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Retirement & 401k Calculator — Project Your Savings

See how much your retirement savings could grow by the time you retire. Enter your current balance, monthly contribution, employer match, expected annual return, and the years until retirement, and this calculator projects your future 401k balance — itemizing how much comes from your own contributions, your employer’s match, and compound investment growth.

Your numbers

$

What your retirement accounts are worth today.

$

How much you add each month, from your paycheck.

%

Long-run average, e.g. 6–8% for a stock-heavy mix.

yr

Years your money has left to grow.

%

Percent of your contribution the employer adds (0 if none).

$

Most the employer will match each month.

Results

Projected balance at retirement$1,117,890.68

Where it comes from

Starting balance$25,000.00
Your contributions$180,000.00
Employer match$90,000.00
Investment growth$822,890.68

Employer match adds $250.00 per month. This projection assumes a constant annual return; real markets rise and fall, so your actual balance will differ. Educational estimate only — not financial advice.

“How much will my 401k be worth?” comes down to four numbers: what you have saved now, how much you add each month, what your employer matches, and the average return your investments earn over the years until you retire. This calculator compounds all of those monthly — the same rhythm your contributions arrive on — and then itemizes the result, so you can see exactly how much of your future balance is your own money, your employer’s match, and compound growth.

What the projection adds up

Your projected balance is the sum of three growing pieces:

  • Your starting balance grows as a lump sum, compounding every month at your expected return.
  • Your monthly contributions are added at the end of each month and compound from there — the standard “future value of an annuity.”
  • Your employer’s match is treated as an extra monthly contribution (a percentage of what you put in, up to a monthly cap) that compounds right alongside your own.

We compound monthly because your contributions are monthly: the periodic rate is your annual return ÷ 12, applied over the number of months until retirement. Compounding annually instead would understate the result by tens of thousands of dollars over a career — it is the classic silent error in retirement math, so this tool pins the monthly convention.

A worked example

The calculator opens with a typical mid-career saver. Here’s how the pieces add up over 30 years at a 7% average return:

  • Starting balance: $25,000 today
  • Your contributions: $500/month × 360 months = $180,000 put in
  • Employer match: 50% of your contribution, capped at $250/month = $90,000 matched
  • Investment growth: the compound earnings on all of the above = ≈ $822,891
  • Projected balance at retirement: ≈ $1,117,891

The four pieces reconcile exactly: $25,000 + $180,000 + $90,000 + $822,891 = $1,117,891. Notice that growth — roughly $823,000 — dwarfs the $270,000 you and your employer actually deposited. That gap is the power of compounding over decades, and it is why starting early and capturing the full employer match matter so much. Change any input and the breakdown updates live.

A note on the return assumption

A common planning assumption for a stock-heavy portfolio is 6%–8% per year on average over the long run. The point to remember: this projection assumes a constant rate every year, and real markets never behave that smoothly — they rise and fall, sometimes sharply, and a bad sequence of returns near retirement can change the outcome. Treat the number as a planning estimate, not a promise, and revisit it as your balance and contributions change.

Important: this is an estimate, not advice

This calculator is an educational tool. It ignores inflation, taxes, fees, and the year-to-year variability of real returns, and it cannot account for your full financial picture — other accounts, Social Security, your risk tolerance, or your goals. It is not financial advice. Before making retirement decisions, consult a qualified financial advisor who can model your specific situation.

Estimates are for planning and education only. See our disclaimer.

Frequently asked questions

How much will my 401k be worth at retirement?
It depends on four things: your current balance, how much you contribute each month, any employer match, and your average annual return over the years until you retire. This calculator compounds all of those monthly to project a balance. For example, $25,000 today plus $500 a month, a 50% employer match (up to $250/mo), and a 7% return over 30 years grows to about $1,117,891 — of which roughly $823,000 is investment growth.
How does an employer 401k match grow my savings?
An employer match is free money added to your account: a common formula is 50% of what you contribute, up to a limit (for example, 50% up to $250 a month). That matched amount is invested alongside your own contributions and compounds the same way, so over a career it can add hundreds of thousands of dollars. This tool models the match as an extra monthly contribution and shows the total match separately so you can see its impact.
How is compound growth calculated in this projection?
We compound monthly, because your contributions are monthly: the periodic rate is your annual return divided by 12, applied over the number of months until retirement. Your starting balance grows as a lump sum, and each monthly contribution (yours plus the employer match) is added at the end of its month and compounds from there — the standard future-value-of-an-annuity method. Compounding monthly rather than annually matters; over decades it changes the result by tens of thousands of dollars.
What annual return should I assume for retirement?
A common planning assumption for a stock-heavy portfolio is about 6%–8% per year on average over the long run, before inflation. The historical long-run return of the US stock market is roughly 10% nominal, but most planners use a more conservative figure to leave a margin of safety and account for fees and bonds. Remember this is an average — real returns vary year to year, and this projection assumes a constant rate, which the market never delivers smoothly.
Can I retire by 65 with my current savings rate?
Enter the number of years between now and 65 as your time horizon, along with your current balance and monthly contribution, to see the projected balance at 65. Then compare it to your retirement income goal — a common rule of thumb is the "4% rule," where you can withdraw about 4% of your balance per year. If the projection falls short, the biggest levers are contributing more, capturing the full employer match, and giving your money more years to compound.

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