savings

401k Calculator | Project balance with contributions & match

Projects how much your 401(k) retirement account will grow. Enter your current balance, annual contribution, employer match percentage, expected annual return, and years until retirement, and the tool estimates your future balance, the total you will have contributed, and how much of the final amount comes from investment growth and employer matching.

Last updated: June 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

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Quick reference

2026 IRS 401(k) contribution limits:

Limit	Amount
Employee deferral (under 50)	$24,500
Catch-up (age 50+)	+$8,000
Catch-up (age 60–63)	+$11,250
Total employee + employer	$72,000

savings Plan with confidence

Finance decisions get a lot easier when you can see the full picture. Enter your numbers above to see total payments, interest paid, and the long-term cost of every choice — so you can compare options side by side before signing anything.

percent How the math works

We use the standard amortization, compound-interest and present-value formulas published by the Consumer Financial Protection Bureau and the Federal Reserve. The methodology block below shows every variable and rounding step we apply, so the answer is never a black box.

shield_lock Your data stays private

Every calculation happens in your browser with JavaScript — your income, balances, and loan numbers are never sent to our servers, logged, or shared. Close the tab and the inputs vanish. No sign-up, no tracking pixels on the form, no spreadsheet emailed to you later.

lightbulb Pro tip

Save the URL after you calculate — your inputs aren't stored, so write down the headline number plus the breakdown. Then come back and edit one variable at a time (down payment, rate, term) to see exactly which lever moves your monthly figure the most. That's where the real planning happens.

Interpretation guide

Levers that grow your 401(k):

Lever	Why it matters
Employer match	Free money — always contribute enough to get the full match
Start early	Decades of compounding beat a larger late contribution
Contribution rate	Each 1% adds up substantially over a career
Fees & allocation	Lower fees and a growth mix raise the long-run balance

lightbulb Worked example

Let's say you are using the 401(k) Calculator. Projects how much your 401(k) retirement account will grow. Enter your current balance, annual contribution, employer match percentage, expected annual return, and years until retirement,. Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula FV = PMT x (((1 + r)^n - 1) / r), with PMT = annual contribution + match and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

Formula: FV = PMT x (((1 + r)^n - 1) / r), with PMT = annual contribution + match

The 401(k) Calculator is built on a well-established calculation method. It uses the formula FV = PMT x (((1 + r)^n - 1) / r), with PMT = annual contribution + match to turn your inputs into a reliable result. Projects how much your 401(k) retirement account will grow. Enter your current balance, annual contribution, employer match percentage, expected annual return, and years until retirement, and the tool estimates your The steps are shown on the page so you can follow the reasoning from input to output.

The projection compounds your annual contributions plus any employer match at an assumed return, year by year, to retirement age. Because gains are reinvested, the balance grows exponentially — money added in your 20s does far more work than money added in your 50s. Always capture the full employer match first; it's an immediate return no investment can match.

What is the 401(k) Calculator?

The 401(k) Calculator is a free, browser-based finance calculator tool that helps you Projects how much your 401(k) retirement account will grow. Enter your current balance, annual contribution, employer match percentage, expected annual return, . Instead of working through the math by hand or in a spreadsheet, you enter your values and the calculator returns an accurate result instantly — while still showing the formula and the steps so you can verify the reasoning. It is designed for quick everyday use: no sign-up, no installation, and everything runs locally in your browser for complete privacy.

How to use the 401(k) Calculator

Enter the required values into the input fields.
Press the calculate button — the result appears immediately, updated live as you change any value.
Read the step-by-step breakdown below the result to see exactly how the calculation was performed.
Use the interpretation guide to understand what the result means for your situation, and try different inputs to see how they change the outcome.

How to use the 401(k) Calculator

Enter your current 401(k) balance, your annual contribution, your employer match percentage (and match cap), your expected annual return, and the years until retirement. The tool grows the account with FV = PMT × (((1 + r)^n − 1) ÷ r), where PMT is your annual contribution plus the employer match, r the return, and n the years. The result separates your contributions and employer match from the investment growth, showing how much the compounding did for you.

Interpreting your result

The employer match is free money that compounds for decades — a 50% match on your 6% contribution effectively adds 3% of salary to your annual savings at zero cost to you, which is why the 'contribute at least to the match' advice exists. The breakdown line between contributions and growth tells the story: over 30 years at 7%, the growth usually exceeds everything you put in. The tool is also the planning engine for retirement: the projected balance divided by your planned annual withdrawal (using the 4% rule) shows how much retirement income the account supports.

Common mistakes to avoid

The most common error is leaving match money on the table by contributing below the match threshold. Second, ignoring the contribution limit — amounts above the IRS cap cannot be contributed pre-tax. Third, cashing out or borrowing early, which breaks the compounding and triggers taxes and penalties. Finally, using a fixed high return without stress-testing — plan at 6–7% and review annually. Remember that traditional 401(k) withdrawals are taxed as ordinary income, so the projected balance is pre-tax.

Tips for best results

Contribute at least enough to capture the full employer match — it is the highest guaranteed return you will ever get. Increase your contribution by 1% with every raise until you reach your target. Use the calculator to model the match and limit accurately, then automate the contribution. If your plan offers a Roth option, consider splitting contributions based on your tax outlook. Review the asset allocation as you approach retirement — the projection assumes the return holds, but de-risking changes the numbers.

Authoritative source: U.S. Department of Labor

Frequently asked questions

How much should I contribute to my 401(k)?

The 401(k) Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Projects how much your 401(k) retirement account will grow. Enter your current balance, annual contribution, employer match percentage, expected annual return, and years until retirement, and the tool estimates your future balance, the total you will have There is no limit on usage, and it works on any device.

What is the 2026 401(k) contribution limit?

The 2026 employee elective deferral limit is $24,000, with a $7,500 catch-up for those 50 and older (limits are adjusted annually for inflation). The employer match does not count toward the employee limit but does count toward the combined $70,000 total limit. The calculator uses the employee limit to cap the contribution input for accurate projections.

How does employer matching work?

Enter the required values into the input fields and press the calculate button. The tool applies the formula FV = PMT x (((1 + r)^n - 1) / r), with PMT = annual contribution + match and returns the result with a short explanation of each step, so you can check the working yourself.

What return should I assume?

Plan with a conservative long-run return: 5–6% nominal for a balanced portfolio is a reasonable planning assumption, and 7–8% is optimistic but historically defensible for stock-heavy portfolios. The calculator lets you stress-test — the difference between 5% and 7% over 30 years is roughly a third of the final balance. Choose a number you can live with if it underperforms.

Is a 401(k) better than an IRA?

Each has advantages. A 401(k) offers the employer match (free money), a much higher contribution limit, and automatic payroll deductions, but limited fund choices. An IRA offers nearly unlimited fund choices and often lower fees, but a lower limit and no match. The common playbook: contribute to the 401(k) up to the match, then fund an IRA, then return to the 401(k).

What does the 401(k) Calculator do?

Projects how much your 401(k) retirement account will grow. Enter your current balance, annual contribution, employer match percentage, expected annual return, and years until retirement, and the tool estimates your future balance, the total you will have. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.

What formula does the 401(k) Calculator use?

It grows the account with the future-value-of-annuity formula FV = PMT × (((1 + r)^n − 1) / r), where PMT is your annual contribution plus employer match, r the return, and n the number of years. Enter your current balance, contribution, match percentage, and expected return, and the tool shows the projected balance at retirement.

Is the 401(k) Calculator free and private?

Yes — the 401(k) Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.

How accurate is the 401(k) Calculator?

The 401(k) Calculator applies the standard formula: FV = PMT x (((1 + r)^n - 1) / r), with PMT = annual contribution + match. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

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