AtlasCalcsUtility Calculation Suite
2026-09-21 7 min read

Roth 401(k) Calculator

The 401(k) balance at retirement, split by you, the match and growth for your 401(k). Live calculator with worked steps and charts.

Calculator

Annual Salary
$
Your Contribution(%) Help
%

Share of salary you contribute to the 401(k).

Employer Match Rate(%) Help
%

Common formula: 50% match. A 100% match doubles every matched dollar.

Match Applies Up To(%) Help
%

Employers typically match contributions up to 3–6% of salary.

Current Retirement Savings Help
$

Everything saved so far across 401(k)s, IRAs and taxable accounts.

Current Age(years)
years
Retirement Age(years)
years
Expected Annual Return(%) Help
%

Before inflation. A 60/40 stock-bond mix has returned roughly 7% a year long-term.

This 401(k) calculator runs on standard retirement mathematics: contributions compound monthly, withdrawals are tested against growth, and every figure updates live as you type.

Results

Optimal

Projected 401(k) at Retirement

$1,772,054

Employer Match per Year

$2,250

Free money — an instant return on your contributions.

Match + Its Growth

$337,698

Your Contributions + Growth

$1,434,356

You Contribute per Year

$6,000

Years of Growth

35years

Live results update as you type — currently showing projected 401(k) at retirement of $1,772,054. Replace the defaults with your own numbers for an exact plan.

Visualizations

Annual Inflows

6,000You
2,250Match

Who Funded the 401(k)

You81%
Employer match19%

Formula

Employee contributions plus the employer match form a monthly stream compounded to retirement, added to the grown current balance.

FV = PV × (1 + r)^n + (employee + match)/12 as monthly annuity

Variables

SymbolNameUnitDescription
SalaryAnnual salary$Match base.
MatchEmployer match$/yrCapped free money.
rReturn%Annual growth.

Explanation

Your 401(k) at the finish line — split into your money, the employer’s money, and growth.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Compute the annual employer match from salary, your rate and the cap.

Match = min(your contribution, cap × salary) × match rate
Salary:$75,000
Your rate:8.00%
Match rate:50.00%
Cap:6.00%
Result: $2,250/year from employer
Step 2

Combine employee + employer money into a monthly investment stream.

Monthly = (employee + match) ÷ 12
Result: $688/month invested
Step 3

Compound current balance plus the monthly stream to retirement.

FV = lump-sum growth + annuity growth
Result: $1,772,054 projected
Final Answer
$1,772,054

Worked Examples

See how the calculator works with different scenarios.

Scenario

The roth 401(k) calculator run on the values above, showing the full calculation path rather than only the answer.

Inputs

Annual Salary:$75,000
Your Contribution:8.00%
Employer Match Rate:50.00%
Match Applies Up To:6.00%

Calculation

1. Compute the annual employer match from salary, your rate and the cap. → $2,250/year from employer 2. Combine employee + employer money into a monthly investment stream. → $688/month invested 3. Compound current balance plus the monthly stream to retirement. → $1,772,054 projected

Result

Projected 401(k) at Retirement: $1,772,054

Interpretation

$1,772,054 in 35y; $2,250/yr match turns into $337,698.

Understanding Your Result

Your Result: Projected 401(k) at Retirement: $1,772,054

Typical range: A 6% contribution with a 50% match to 6% is effectively a 3%-of-salary raise — never leave it unclaimed.

What This Means

Your 401(k) at the finish line — split into your money, the employer’s money, and growth.

Why It Matters

$1,772,054 in 35y; $2,250/yr match turns into $337,698.

Professional Interpretation

$1,772,054 in 35y; $2,250/yr match turns into $337,698.

How this is calculated

Employee contributions plus the employer match form a monthly stream compounded to retirement, added to the grown current balance.

What drives the result

Traditional accounts give a tax break now and tax withdrawals later; Roth accounts reverse it. The winner is decided almost entirely by your marginal rate today versus in retirement — everything else is detail.

Recommendations

  • •Raise contributions beyond the match toward 15% of salary total.
  • •Use Roth 401(k) contributions if you expect higher taxes later.

Educational Content

Introduction

The US retirement system is a menu of tax wrappers — 401(k)s, Traditional and Roth IRAs — each with its own contribution limits, match rules, distribution requirements and conversion options. Every figure on this page prices those rules: matches captured, taxes due, RMDs owed, and which wrapper wins at your tax rates.

Concept Explanation

Traditional accounts give a tax break now and tax withdrawals later; Roth accounts reverse it. The winner is decided almost entirely by your marginal rate today versus in retirement — everything else is detail.

Applications

▸Capturing the full 401(k) employer match before saving anywhere else
▸Choosing Roth vs Traditional contributions at your current bracket
▸Timing Roth conversions and RMDs to smooth lifetime taxes

Benefits

  • •Puts a dollar value on the employer match and on unclaimed match money
  • •Shows conversion tax today versus tax saved tomorrow in one comparison
  • •Uses IRS table factors for RMDs so the number matches your statement

Limitations

  • •Uses single flat tax rates — real filings blend brackets, states and Social Security rules
  • •Ignores contribution and income limits that phase out deductions and Roth eligibility
  • •RMD factors follow the Uniform Lifetime Table; some plans use different tables

Best Practices

  • •Contribute to the 401(k) match cap first, then max an IRA, then return to the 401(k)
  • •Pay conversion tax from taxable cash, never from the converted balance
  • •Run Roth conversions in low-income windows: job gaps, sabbaticals, early retirement

Common Misconceptions

Myth: A 401(k) loan is free money since I pay myself interest.
Truth: The interest is double-taxed and the borrowed sum misses market growth — the true cost is the lost compounding.
Myth: Roth is always better than Traditional.
Truth: At a much lower retirement rate, Traditional wins; the answer flips with brackets, which is why most people should hold both.

Practical Tips

  • •Never contribute below the match cap.
  • •Push total savings toward 15% of salary including the match.

Common Mistakes

Ignoring vesting.
Unvested match is forfeited if you leave early — check the schedule.
Leaving the match in cash.
Default money-market allocations silently waste the match’s compounding.

Assumptions

This calculator makes the following assumptions to provide estimates:

Flat salary: No raises; raises would raise both contributions and match.
Full vesting: All matched money is treated as yours.

Limitations

Be aware of these limitations when using this calculator:

Limitation: Uses single flat tax rates — real filings blend brackets, states and Social Security rules
Limitation: Ignores contribution and income limits that phase out deductions and Roth eligibility
Limitation: RMD factors follow the Uniform Lifetime Table; some plans use different tables

Frequently Asked Questions

Answers to common questions about this calculator.

How much will my 401(k) be worth at retirement?
Compound the current balance plus monthly employee-and-match contributions to retirement age.
Is the match really worth much?
A 3%-of-salary match compounded over 30 years is often six figures — the highest guaranteed return available.
Who uses the roth 401(k) calculator?
It is used by savers planning their 401(k), by advisers modelling retirement scenarios before clients commit, and by near-retirees stress-testing income, taxes and timing. It sits in the 401(k) group of the Retirement section of Atlascalcs.
How accurate is the roth 401(k) calculator?
Every figure follows directly from the inputs using standard retirement mathematics, so it is accurate to the quality of the values you enter. Markets compound unevenly and tax rules change, so treat smooth projections as planning guides and re-run yearly with actual balances.
How accurate is the Roth 401(k) Calculator?
Every figure follows directly from your inputs using standard retirement mathematics, so accuracy depends on the quality of the return, inflation and spending assumptions you enter. Markets, taxes and life events will differ from any smooth projection.
Should I use nominal or real returns in the Roth 401(k) Calculator?
Enter nominal (before-inflation) returns — the page converts to real purchasing power internally wherever the 401(k) math needs it, and shows today’s-dollar equivalents alongside nominal figures.

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Related Guides

Deepen your understanding with these educational resources.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Employer match
Free 401(k) money: the employer adds a percentage of your contributions up to a cap, e.g. 50% of your 6%.
Compounding
Growth on past growth: returns earned this year themselves earn returns in later years, which is why early savings dominate.

Authoritative References

Trusted sources and standards referenced by this calculator.

Applicable Standards

Monthly compounding for accumulation; annual steps for drawdown schedulesReal (inflation-adjusted) returns used wherever purchasing power mattersRMD factors from the IRS Uniform Lifetime Table (2022+)Social Security factors from SSA early-reduction and delayed-credit formulasMoney rounded for display only; all calculations run at full precision

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Page Information

Last Updated:

2026-09-21

Version:

2.0.0

License:

Free to use for educational and professional purposes.