bigger: a higher savings rate, a later retirement date, or both.

What "enough" actually looks like

Financial planners often cite the 4% rule as a shorthand: save 25 times your annual spending, withdraw 4% each year, and your money should last about 30 years. It is a useful benchmark, but the real world is messier. Healthcare costs spike in your seventies. Inflation does not hold steady at 3% every year. And Social Security may cover more — or less — than you expect.

That is why the calculator lets you enter your actual monthly budget in retirement instead of relying on rules of thumb. If you plan to spend $4,000 a month and expect $1,800 from Social Security, the tool calculates the gap you need your portfolio to fill. It then factors in inflation so the number reflects what those dollars will actually buy decades from now.

The contribution rate that moves the needle

Marcus's 10% savings rate was respectable but not enough. When he bumped it to 15%, his projected balance at 65 jumped by over $300,000 — enough to close nearly all of his shortfall. The takeaway is not that everyone needs to save 15%. It is that small changes in your contribution percentage have an outsized impact over decades.

Try adjusting the savings rate slider in the calculator above and watch the projection shift in real time. Going from 10% to 12% of a $75,000 salary adds just $125 a month to your retirement accounts, but over 30 years at a 7% return, that modest bump produces an additional $150,000 or more.

If your employer offers a 401(k) match, your effective contribution rate is already higher than the number you see on your paycheck. Factor that in when deciding whether you can afford to save more.

What if you are behind?

Being behind is not a death sentence — it is a starting point. There are three levers you can pull, and most people benefit from pulling more than one at a time.

Save more aggressively. If you are over 50, catch-up contributions let you put an extra $7,500 into your 401(k) each year — and starting in 2025, workers aged 60 to 63 can contribute an additional $11,250. These provisions exist specifically to help late starters close the gap.

Work a few extra years. Retiring at 67 instead of 62 does not just add five years of saving. It also removes five years of withdrawals and gives Social Security more time to grow. That triple benefit can swing the needle by hundreds of thousands of dollars.

Revisit your expected expenses. Many retirees spend less than they predicted, especially once the mortgage is paid off or they relocate to a lower-cost state. Open the advanced settings in the calculator and try different monthly expense figures to see how sensitive the result is.

Advanced settings worth exploring

The default assumptions in the calculator cover most people, but the advanced panel lets you fine-tune four important variables:

Life expectancy defaults to 88. If longevity runs in your family or you want an extra safety margin, push it to 92 or 95. Running out of money at 89 is a risk worth planning around.

Investment return is set at 7%. If you hold a conservative portfolio heavy on bonds, 5% may be more realistic. If you are decades from retirement and fully in equities, 8–9% has historical precedent — but higher assumptions mean higher risk if markets underperform.

Income growth at 2.5% assumes your salary keeps pace with inflation plus a small real raise. If you work in a field with steeper salary curves — tech, medicine, law — a higher figure may be appropriate.

Other retirement income is where Social Security, pensions, and rental income belong. Including even $1,500 a month in guaranteed income dramatically reduces the amount your portfolio needs to cover. Use our Social Security calculator to estimate your expected benefit.

Running the numbers is not a one-time event

The calculator gives you a snapshot, but life changes. A raise, a job loss, a new baby, a market crash — each one shifts the projection. Marcus revisits his numbers every January. The year he got promoted and bumped his salary by $12,000, he increased his contribution rate from 15% to 17% and watched his projected gap shrink to zero. The year the market dropped 20%, he saw the blue line dip below the green — and he left his contributions alone, knowing the recovery would follow.

The point is not to obsess over the number. It is to stay informed so you make decisions based on evidence, not anxiety. Bookmark this page, come back every six months, and update your inputs. Your future self will thank you.

Talk to someone who does this every day

A calculator shows you the math. An advisor builds the plan around it — the tax-efficient withdrawal sequence, the Social Security timing, the estate and insurance pieces that no calculator can automate. If the gap between what you will have and what you will need feels daunting, a qualified financial advisor can help you build a strategy to close it on a timeline that fits your life.