The 401k Calculator projects a retirement balance from current savings, annual contributions, employer match, and an assumed return. Enter salary, contribution rate, match rules, years to retirement, and return, and the 401k Calculator compounds the account year by year to a planning balance.
Employer match is free money within plan limits, and missing it leaves growth on the table. The 401k Calculator models match as a percent of employee contributions up to a percent of salary, then compounds employee money and match together at the assumed return.
*These results are estimates for information only, not investment, tax, or retirement advice. Markets do not return a constant rate.*
Project a 401k balance at retirement with the 401k Calculator
The 401k Calculator projects a 401k balance at retirement by compounding the current balance and each year’s contributions over the years until retirement. The projection assumes a constant annual return for clarity; real markets vary. Each year, employee contributions and any match are added, then the balance grows by the return rate.
Starting from a $50,000 balance, a $70,000 salary, a 10% employee contribution ($7,000), a 50% match on contributions up to 6% of salary ($2,100 match), and a 7% return for 20 years, the planning balance reaches about $592,657. The 401k Calculator shows year-by-year growth so the climb is visible rather than a single end figure with no path.
Taxes and withdrawals are not deducted in this projection. The result is a pre-withdrawal balance under the stated assumptions.
Include the employer match with the 401k Calculator
The 401k Calculator includes the employer match by adding a capped match amount to the annual contribution that compounds. Match rate and match cap are separate inputs. Match = match rate × min(employee contribution, salary × match cap percent).
On a $70,000 salary with a 50% match up to 6%, the first $4,200 of employee contributions can attract up to $2,100 of match. Contributing 10% ($7,000) still earns only $2,100 of match under that cap, because the match stops at 6% of salary. Contributing below the cap leaves match unclaimed. The 401k Calculator shows the yearly match beside the projected balance so the cap’s effect is obvious.
Plans differ: some match dollar-for-dollar to a lower cap; some use tiered formulas. Enter the plan’s published rule; the 401k Calculator does not invent a plan document.
Grow contributions over time with the 401k Calculator
Contributions grow the balance both by adding cash and by giving that cash years to compound. The 401k Calculator treats the annual contribution (employee plus match) as recurring fuel for the projection. Earlier contributions spend more years in the market under the constant-return assumption, so they contribute more to the ending balance than the same dollars deposited near retirement.
Raising the contribution rate raises both employee deferrals and, until the cap, match. Raising salary raises the dollar size of a percent-based contribution and the match cap. The 401k Calculator recalculates when those inputs change so sensitivity is easy to see.
Steady contributions plus match, compounded over decades, typically dominate the starting balance for younger workers. The 401k Calculator separates those pieces in the growth view when the engine reports them.
Compare Roth and traditional with the 401k Calculator
Roth and traditional 401k contributions differ by tax timing: traditional contributions are pre-tax in a typical plan, while Roth contributions are post-tax and qualified withdrawals are tax-free under current rules. The 401k Calculator can frame both at a planning level when tax assumptions are entered; the core growth engine still compounds the account balance.
A traditional balance may look larger before tax because contributions reduced taxable income going in, but withdrawals are generally taxable. A Roth balance is funded with after-tax pay, so comparing contribution rates requires care about whether the percent is of the same paycheck basis. The 401k Calculator does not replace tax software. Use it to compare growth paths, then confirm tax treatment with a professional and the plan’s documents.
Match contributions, when present, often follow traditional tax treatment even when employee dollars are Roth. Check the plan; do not assume the calculator’s growth equals take-home retirement income.
Vesting schedules can delay ownership of match dollars. The 401k Calculator compounds the match as if it stays in the account; it does not haircut for unvested amounts that would be forfeited on a job change. If vesting is incomplete, treat the projected match share cautiously. Loan provisions, hardship rules, and required minimum distributions later in life are also outside this growth view.
Contribution limits change with IRS updates and with age-based catch-up rules. Enter an annual contribution that respects the limit that applies to the year being planned. The 401k Calculator will compound whatever annual amount is typed; it will not reject an over-limit figure on its own.
Salary growth over a career raises future percent-based contributions. The 401k Calculator’s simple path can hold salary fixed, which understates later deferrals if raises are expected. To approximate raises, increase the contribution dollar amount in a second scenario or raise salary in a sensitivity run. The constant-return warning still applies: the balance is a plan, not a promise.
Frequently asked questions
How does employer match work in the 401k Calculator?
Employer match in the 401k Calculator equals match rate times the employee contribution up to the salary cap percent. The tool adds that match to the annual contribution that compounds. On $70,000 with 50% up to 6%, match tops out at $2,100 per year under those inputs.
Does this include taxes or withdrawals?
This does not include taxes or withdrawals. The 401k Calculator projects a pre-withdrawal balance under the stated return. Net spendable income in retirement depends on tax rules and withdrawal strategy outside this page.
Are projections guaranteed?
Projections are not guaranteed. The 401k Calculator uses a constant return assumption for education and planning. Actual investment results can be higher or lower, and past growth is not a promise of future growth.
What if the contribution exceeds the match cap?
If the contribution exceeds the match cap, match stops at the capped amount while employee contributions can continue. The 401k Calculator still compounds the full employee deferral entered, but match does not rise past the cap. That is why contributing at least to the cap is the usual first target.
Can the 401k Calculator model catch-up contributions?
The 401k Calculator models the annual contribution amount entered; if catch-up contributions apply by age, include them in that annual figure. The tool does not automatically detect age-based IRS limits. Confirm current limits with plan and IRS sources.
How does the 401k Calculator relate to compound interest?
The 401k Calculator uses the same compounding family as the Compound Interest Calculator, with contribution and match layers on top. Linking both keeps retirement math consistent with the hub’s TVM engine. Use compound interest for a generic deposit; use this page when match rules matter.
Summary
The 401k Calculator projects a retirement balance from current savings, employee contributions, employer match, and a constant assumed return. A $50,000 start, $70,000 salary, 10% deferral, 50% match up to 6% ($2,100), and 7% for 20 years plans to roughly $592,657 before taxes and withdrawals.
Match is capped; contributions above the cap still grow but do not earn extra match. Roth versus traditional is mainly a tax-timing choice around that growth. Results are estimates only, not investment or tax advice.