Retirement Savings Calculator
See what your savings could actually grow into by the time you retire, and whether your monthly contribution is enough to support the lifestyle you want. No guesswork, just real numbers based on how compound growth works.
Where the balance comes from
How the balance grows over time
What this means
Fill in the calculator above and click calculate to see your results explained here.
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Your personalized next step will appear here once you calculate.
What a retirement savings calculator actually shows you
Think of your retirement account like a garden. Every month you plant a small seed, that is your contribution. Over many years, those seeds do not just sit there. They grow, and the growth itself starts producing more growth. That second part is called compounding, and it is the real engine behind almost every retirement plan.
This calculator takes what you already have saved, adds your future monthly contributions, and grows the whole thing at the return rate you choose. It then shows you two versions of that final number. One is the raw dollar amount you will actually see in the account. The other is what that same amount can really buy once you account for rising prices between now and then.
The formula behind the numbers
This is the standard compound interest formula used by banks and financial planners. The calculator applies it monthly, since most people contribute monthly.
A real life worked example
Say Sarah is 30 years old today. She already has $10,000 saved, and she adds $300 every month. She expects her investments to grow at 7% a year, and expects inflation to run at 3% a year. She plans to retire at 65, which gives her 35 years to grow her savings.
By age 65, her account would hold roughly $655,000. That sounds like a lot, but prices will also have risen a lot over 35 years. In today’s purchasing power, that balance is really worth closer to $233,000. Using the 4% withdrawal rule, that supports about $776 a month in today’s spending power, on top of anything like a pension or social security.
Notice something important here. Sarah only contributed $136,000 of her own money over 35 years. The rest, over half a million dollars, came from growth alone. That is the entire point of starting early.
Why starting early matters more than the amount
Imagine two friends, both aiming to retire at 65. One starts saving $300 a month at age 25. The other waits and starts saving the same $300 a month at age 35. That ten year head start, at a 7% return, can leave the early starter with roughly double the final balance of the late starter, even though both put in the same monthly amount for the years they were saving. Time in the market does more work than most people expect.
What the 4% rule actually means
The 4% rule is a simple guideline used by financial planners to estimate how much you can safely withdraw from savings each year in retirement, without running out of money too soon. It comes from historical research on how long a diversified portfolio can support withdrawals through both good and bad market years. Withdrawing your balance times 4% per year, split into monthly amounts, is what this calculator uses to estimate your sustainable monthly income. It is a starting guideline, not a guarantee, since actual market returns vary year to year.
Frequently asked questions
A common guideline is to save at least 15% of your income for retirement, including any employer match. The right number for you depends on your current age, your desired lifestyle, and how many years you have left before retiring. Use this calculator with a few different monthly amounts to see how each one changes your outcome.
The first number is the actual dollar figure your account will likely show on the day you retire. The second number adjusts that figure for inflation, showing what it can really buy in today’s terms. Both numbers are correct, they just answer different questions.
Many planners use 6% to 8% for a diversified stock heavy portfolio held over decades, though actual returns vary year to year. A more cautious plan might use 5%. Try a few different rates here to see how sensitive your results are to this assumption.
No, this calculator only projects your personal savings and contributions. Social security, a workplace pension, or other guaranteed income should be added on top of the monthly income figure shown here to get your full retirement picture.
Yes, and often more than people expect. Because of compounding, contributions made earlier have more years to grow than contributions made later. Increasing your monthly amount even a few years earlier can noticeably raise your final balance. Try changing the monthly contribution field here to see the effect for yourself.