Retirement may feel decades away, but the single biggest lever on how comfortable it will be is the gap between today's savings and the date you stop working. This retirement calculator projects your nest egg at the age you choose, starting from what you have already saved, what you plan to add each year, and a realistic expected investment return. Move any slider and the result recalculates instantly, so you can see what retiring at 62 versus 67 is actually worth — or what one extra percent of return does over thirty years.
How to Use
- Enter your Current Age. The clock only runs forward from here, so this number anchors everything else.
- Set your Retirement Age. The default is 65, but try sliding it to 62 and then 67: a few years on each side changes the result dramatically, both because the money has more or less time to compound and because you have fewer or more years to contribute.
- Type your Current Retirement Savings — the combined balance of your 401(k), IRA, Roth IRA, and any taxable brokerage accounts you have earmarked for retirement.
- Set your Annual Contribution. Include every dollar you add in a year, plus any employer 401(k) match, which is free growth that most people forget to count.
- Choose an Expected Annual Return. A diversified portfolio of stocks and bonds has historically averaged roughly 7% per year after inflation. If you want a conservative stress test, drop it to 4%; set it to 0% to see what happens if markets simply never grow.
The result card then breaks your future nest egg into three parts: the future value of the savings you already have, the future value of all your future contributions, and the total money you put in versus the extra growth investment returns earned. That split matters because it shows you how much of your retirement is really built by compounding rather than by your paycheck.
The Math Behind the Nest Egg
Two classic formulas combine here. The first is the future value of a lump sum: money you already have invested grows with compound interest.
FV lump = P × (1 + r)ⁿ
Where P is your current savings, r is the annual return, and n is the number of years until retirement.
The second is the future value of an ordinary annuity: regular annual contributions made at the end of each year.
FV annuity = C × ((1 + r)ⁿ − 1) / r
Where C is your annual contribution. When r is 0%, the division by zero is avoided by simply multiplying C × n — your contributions add up dollar-for-dollar with no growth.
Your projected nest egg is the sum of the two. Worked example for a 30-year-old retiring at 65 with $50,000 saved, $12,000 contributed each year, and a 7% return: n = 35 years. The $50,000 lump sum grows to about $533,829, and the 35 years of $12,000 contributions grow to about $1,658,843. Add them together and the projected nest egg is roughly $2,192,672 — even though you personally only put in $470,000 of your own money. The rest is compounding doing the heavy lifting.
Why Starting Early Matters
Notice what happens when the timeline shifts. Two people both retire at 65 and both end up with the same nest egg, but one starts at 25 and the other at 35. The late starter usually has to contribute nearly twice as much every year just to catch up. This is the core insight of compound interest: money saved in your twenties has four decades to double, while money saved in your forties has barely two. The calculator makes this concrete — lower your current age by five years and watch the projected total jump, often by hundreds of thousands of dollars.
A second, less obvious lever is your retirement age. Working just two or three years longer does three things at once: it shortens the payout window, it adds three more years of contributions, and it gives the whole balance three extra years of compounding. Many people are surprised to find that retiring at 67 instead of 62 produces a nest egg that is 30–40% larger.
Examples
Example 1 — The default saver. A 30-year-old has $50,000 saved, contributes $12,000 per year, and expects a 7% return. At age 65 the calculator projects a nest egg of about $2,192,672. Of the money that ends up there, only $470,000 is out-of-pocket contributions; the remaining roughly $1.7 million is investment growth.
Example 2 — The conservative stress test. The same person sets expected return to 0%. With 35 years of $12,000 contributions on top of the $50,000 starting balance, the nest egg is simply $470,000. That number is the floor: even if markets never deliver a dime of growth, consistent saving still builds a meaningful reserve. The gap between $470,000 and $2.19 million is what a reasonable 7% assumption is worth.
Example 3 — The high-balance professional. A 45-year-old already has $1,200,000 saved, adds $20,000 per year, and assumes a 6% return. Fifteen years later, at 65, the projected nest egg is about $4,584,274. The engine handles balances well above $1 million without issue, so high-net-worth savers can plan with the same tool.
Example 4 — The late starter who works longer. A 40-year-old has $200,000 saved, contributes $18,000 per year at an 8% return, and chooses to retire at 67 rather than 65. Twenty-seven years of growth projects a nest egg near $3,169,926 — proving that a slightly later retirement can more than compensate for a late start.
FAQ
How much money do I need to retire?
A common rule of thumb is the 4% rule: withdraw 4% of your nest egg in your first year of retirement, then adjust for inflation. That means a $1 million nest egg supports roughly $40,000 per year. Multiply your desired annual retirement spending by 25 to estimate your own target, then use this calculator to see whether your current savings and contribution rate get you there.
What is a good expected return to use?
For a long horizon, 7% per year after inflation is a reasonable assumption for a diversified stock-and-bond portfolio, based on US market history. If you are nearing retirement and holding more bonds, use 4–5%. If you want a stress test, drop it to 0% to see your pure savings total with no investment growth at all.
Does employer 401(k) matching count as a contribution?
Yes. A typical employer match is 50–100% of your own contributions up to a percentage of salary, and it lands in your account just like your own money. Include the expected match in the Annual Contribution field — ignoring it is the most common reason people under-project their nest egg.
What happens if I retire earlier, say at 62?
Retiring early shortens both the saving period and the compounding period, and it lengthens the years you will be drawing down the balance. Sliding the Retirement Age from 65 to 62 on this calculator typically reduces the projected nest egg by 15–25% and means three extra years of no contributions — plan for that gap carefully.
Is Social Security included in this number?
No. This calculator projects only the nest egg you build from savings and contributions. Treat the result as your investment-derived income, and add estimated Social Security benefits separately (the Social Security Administration provides a personal estimate on its website) to see your full retirement picture.
Should I use this for my 401(k) or IRA specifically?
The math is identical regardless of account type. Whether your savings sit in a 401(k), a Traditional IRA, a Roth IRA, or a regular taxable brokerage, the future value of contributions and a lump sum compounds the same way. Use this tool to plan the total balance; account-specific tax treatment is a separate conversation with a tax professional.
Disclaimer
This retirement calculator is provided for informational purposes only and does not constitute financial, investment, tax, or retirement-planning advice. Projected values are based on the assumptions you enter, particularly the expected annual return, which is not guaranteed and may differ substantially from actual market performance. Future contributions, tax rules, Social Security benefits, inflation, and life expectancy are all not modeled here. Before making retirement decisions, consult a qualified financial advisor who can review your personal situation, risk tolerance, and employer benefits.