401k Calculator

Estimate your retirement savings with employer match and compound growth

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Built by WOWHOW Team · 14+ yrs engineering

401k Calculator is a free, browser-based tool that lets you estimate your retirement savings with employer match and compound growth — with zero signup, zero installation. Your data never leaves your browser. Part of 138+ free developer and business tools at wowhow.cloud, built and maintained by a team with 14+ years of hands-on development experience.

TOOL401k Calculator

Your Details

Current Age

Retirement Age

Current 401(k) Balance ($)

Annual Salary ($)

$75,000 per year

Your Contribution Rate6%

$4,500/yr (2026 limit: $23,500)

Employer Match Rate50%

Percentage of your contribution the employer matches

Employer Match Limit6% of salary

Employer matches up to this percentage of your salary

Expected Annual Return8%

S&P 500 historical average: ~10% (7% after inflation)

Annual Salary Increase3%

2026 IRS Contribution Limits

Under 50

$23,500/year

Age 50+

$31,000/year

Total Limit (incl. employer)

$70,000/year

Projected Retirement Savings

Enter valid details to see your retirement projection

About 401k Calculator

A 401(k) is the primary retirement savings vehicle for most American workers — combining pre-tax contributions, employer matching, and tax-deferred compound growth. Small differences in contribution rate and employer match structure can mean hundreds of thousands of dollars at retirement. This calculator models the 2026 IRS contribution limits, vesting schedules, and compound growth to show your exact projected balance at retirement with a year-by-year breakdown.

How It Works

The 401(k) balance grows from three sources: your employee contributions, employer matching contributions, and investment returns. Employee contribution per year = Salary × Contribution Rate, capped at the IRS limit ($23,500 for 2026, $31,000 with catch-up if age 50+). Employer match = Salary × min(Contribution Rate, Match Limit) × Match Percentage. Combined annual contribution = Employee + Employer contributions.

The balance grows annually: Balance(year) = [Balance(year-1) + Annual Contribution] × (1 + r), where r is the assumed annual return rate (default 7%, representing a diversified equity/bond portfolio net of fees). This is the standard future value formula applied iteratively. The calculator compounds annually for simplicity, though actual 401k plans compound monthly.

Monthly retirement income is estimated using the 4% safe withdrawal rule: Monthly Income = (Final Balance × 0.04) / 12. For a $800,000 balance, that is $2,667/month ($32,000/year) — supplementing Social Security but rarely replacing a full income. The calculator also shows income at the 3.5% rate (more conservative for extended retirements) and estimates the Social Security income gap.

Who Is This For

A 28-year-old earning $75,000 contributing 6% to get their employer's full 50% match on up to 6% wants to see their projected balance at 65 at 7% return ($742,000) vs. no employer match ($495,000).

A 45-year-old who has been contributing only 3% wants to model the impact of increasing to 10% now — the calculator shows how front-loading contributions in the last 20 years affects the final balance.

An employee at a company with a 4-year vesting schedule considering leaving after year 2 wants to see how much employer match they forfeit and whether a higher-salary competing offer compensates.

A 52-year-old evaluating whether to max out catch-up contributions ($31,000 total) for the next 13 years, the additional $7,500/year at 7% adds ~$145,000 to the retirement balance vs. standard contributions.

A couple both maxing out their respective 401ks ($23,500 each) want to project their combined retirement portfolio and estimate total retirement income from both 401ks plus estimated Social Security.

Scope note: Return rate projections are not guaranteed. Actual 401k returns depend on fund selection, expense ratios (which reduce net returns by 0.03-1.5% annually), and market conditions. This calculator does not model Social Security income, other retirement accounts (IRA, pension), or Required Minimum Distributions (RMDs) starting at age 73. Tax treatment at withdrawal (ordinary income tax rates, not capital gains rates) significantly affects real retirement income. A financial advisor can model the full tax picture.

Disclaimer: This calculator is for informational and educational purposes only and does not constitute financial, tax, or legal advice. Results are estimates based on publicly available tax slabs and formulas. Consult a qualified Chartered Accountant, tax professional, or financial advisor for guidance specific to your situation. Built and maintained by the WOWHOW Team with 14+ years of software development experience.

How to Use

Enter your current age and target retirement age

Set your annual salary and current 401(k) balance

Adjust your contribution rate using the slider (default 6%)

Configure employer match rate and match limit to model your company plan

Review your projected balance, monthly retirement income, and growth chart

Frequently Asked Questions

Financial advisors recommend contributing at least enough to get the full employer match — this is essentially free money. Beyond that, aim for 10-15% of your gross salary. The 2026 IRS limit is $23,500 per year ($31,000 if you are 50 or older with the catch-up contribution).

Employer matching means your company contributes additional money to your 401(k) based on how much you contribute. A common structure is 50% match up to 6% of salary — meaning if you contribute 6%, your employer adds another 3%. Always contribute enough to maximize this free benefit.

For 2026, the IRS employee contribution limit is $23,500. Workers aged 50 and older can contribute an additional $7,500 catch-up contribution for a total of $31,000. The total annual limit including employer contributions is $70,000.

A traditional 401(k) uses pre-tax dollars — you get a tax deduction now but pay income tax on withdrawals in retirement. A Roth 401(k) uses after-tax dollars — no deduction now, but withdrawals in retirement are completely tax-free. Choose Roth if you expect to be in a higher tax bracket in retirement.

You can withdraw from your 401(k) without the 10% early withdrawal penalty starting at age 59.5. If you leave your job at age 55 or later, you may access that employer plan penalty-free under the Rule of 55. Required Minimum Distributions (RMDs) begin at age 73.

You have four options: (1) Roll over to your new employer's 401k. (2) Roll over to a traditional IRA — broadest investment options. (3) Leave in the old employer plan if allowed. (4) Cash out — not recommended, triggers income tax plus 10% penalty before age 59.5. Rollovers to IRA or new 401k preserve tax-deferred growth and avoid penalties.

Many employers vest their matching contributions over 3-6 years. If you leave before fully vested, you forfeit unvested employer contributions. For example, in a 4-year graded vesting schedule, you own 25% of employer contributions after year 1, 50% after year 2, 75% after year 3, and 100% after year 4. This calculator models full vesting — subtract unvested amounts if you plan to leave before the schedule completes.

Always contribute enough to capture the full employer match first — that match is an immediate 50-100% return on your contribution. Beyond the match, compare your student loan interest rate vs. expected 401k return. Federal student loans at 5-6% vs. S&P 500 historical ~10%: the math favors 401k contributions. Private student loans at 8-12%: pay those down first, then maximize 401k.