This free retirement calculator projects your nest egg at retirement and estimates the monthly income it could provide, based on your current savings, monthly contributions, expected return, and years until retirement. Use it as a 401k calculator to model employer-plan contributions, as a retirement planner for broad savings goal-setting, or to test how changes in contribution amount or retirement age affect your projected outcome. Results update in seconds β enter your numbers and see the full picture of how your savings could grow.
How This Retirement Calculator Projects Your Nest Egg
The projection uses standard compound interest formula applied monthly:
Nest Egg = Current Savings Γ (1 + r)^n + Monthly Contribution Γ ((1 + r)^n β 1) Γ· r
Where r = annual return Γ· 12 (monthly rate) and n = years until retirement Γ 12 (total months). This separates your outcome into two components shown in the results: total amount you personally contributed versus investment growth generated by compounding. For most long-horizon projections, investment growth substantially exceeds total contributions β visually demonstrating why starting early and staying invested matters more than the specific amount contributed each month.
The monthly income estimate applies the widely-cited 4% rule: annual withdrawal = nest egg Γ 4%, divided by 12 for the monthly figure. As Investopedia’s analysis of the 4% rule explains, this guideline β based on historical market return research β gives a portfolio a high probability of lasting 30 years in retirement, though it is a guideline rather than a guarantee.
401k Calculator β Using Employer Plans to Build Retirement Savings
For most US workers, the 401(k) plan is the primary retirement savings vehicle. As the IRS 401(k) resource guide explains, employees can contribute pre-tax income up to annual limits ($23,000 in 2024; $30,500 for those 50+), with employer matching often adding further contributions. Use this as a 401k calculator by entering your current 401(k) balance as current savings, and your monthly 401(k) contribution (plus employer match if applicable) as the monthly contribution. At a 7% average annual return, contributing $500/month for 35 years from age 30 projects a nest egg of over $950,000 β with investment growth more than doubling total contributions.
Key 401(k) inputs to consider: always contribute at least enough to capture the full employer match β that match is an immediate 50β100% return on your contribution, the highest guaranteed return available in any investment context.
Roth IRA Calculator β Tax-Free Growth for Long-Term Savers
A Roth IRA is the second major retirement vehicle this retirement calculator models. Unlike a 401(k) or traditional IRA, Roth contributions are made with after-tax dollars β but all growth and qualified withdrawals are completely tax-free. For younger savers with decades of compounding ahead, the Roth IRA’s tax-free growth often makes it more valuable than a pre-tax 401(k). The contribution limits for a Roth IRA are $7,000 per year ($8,000 if 50+) for 2024, subject to income limits.
Use this as a roth ira calculator by entering your Roth balance and monthly Roth contributions. Because Roth withdrawals are tax-free in retirement, the projected nest egg represents actual spendable income β unlike a 401(k) where withdrawals are taxed as ordinary income. Many retirement planners recommend holding both account types to create tax diversification in retirement, giving flexibility to draw from whichever minimises your tax bill each year.
Social Security Retirement Calculator β Adding Government Benefits
This retirement calculator models personal savings and investment growth β it does not include Social Security benefits, which add meaningfully to most retirees’ income. The Social Security Administration’s retirement planning resources include a social security retirement calculator that estimates your benefit based on your earnings history. The average Social Security retirement benefit as of 2024 is approximately $1,900/month β a significant supplement to personal savings.
For complete retirement income planning, add your estimated Social Security benefit to the monthly income figure this calculator projects. Use the SSA’s My Social Security account to get your personalised benefit estimate at different claiming ages β claiming at 70 versus 62 can increase monthly benefits by up to 75%, making the claiming-age decision one of the most impactful in all of retirement planning.
How Much Do You Need to Retire? Retirement Planner Benchmarks
The most common retirement planning benchmark is 25Γ your expected annual spending β the mathematical inverse of the 4% rule. If you plan to spend $60,000 per year in retirement, you need approximately $1,500,000. As the US Department of Labor’s retirement guidance notes, most financial planners recommend replacing 70β80% of pre-retirement income to maintain a similar lifestyle. Age-based savings benchmarks from major institutions suggest:
- By age 30 β 1Γ your annual salary saved
- By age 40 β 3Γ your annual salary saved
- By age 50 β 6Γ your annual salary saved
- By age 60 β 8Γ your annual salary saved
- By retirement (65) β 10Γ your annual salary saved
Use this retirement calculator to see whether your current trajectory reaches these benchmarks β and how much your monthly contribution needs to increase to close any gap. For inflation-adjusted planning, use our inflation calculator to understand what your projected nest egg will be worth in real terms, our compound interest calculator to model specific investment scenarios, and our savings goal calculator to set structured monthly contribution targets. Browse all tools at our free tools hub.
Frequently Asked Questions
The nerdwallet retirement calculator, aarp retirement calculator, ramsey retirement calculator, and vanguard retirement income calculator all use the same compound interest formula for projecting savings growth β as does this tool. The primary differences are interface features and additional inputs. This retirement calculator shows the split between personal contributions and investment growth, applies the 4% rule for income estimation, and is fully browser-based with no data storage. The underlying mathematics are identical for the same inputs.
Long-term diversified US equity index funds have historically delivered approximately 7β10% annualised returns before inflation. For conservative planning, 6β7% is a reasonable assumption that accounts for portfolio diversification and some drag from bonds. For an inflation-adjusted “real return” projection, subtract your assumed inflation rate (typically 2β3%) from the nominal return. The 4% rule and standard benchmarks assume nominal returns β if you want your result in today’s purchasing power, use a real return of 4β5% instead of 7%.
The 4% rule states that withdrawing 4% of your retirement savings in the first year, then adjusting annually for inflation, gives a portfolio a high historical probability of lasting 30 years. It originated from research by financial planner William Bengen using historical US market data. It is a useful planning guideline β not a guarantee. Market conditions, your actual spending, and how long you live all affect real outcomes. Many retirees use a slightly more conservative 3β3.5% withdrawal rate to add a larger margin of safety, particularly for early retirees who may need savings to last 40+ years.
Starting late reduces compounding time but does not make meaningful retirement savings impossible. The most effective levers for late starters: increase monthly contributions as much as your budget allows, take full advantage of catch-up contribution limits (401(k): +$7,500/year after 50; IRA: +$1,000/year after 50), consider delaying retirement by 2β5 years (which adds both accumulation time and reduces the withdrawal period), and delay Social Security claiming to increase monthly benefits. Use this retirement calculator to test different retirement ages and contribution scenarios β even a 2-year delay in retirement often produces a dramatically better outcome than increasing contributions alone.
Yes β completely free with no sign-up, no account, and no usage limits. All calculations run in your browser and nothing you enter is stored or transmitted anywhere. Use it to model as many retirement scenarios as you need β different contribution levels, retirement ages, and return assumptions β to build a clear picture of your retirement planning options.