Formulas and 2026 figures checked & updated: July 2026
Annual: $9,600/year
Historical S&P 500 avg: ~10% nominal, ~7% real (inflation-adjusted)
4% is the traditional 'safe withdrawal rate'. 3.5% is more conservative.
Savings Growth Projection
How to Use the Retirement Savings Calculator
- Enter your current age and target retirement age.
- Enter your current retirement savings balance.
- Enter your monthly contribution amount.
- Set your expected annual rate of return (6–7% is a common long-run planning assumption).
- Set a planned withdrawal rate for your retirement income (4% is the traditional safe withdrawal rate).
- Review your projected nest egg, total contributions, and investment growth.
- Example: $100,000 saved plus $800/month for 25 years at 7% grows to about $1.1M, supporting roughly $48,000/year at a 4% withdrawal rate.
What This Calculator Does
The Retirement Savings Calculator projects how your current nest egg and ongoing monthly contributions will grow by the time you retire. It combines your existing balance, your savings rate, your current age and target retirement age, and an expected annual return into a single future value — then estimates the monthly income that balance could support.
The projection is driven by six inputs: your current age, target retirement age, current savings balance, monthly contribution, expected annual rate of return, and planned withdrawal rate in retirement. A widely cited guideline is to save 10–15% of your income for retirement and to target a nest egg of roughly 25 times your annual expenses, based on a 4% safe withdrawal rate — so someone who expects to spend $60,000 a year would aim for about $1.5 million. For the return assumption, many planners use 6–7% for a nominal, long-run diversified stock-heavy portfolio, since the S&P 500's historical average nominal return runs close to 10% before inflation.
This calculator is useful any time you want to check whether your current savings trajectory is on pace to meet a retirement income goal, or to test 'what if' scenarios such as increasing your monthly contribution by $100, retiring two years later, or assuming a more conservative return. Small changes made today compound into large differences decades from now, and this tool makes those differences visible instantly — especially useful when deciding how to prioritize retirement savings against other financial goals.
Formula
FV = PV(1+r)^n + PMT × [((1+r)^n − 1) / r]Future value (FV) is the sum of two pieces: your current savings growing on their own, plus a stream of monthly contributions growing as an annuity. Both pieces compound at the same assumed rate of return.
- PVPresent value — your current retirement savings balance
- PMTMonthly contribution amount
- rMonthly rate of return (annual return ÷ 12)
- nTotal number of months until retirement
Examples
Example 1: Starting at 32 with $45,000 saved
A 32-year-old with $45,000 saved, contributing $800/month, retiring at 65 (33 years), assuming a 7% annual return.
Projected nest egg ≈ $1,480,000 — supporting roughly $4,930/month in retirement income at a 4% withdrawal rate.
Example 2: Late starter at 45
A 45-year-old with $80,000 saved, contributing $1,200/month, retiring at 67 (22 years), at a 7% return.
Projected nest egg ≈ $920,000 — about $3,070/month at a 4% withdrawal rate, illustrating why starting later requires higher contributions to catch up.
Example 3: The cost of waiting 10 years
Compare a 25-year-old vs. a 35-year-old, both contributing $500/month at 7% until age 65 (40 vs. 30 years).
The 25-year-old ends with roughly $1,200,000, while the 35-year-old ends with roughly $590,000 — about half — purely from losing 10 years of compounding.
Key Terms Explained
- Compound Interest
- Interest earned on both your original balance and previously earned interest, so growth accelerates the longer money stays invested.
- Safe Withdrawal Rate
- The share of a portfolio you can withdraw each year with low risk of running out — traditionally around 4% (the “4% rule”).
- Real Return
- An investment's return after subtracting inflation — what your money actually gains in purchasing power.
- Inflation
- The gradual rise in prices that erodes purchasing power, so a dollar buys less over time.
- Employer Match
- Money your employer adds to your 401(k) based on your own contributions — effectively free retirement savings, up to a limit.
Continue Your Financial Planning
Methodology
Future value: FV = PV·(1+r)^n + PMT·[(1+r)^n − 1]/r. Monthly contributions modeled as ordinary annuity. Withdrawal uses specified percentage of accumulated balance at retirement.
Frequently Asked Questions
How much do I need to retire?+
A common target is 25× your expected annual expenses (derived from the 4% withdrawal rule). If you expect to spend $60,000/year in retirement, you'd need $1.5M. This calculator projects whether your current savings trajectory reaches that goal.
What is the 4% withdrawal rule?+
Research by William Bengen (1994) and the 'Trinity Study' found that a diversified portfolio could sustain 4% annual withdrawals (inflation-adjusted) over 30 years with high historical reliability. Some planners now recommend 3.5% given lower expected returns.
Should I use a Roth or traditional retirement account?+
Traditional accounts (401k, IRA) reduce taxable income now but withdrawals are taxed. Roth accounts use after-tax money but grow and withdraw tax-free. General guidance: traditional if you expect to be in a lower tax bracket in retirement; Roth if you expect higher brackets or want tax diversification.
How much should I have saved for retirement by age 40?+
A commonly cited industry benchmark suggests aiming for roughly 1x your annual salary saved by age 30, 3x by age 40, 6x by age 50, and about 10x by a traditional retirement age around 67. These are rough guideposts assuming steady saving and market-average returns, not hard targets — your actual number depends on your desired retirement lifestyle, expected Social Security income, and planned retirement age.
Does this calculator account for Social Security or inflation?+
No — this calculator projects only the growth of your personal savings and contributions; it doesn't add Social Security income or subtract for inflation. For a more conservative, inflation-adjusted picture, enter a 'real' return (typically 2-3 percentage points below the nominal return you'd otherwise use), and add any expected Social Security benefit separately when deciding whether your total retirement income meets your goal.
What if I'm behind on retirement savings — can I still catch up?+
Yes. Increasing your monthly contribution, working a few extra years, or maximizing catch-up contributions available at age 50 in 401(k)s and IRAs can meaningfully close the gap, since more years of compounding and larger contributions both accelerate growth. Even modest increases — for example, adding $200/month — can add well over $100,000 to a balance by retirement age if invested for 15-20+ years at a typical long-run return.
Can I save my results?+
Yes. Use “Save results” to store a snapshot. Without an account it remains in this browser. If you log in, saved scenarios sync securely to your SmartRates account so they are available on your other devices.
How do I share my calculation?+
Click “Share” in the toolbar to copy a link (or open your device’s share sheet). The link encodes your exact inputs, so whoever opens it sees the calculator pre-filled with the same numbers and the same result.
Can I email my calculator results?+
Yes. Click “Email results” to open your default email application with the current inputs, results, and calculator link already included. Review the message and choose the recipient before sending.
Can I export or print my results as a PDF?+
Yes. Click “Export PDF” to open a clean, printable summary of your inputs and results that you can save as a PDF or print. It includes a timestamp and a link back to the calculator.
How accurate are the calculator results?+
The arithmetic follows the formula and assumptions documented on this page. The result is still an estimate because actual rates, fees, taxes, timing conventions, eligibility rules, and provider calculations can differ. Use figures from your official quote, statement, contract, or tax form before making a financial decision.
Which inputs have the biggest effect on the result?+
Rate, time, starting balance, recurring payments or contributions, and fees usually have the largest effects. Change one input at a time to create a conservative, expected, and optimistic scenario instead of relying on a single forecast.
Are taxes, fees, and inflation included?+
Only when they appear as an input or are explicitly described in the methodology. Do not assume an omitted cost is zero. Review the formula and methodology sections to see exactly what is included before comparing the result with an outside quote.
Can this calculator predict future rates or returns?+
No. A calculator projects the assumptions entered; it cannot predict market returns, inflation, variable interest rates, tax-law changes, or provider decisions. Rerun the calculation with several assumptions to understand the range of possible outcomes.
Why might my lender, bank, broker, or tax software show a different result?+
Professional systems may use daily timing, transaction dates, compounding conventions, rounding rules, account-specific fees, credits, eligibility details, or regulations that a general-purpose calculator cannot know. A small difference can be rounding; a large difference usually means an assumption or included cost is different.
Disclaimer: Calculations are for informational purposes only and do not constitute professional financial advice. Please consult with a certified professional before making financial decisions.