Retirement Calculator
Use this free retirement calculator to project how much your savings could grow by the time you retire. Enter your current age, retirement age, current savings, monthly contribution, and expected annual return to see your projected nest egg, an estimated retirement income, and a full year-by-year growth schedule. Add an annual contribution increase to see how raising your savings rate over time accelerates your results.
What Is a Retirement Calculator?
A retirement calculator projects how your retirement savings will grow over time based on your current balance, ongoing contributions, and an assumed rate of investment return. It answers two of the most important retirement planning questions: how large will my nest egg be by the time I retire, and how much income could that nest egg sustainably provide once I stop working. This calculator also produces a full year-by-year growth schedule so you can see exactly how contributions and compounding build your balance over your career.
How Retirement Savings Growth Is Calculated
Retirement savings grow through compound interest: each year's investment returns are added to the balance, and next year's returns are calculated on that larger amount, not just your original contributions. Combined with regular monthly contributions, this creates the future value of a growing annuity:
FV = P(1+r)n + PMT × [((1+r)n − 1) ÷ r]
Where FV is your projected balance, P is your current savings, r is your periodic (monthly) rate of return, n is the number of periods until retirement, and PMT is your periodic contribution. The longer your time horizon, the more of your final balance comes from growth rather than contributions — which is why starting early has an outsized impact.
Estimating Your Retirement Income: The 4% Rule
A widely used guideline for turning savings into income is the 4% rule: withdraw about 4% of your portfolio in your first year of retirement, then adjust that dollar amount for inflation each year after, on the theory that a diversified portfolio can sustain roughly 30 years of withdrawals. Multiplying your desired annual income by 25 gives you an equivalent "number to hit" — for example, $50,000 a year in retirement income implies a target of roughly $1,250,000. Adjust the withdrawal rate field above if you want a more conservative or more aggressive assumption.
How Much Should You Contribute Each Month?
A commonly cited target is to save 10-15% of pre-tax income for retirement, ideally starting in your 20s or 30s. If you're starting later, a higher contribution rate — or a later retirement age — can help close the gap. Many employer 401(k) plans also offer a matching contribution up to a certain percentage; contributing at least enough to capture the full match is effectively an immediate, guaranteed return before any market growth is considered.
401(k) vs. IRA vs. Taxable Brokerage Accounts
| Account Type | Tax Treatment | Typical Contribution Limit | Best For |
|---|---|---|---|
| 401(k) / 403(b) | Pre-tax (or Roth) growth, employer-sponsored | Highest of the three | Capturing an employer match first |
| Traditional / Roth IRA | Pre-tax or tax-free growth, opened independently | Lower than a 401(k) | Additional tax-advantaged saving with more investment choice |
| Taxable brokerage account | No special tax advantage | Unlimited | Extra saving beyond tax-advantaged limits |
The Impact of Starting Early
Because compounding is exponential, a saver who starts a decade earlier — even with smaller contributions — often ends up with a larger balance than someone who starts later with bigger contributions. Every year you delay is a year of growth on that contribution that can never be recovered. Use the current age and retirement age fields above to see how much a shorter or longer time horizon changes your projected balance.
Why an Annual Contribution Increase Matters
Few people can max out retirement contributions from day one, but committing to raise your contribution rate by even 1-2% each year — often timed with an annual raise — compounds significantly over a multi-decade career. This calculator's "Annual Contribution Increase" field models that strategy, sometimes called a savings rate escalator, so you can see its long-term effect without changing your take-home pay today.
Rate of Return Assumptions
Long-term retirement projections commonly use an average annual return between 5% and 8% for a diversified portfolio of stocks and bonds, though actual returns vary year to year and depend heavily on your asset allocation, time horizon, and fees. A more stock-heavy portfolio has historically produced higher average returns with more short-term volatility, while a more bond-heavy portfolio is steadier but grows more slowly. Model a conservative and an optimistic scenario by adjusting the expected return field above.
Tips to Boost Your Retirement Savings
- Contribute enough to capture your full employer 401(k) match before investing elsewhere.
- Automate an annual contribution increase so your savings rate rises without requiring a fresh decision each year.
- Keep investment fees low — high expense ratios compound against you the same way returns compound for you.
- Avoid early withdrawals, which forfeit years of compounding and often trigger taxes and penalties.
- Revisit your plan every few years and adjust your contribution or retirement age if you're off track.
Common Mistakes in Retirement Planning
- Underestimating how long retirement will last. Many retirees underspend their planning horizon by assuming a shorter retirement than they actually experience.
- Ignoring inflation. A dollar in 30 years won't buy what it does today — build a margin of safety into your income target.
- Not accounting for taxes on withdrawals. Traditional 401(k) and IRA withdrawals are generally taxed as income, which affects how much spendable income your balance provides.
- Stopping contributions during market downturns. Pausing contributions when prices are low means missing out on shares purchased at a discount.
- Forgetting Social Security or pensions. This calculator projects income from personal savings only — add other expected income sources separately when budgeting for retirement.
Frequently Asked Questions
Q: How much money do I need to retire?
A: A common guideline is the 4% rule: multiply your desired annual retirement income by 25 to estimate the nest egg needed. For example, $40,000 a year in retirement income suggests a target of about $1,000,000 in savings.
Q: How is retirement savings growth calculated?
A: Retirement savings growth is calculated by compounding your current balance and each new contribution at your expected rate of return, month over month, until your target retirement age, using the standard future value of an annuity formula.
Q: What is the 4% withdrawal rule?
A: The 4% rule suggests withdrawing 4% of your retirement portfolio in the first year of retirement, then adjusting that amount for inflation each year after, as a way to make savings last approximately 30 years.
Q: How much should I contribute to retirement each month?
A: A common guideline is to save 10-15% of pre-tax income for retirement starting in your 20s or 30s, though the right amount depends on your target retirement age, expected return, and desired retirement income.
Q: What rate of return should I assume for retirement planning?
A: Many long-term retirement projections use an average annual return between 5% and 8% for a diversified stock-and-bond portfolio, though actual returns vary by asset allocation, fees, and market conditions.
Q: Does increasing my contribution each year make a big difference?
A: Yes. Increasing your contribution rate annually, even by 1-2%, compounds significantly over a multi-decade career and can substantially increase your final retirement balance compared to a flat contribution.
Q: Should I include Social Security in my retirement calculation?
A: This calculator estimates income from your personal savings only. Social Security, pensions, or other income sources should be added separately when determining your total expected retirement income.
Q: What is the difference between a 401(k) and an IRA for retirement savings?
A: A 401(k) is an employer-sponsored plan, often with a company match, and higher annual contribution limits. An IRA is opened independently with more investment choice but generally lower contribution limits. Both grow tax-advantaged and can be modeled with this calculator.
This calculator provides estimates for informational purposes only and does not constitute financial or investment advice. Actual returns, contribution limits, taxes, and inflation vary. Consult a licensed financial professional for guidance specific to your situation.