401(k) Calculator
Estimate a future 401(k) balance from current savings, salary, employee contributions, employer matching, expected return and time to retirement.
Enter your values
Change any assumption and calculate again to compare scenarios.
How This 401(k) Calculator Works
The calculator uses the transparent method shown on this page: Future value uses monthly compounding. Annual employee contribution = salary × contribution %. Employer contribution = eligible matched salary contribution × match rate. The calculation is performed locally in your browser. The core values used by this tool are current 401(k) balance, annual salary, employee contribution (%), employer match rate (%), employer match applies up to salary (%), expected annual return (%), years until retirement. Because the formula and supporting figures are visible, the answer can be checked independently rather than treated as a black-box result.
For reliable comparisons, use inputs from the same time period and definition. A ratio based on annual figures should not be mixed with a monthly amount unless the formula explicitly calls for it. For money calculations, the currency selector changes formatting only; it does not convert exchange rates.
How to Use the Calculator
- Enter the requested values using the labels and units shown.
- Select Calculate to run the formula locally in your browser.
- Review the headline result together with the supporting figures; those details are included to make the result easier to audit.
- On smaller screens, the result opens as a compact bottom panel inside the current viewport, so the answer is visible without scrolling down through the page.
- Use Copy Result, Share Result or Save Result Image when you need to keep the calculation.
Worked Example
With a 25,000 current balance, 60,000 salary, an 8% employee contribution, a 50% employer match up to 6% of salary, a 6% annual return and 25 years, the calculator adds employee and eligible employer contributions each month and compounds the balance over the selected horizon.
When checking the example with your own figures, change one input at a time. This makes it easier to see which assumption caused the result to move and helps catch data-entry mistakes before the number is reused elsewhere.
Common Uses
- Estimate how regular workplace-plan contributions may accumulate over time.
- Compare employee contribution rates while holding other assumptions constant.
- See the separate effect of employee deposits, employer matching and investment growth.
- Run conservative and optimistic return scenarios without changing the underlying formula.
The calculator is designed for quick planning and verification. It is especially useful when you already know the source values and want a consistent calculation without building a spreadsheet formula from scratch.
How to Interpret the Result
Treat the projected balance as a scenario, not a guarantee. The result assumes a constant salary, contribution percentage, match structure and annual return for the entire period. Actual investment returns vary, employer plans can change, and fees or withdrawals can materially affect the balance.
Keep the supporting values with the headline answer whenever the result may be reviewed later. A saved result is more useful when the original assumptions can still be understood, which is why the result card shows several supporting figures rather than only one number.
Common Search Questions About 401(k) Calculator
How do I calculate 401(k)?
Use the calculator on this page and enter the requested values. Estimate a future 401(k) balance from current savings, salary, employee contributions, employer matching, expected return and time to retirement.
How can I get the 401(k) result quickly?
Enter the required values, calculate, and review the result together with its supporting figures. On rebuilt mobile calculators, the answer is brought into the current viewport so the result is easy to find.
What values do I need to calculate 401(k)?
Use the inputs shown in the calculator form and keep units consistent. For important decisions, use measured or verified values and review the page assumptions before relying on the result.
Important Limitations
This calculator does not enforce contribution limits, tax rules, vesting schedules, plan fees, salary growth, catch-up rules or required distributions. It is not tax, retirement or investment advice. Confirm current plan rules and applicable limits with the plan administrator or an appropriately qualified professional.
Results are estimates based only on the values entered. Before using a figure for a contract, filing, investment decision, loan application, payroll action or other important purpose, compare it with the source documents and rules that actually apply to that situation.
Privacy, Mobile Results and Downloads
The arithmetic runs in the browser. Values entered into the calculator are used by the page to generate the displayed result. Saving a result image creates a graphic locally from the displayed output so the user does not need to capture surrounding navigation or advertisements.
On phones and other narrow screens, the result is presented immediately as a bottom result panel. The page behind it is temporarily prevented from scrolling while the panel is open. This keeps the calculated answer and result actions close to the user even when the explanatory article below the calculator is long.
Frequently Asked Questions
Does the calculator include employer matching?
Yes. Enter the employer match rate and the percentage of salary up to which the match applies.
Does it assume salary increases?
No. Salary is held constant so the result isolates the contribution and return assumptions you enter.
Does it enforce annual 401(k) contribution limits?
No. Contribution limits can change, so the calculator intentionally does not hard-code a legal limit. Check your current plan and applicable rules.