Free 401k contribution calculator
401k Calculator – Free Online Retirement & Investment Calculator
Use this 401k calculator to see what your 401k could look like by retirement, including your contributions, employer match, fees, growth, and possible monthly income.
401k investment calculator breakdown
401k calculator with match and fee checks
401k calculator over time by age
A quick view of how the balance may change between now and retirement.
How to use the 401k contribution calculator
Start with numbers from your latest 401k statement and pay stub. Enter your age, salary, current balance, contribution rate, and employer match. For a first rough 401k calculator result, you may leave the advanced defaults alone. Then use this 401k contribution calculator to change one number at a time. That makes it easier to see why the result moved.
- Start with age. Enter the age you will turn this year. Then enter the age when you plan to retire.
- Add your balance. Copy the current balance from your latest 401k statement.
- Enter your contribution rate. Type the percentage from your paycheck. If it says 8%, enter 8, not 0.08.
- Use your employer's match wording. If your plan says "50% up to 6%," enter 50 for the match rate and 6 for the match limit. If your plan has no match, enter 0 in both boxes.
- Leave the extra settings alone at first. Open Advanced assumptions later if you want to test fees, return, inflation, salary growth, or withdrawal rate.
401k growth calculator formula
Each month, the 401k calculator applies investment growth and fees, then adds your payroll contribution and estimated employer match. Each year it checks the annual 401k contribution limit. That gives you a 401k projected growth calculator view that is easier to read than one final number. The 401k growth calculator is most useful when you compare one change at a time, such as a higher contribution rate or a lower annual fee.
1. Check the 401k max contribution calculator fields
Employee contribution = salary x contribution percentage, up to the annual 401k limit and any catch-up amount for your age.
If you are far below the limit, raising the percentage usually raises your savings. If you are near the limit, the cap can slow that down. This is the same idea behind checking yearly, monthly, or weekly contribution amounts against the annual limit.
2. 401k employer contribution calculator with match
Employer match = the matched part of your contribution x the match rate. The match limit tells you where the company match usually stops.
If you are below the match limit, contributing a little more may add company money. Once you are above it, the extra money is usually just your own contribution. You can also test raises, inflation, and contribution-rate changes without changing the whole setup.
3. 401k compound growth calculator
Monthly balance = the prior balance plus investment growth, minus fees, plus that month's employee contribution and employer match.
Fees matter because money paid in fees stops growing. The monthly income estimate uses your withdrawal rate and divides the yearly amount by 12. The calculator shows both future dollars and inflation-adjusted today's dollars. A 401k compound interest calculator makes that second layer of growth easier to see.
401k retirement calculator limits to keep in mind
The 401k calculator uses default contribution limits for U.S. 401k plans. They use the 2026 elective deferral limit, the age 50+ catch-up amount, and the age 60-63 super catch-up amount from the IRS-published 2026 limits. Future contribution limits and the 2026 eligible-compensation cap are estimated to grow with the inflation rate you enter. If you are planning from another base year, update the three limit fields.
The estimate also applies the 2026 total annual additions limit of $72,000 or 100% of pay, whichever is lower. Catch-up contributions are excluded from that total.
The employer-match estimate uses one simple formula such as "50% up to 6%." It is intended for a traditional or safe-harbor 401k, not a SIMPLE 401k, Solo 401k, tiered match, vesting schedule, or year-end true-up calculation. Check your plan document when its rules differ.
The estimate leaves out taxes, Social Security, pension income, loans, early withdrawals, Roth vs. traditional tax treatment, and the ups and downs of specific funds. For a 401k retirement calculator check, those limits matter most when you are near the annual cap or close to catch-up age.
401k calculator for retirement planning
Try saving 1% more. Try retiring two years later. Try a lower annual fee. Small changes are easier to understand when you test them one at a time. If your main question is your balance at retirement, compare the retirement age and monthly income number together. A retirement 401k calculator should help you see both, not just a single future balance.
401k investment calculator questions to ask
Use the 401k calculator to ask: am I saving enough to get the full employer match? What happens if I raise my contribution by 1%? How much do fees matter over time? Could this balance support the monthly income I want? If your real question is "how much will be in my 401k" or "what will my 401k be worth," this section is the quick check. The 401k investment calculator view is for comparing return, fees, and salary growth together.
If you are close to age 50, 60, or 63, catch-up contributions can also change the estimate. That is worth checking before you decide your current savings rate is enough.
401k Calculator FAQ
What does this 401k calculator estimate?
This 401k calculator gives you a rough picture of where your 401k could be by retirement. It uses your current balance, salary, contribution rate, employer match, fees, inflation, and expected return. It also estimates the contribution rate needed to reach your monthly target when that target is reachable within the entered plan limits.
Is this a 401k calculator with match?
Yes. If your plan says something like 50% up to 6%, enter 50 as the match rate and 6 as the match limit. That gives you a quick estimate of how much company money may be going into the account. This models one simple traditional or safe-harbor 401k match formula, not SIMPLE, Solo, tiered, vesting, or true-up rules.
Does this include the 2026 IRS 401k contribution limit?
Yes. The default employee deferral limit is set to $24,500 for 2026, with an $8,000 catch-up amount for ages 50 and older and a separate $11,250 super catch-up amount for ages 60 to 63. If you are checking another base year, update those fields. Future limits are estimated to grow with your inflation assumption.
Why include annual fees in a 401k growth calculator?
Because fees come out of money that could otherwise keep growing. A small fee may not look like much this year, but over decades it can make a visible dent.
Is the 401k projection guaranteed?
No. Treat it as a rough planning number. Markets, taxes, fees, plan rules, and inflation can all change what you actually end up with.
How does a retirement 401k calculator estimate monthly income?
It applies the withdrawal rate to the projected balance and divides the yearly amount by 12. It shows both future dollars and inflation-adjusted today's dollars. The target comparison uses today's dollars before taxes and other retirement income.
Can this work as a simple 401k calculator by age?
Yes. The age you turn this year, retirement age, current balance, eligible pay, and contribution rate are enough for a first pass. Use the extra settings to test fees, returns, inflation, salary growth, or catch-up contributions.
Can I use this as a 401k calculator over time?
Yes. The 401k calculator's age-by-age timeline shows how the balance could change between now and retirement. It can help you see whether saving more, waiting longer, or lowering fees changes the path enough to matter. It is built for questions like what your 401k may be worth later, not just today's balance.
Can this cover contribution, growth, retirement, and investment questions?
For a quick check, yes. It covers contribution rate, projected growth, investment return, fees, and retirement income without opening separate tools.
Can this work as a 401k max contribution calculator?
Yes. Compare your employee contribution with the annual limit and catch-up fields. If you are already close to the cap, raising the percentage may not change the estimate as much as you expect.
How does a 401k compound interest calculator show growth?
Your balance can earn returns, and those returns can earn returns later. This 401k calculator applies growth and fees monthly, then adds that month's employee contribution and employer match. That gives you a compound growth view without pretending the same return happens every year in real life.
Can this estimate monthly, yearly, or weekly 401k contributions?
Yes. The input is a percentage of salary, so convert your monthly, yearly, or weekly dollar amount into a yearly percentage first.
Continue planning
2026 401(k) Contribution and Catch-Up Limits
Check the 2026 401(k) employee contribution limit, the age 50 catch-up amount, and the higher catch-up amount for ages 60 through 63.
401(k) Employer Match: What 50% Up to 6% Means
See what a 50% up to 6% 401(k) employer match means in dollars, why it usually tops out at 3% of pay, and what to check in your plan.
Are Your 401(k) Fees Too High?
Learn where 401(k) fees show up, when they are worth questioning, and how to compare costs without confusing unlike investments.
How Much Monthly Income Can a 401(k) Provide?
Convert a projected 401(k) balance into a monthly retirement income estimate and see what can change the take-home number.
How Much Should I Contribute to My 401(k)?
A practical way to choose a 401(k) contribution rate, get your employer match, and test whether saving 1% more fits your budget.