Retirement Calculator – Project Your Retirement Savings

Your Retirement Details

Current Age

yrs

Retirement Age

yrs

Current Savings

Monthly Contribution

Annual Return Rate

Annual Withdrawal Rate

Results

Enter your details and hit Calculate

What is a Retirement Calculator?

A retirement calculator helps you project how much money you will have saved by the time you retire, and how much monthly income that savings can realistically support. By combining your current savings, ongoing contributions, expected investment returns, and time horizon, it applies compound growth mathematics to give you a clear picture of where you are headed financially.

The calculator also uses a withdrawal rate — the percentage of your retirement portfolio you draw down each year — to estimate your monthly income in retirement. The widely-cited 4% rule suggests that withdrawing 4% of your portfolio in the first year of retirement (adjusted for inflation annually) gives a high probability of your savings lasting 30 years or more.

Retirement planning is time-sensitive: the earlier you start, the more compound growth works in your favor. Even small differences in how early you begin — or how much you contribute each month — can translate into hundreds of thousands of dollars by retirement age.

Retirement Savings Formula Explained

The calculator uses two components to project your retirement balance: the future value of your existing savings and the future value of your ongoing monthly contributions, both compounded at your expected annual return.

FV = P(1 + r)ⁿ + C × (1 + r)ⁿ − 1r

FV — Future value: your projected retirement nest egg.
P — Present value: your current savings balance.
C — Annual contribution: monthly contribution × 12.
r — Annual return rate (e.g. 7% entered as 0.07).
n — Years until retirement: retirement age minus current age.

Monthly income in retirement is calculated from your nest egg and your chosen withdrawal rate. At a 4% annual withdrawal rate, your monthly income is simply: Nest Egg × 0.04 ÷ 12. This figure represents sustainable income that, according to historical research, has a high probability of lasting 30+ years when invested in a balanced portfolio.

Your actual returns will vary based on your asset allocation, market conditions, and fees. The return rates used in this calculator are nominal (before inflation). Adjusting for 2–3% average inflation gives a more conservative view of your purchasing power in retirement.

Example: Starting at Age 30

Suppose you are 30 years old, plan to retire at 65, have $25,000 in current savings, and are contributing $500/month. Here is how different return rates affect your outcome:

Annual Return	Nest Egg at 65	Monthly Income (4%)	Total Contributed
4%	$557,396	$1,858	$235,000
6%	$923,550	$3,078	$235,000
7%	$1,280,543	$4,268	$235,000
10%	$3,043,982	$10,147	$235,000

The highlighted row uses a 7% annual return — often cited as a reasonable long-term estimate for a diversified stock portfolio (before inflation). Notice that the same $235,000 in total contributions produces vastly different outcomes depending on return rate. At 7%, the $235,000 contributed grows to over $1.28 million — more than five times the amount invested — demonstrating the extraordinary power of long-term compound growth.

Starting savings: $25,000. Monthly contribution: $500. Retirement age: 65. Current age: 30. Withdrawal rate: 4%. Figures are nominal (not inflation-adjusted). For illustrative purposes only.

Frequently Asked Questions

How much do I need to retire?

A common starting point is the "25x rule": multiply your expected annual retirement expenses by 25 to get a target nest egg. This is derived from the 4% withdrawal rule — if you withdraw 4% of your savings each year, you need 25x your annual expenses saved. For example, if you expect to spend $60,000 per year in retirement, your target is $1,500,000. This rule is a guideline, not a guarantee. Your actual target depends on your retirement age, lifestyle, Social Security benefits, healthcare costs, and the length of your retirement. Retiring early (before 65) or expecting a 30+ year retirement may require a larger nest egg or lower withdrawal rate.

What is the 4% rule?

The 4% rule is a retirement income guideline developed from the "Trinity Study," which analyzed historical portfolio returns across various stock and bond allocations. It suggests that retirees can withdraw 4% of their portfolio in the first year of retirement, then adjust that amount for inflation each year, with a high probability (historically ~95%) that the portfolio lasts at least 30 years. The rule assumes a diversified portfolio of roughly 50–75% stocks and 25–50% bonds. In a low-return environment, or for retirements longer than 30 years, a more conservative withdrawal rate of 3–3.5% is often recommended.

What annual return should I use in retirement projections?

The U.S. stock market (S&P 500) has historically returned approximately 10% per year on average in nominal terms, or roughly 7% after inflation. A balanced portfolio of stocks and bonds typically returns 6–8% nominally. For conservative projections, many financial planners use 5–6%. For aggressive, stock-heavy portfolios, 8–10% is sometimes used. The most important thing is to run scenarios with different return rates so you understand the range of outcomes. Also remember that investment fees (expense ratios) reduce your actual return, so subtract 0.1–1% from your expected return depending on your fund choices.

How does starting early affect retirement savings?

Starting early is the single most powerful factor in retirement savings, due to compound growth. Consider two investors both contributing $500/month at 7% annual return: the first starts at age 25 and stops at 65 (40 years), accumulating approximately $1.3 million from $240,000 in contributions. The second starts at 35 and stops at 65 (30 years), accumulating approximately $567,000 from $180,000 in contributions. The 10-year head start more than doubles the final balance, even though the first investor only contributed $60,000 more. Time in the market is irreplaceable — starting even a few years earlier can mean hundreds of thousands of dollars in additional savings.

Should I include Social Security in my retirement plan?

Yes — Social Security can be a meaningful supplement to personal savings, but it should generally not be your primary retirement income source. As of 2024, the average monthly Social Security benefit is approximately $1,900 for retired workers. Your personal benefit depends on your earnings history and the age at which you claim (claiming at 62 permanently reduces benefits; claiming at 70 maximizes them). To estimate your Social Security benefit, visit the Social Security Administration's website at ssa.gov. When planning your retirement, use this calculator to determine how much personal savings you need to cover the gap between your Social Security income and your total expected expenses.