401(k) Calculator - Retirement Savings
Project 401(k) retirement savings with employee contributions, employer match, salary growth, expected annual return, and compound growth.
Enter age, retirement age, salary, current balance, contribution rate, match rate, return, and salary growth to estimate a future 401(k) balance.
401(k) Calculator - Retirement Savings
Project 401(k) retirement savings with employee contributions, employer match, salary growth, expected annual return, and compound growth.
About the 401(k) Calculator
A 401(k) calculator explains workplace retirement savings from contributions, employer match, salary growth, and investment returns with a focused calculation instead of a vague rule of thumb. The inputs mirror the decisions people actually need to make, and the output separates the headline number from supporting figures so assumptions are easier to audit. For searchers comparing alternatives, the 401(k) Calculator gives a repeatable way to check whether a plan is realistic before money, paperwork, or an application is committed.
It compounds the current balance once per year, adds employee contributions and employer match based on salary, grows salary at the end of each year, and repeats the process until the retirement age.
Use the 401(k) calculator for choosing a contribution rate, estimating the value of an employer match, comparing retirement ages, and testing conservative or optimistic return assumptions. The examples below use real numbers and the same calculation path as the form, which makes them useful benchmarks when checking a similar situation. Running conservative, expected, and optimistic scenarios is especially helpful because it shows which input creates the most risk or the most room for improvement.
Read the supporting lines before focusing on the final number. A secondary output can reveal whether the result is being driven by income, rate, time, taxes, depreciation, contribution percentage, or an allowance limit. If the answer is close to a decision threshold, change one input at a time and keep a short note explaining why that assumption is reasonable. That habit makes the 401(k) calculator more useful for conversations with lenders, payroll teams, landlords, accountants, advisors, or household decision makers.
IRS limits, catch-up contributions, vesting, plan fees, Roth versus pre-tax treatment, market volatility, withdrawals, loans, and detailed match caps are not fully modeled. The result should be treated as a planning estimate, not a guarantee or professional opinion. Keep the assumptions with any decision record, compare the output with contracts, policies, statements, or plan documents, and ask a qualified professional when the number will affect lending, insurance, payroll, tax, accounting, or legal decisions.
401(k) Calculator Examples
These worked examples use the same formula as the calculator so the inputs and outputs can be checked directly.
| Input | Output | Notes |
|---|---|---|
| Age 25, retire at 65, $50,000 salary, $5,000 balance, 6% contribution, 3% match, 7% return | About $1,223,850 projected 401(k) balance | Forty years of compounding makes early contributions especially powerful. |
| Age 40, retire at 65, $80,000 salary, $150,000 balance, 10% contribution, 4% match, 7% return | About $1,662,364 projected 401(k) balance | A larger starting balance and higher contribution rate offset the shorter horizon. |
| Age 50, retire at 65, $90,000 salary, $75,000 balance, 15% contribution, 5% match, 6% return | About $652,552 projected 401(k) balance | A higher savings rate helps, but the 15-year timeline limits compounding. |
How to Use the 401(k) Calculator
- Enter current age and the age when contributions are expected to stop.
- Add current annual salary, current 401(k) balance, employee contribution rate, and employer match rate.
- Enter expected annual return and salary growth using whole percentages.
- Calculate the projected balance and compare scenarios with different savings rates or retirement ages.
401(k) Calculator FAQ
Does the 401(k) calculator include employer match limits?
The match rate is applied directly to salary for a simplified projection. Many plans match only up to a contribution cap, so check plan documents before treating the match line as exact.
Are contributions assumed monthly or annually?
The projection compounds annually and adds annual contribution amounts during each modeled year. That convention is useful for planning, but it will differ slightly from a payroll-by-payroll schedule.
Should I enter pre-tax or Roth 401(k) contributions?
Enter the contribution percentage of salary regardless of tax type. The ending balance is an account value and does not estimate future income taxes or Roth tax treatment.
What return rate should I use?
Use a conservative long-term assumption that fits the asset allocation and time horizon. Running lower, expected, and higher return scenarios is better than relying on a single optimistic number.
Does the calculator apply IRS contribution limits?
No. Annual IRS limits and catch-up rules are not enforced. If the entered percentage would exceed legal or plan limits, adjust the contribution assumption before using the result for planning.