Money
401k Calculator
Enter your current 401k balance, salary, contribution rate, employer match, annual return, salary growth, and years until retirement. The calculator projects year by year and estimates the final balance, total contributions, and investment growth.
e.g. 25,000
e.g. 75,000
Contributions and employer match
Of salary. · e.g. 10
Of eligible contributions. · e.g. 50
Up to this % of salary. · e.g. 6
Growth assumptions
e.g. 7
e.g. 3
e.g. 30
Estimated balance after 30 years
$1,454,148.32
Total contributions $463,860.30 · investment growth $965,288.01
Year-by-year (first three + final)
- Year 1End balance $36,500.00
- Year 2End balance $49,097.50
- Year 3End balance $62,878.10
- Year 30End balance $1,454,148.32
Estimate only. Real returns, fees, contribution limits, vesting, and timing can change the final number.
Examples
$25k balance · 10% / 50% match (6% cap) · 7% · 3% · 30 yr
First year contribution $9,750 · final balance ≈ $1.45M
Same plan, 5% contribution (below match limit)
First year contribution $5,625 · captures full match band
Same plan, 0% employer match
First year contribution $7,500 · no match dollars added
How it works
The calculator runs a simple annual projection. Each year it applies the annual return to the starting balance, adds the employee contribution and any employer match, and then carries the new balance into the next year. Salary grows each year by the salary growth rate.
Employee contribution
employee = salary × contribution rate
Employer match
match = salary × min(contribution rate, match limit) × match rate
Yearly contribution
yearly contribution = employee + match
Projected balance
new balance = prior balance × (1 + annual return) + yearly contribution
This is a simplified annual projection. Real 401k plans can compound and receive contributions throughout the year, and actual returns vary by year.
What is a 401k calculator?
A 401k calculator estimates the future value of an employer-sponsored retirement account by projecting contributions and investment growth year by year. It is useful for setting a target contribution rate, checking whether you are on track for retirement, and comparing scenarios such as raising your contribution or capturing more of an employer match.
How the 401k calculator works
For each year of the projection, the calculator:
- Applies the annual return to the starting balance.
- Computes the employee contribution from salary and the contribution rate.
- Computes the employer match using the match rate and the match limit (eligible rate = min(contribution rate, match limit)).
- Adds the contributions to the balance.
- Grows the salary for the next year by the salary growth rate.
The result includes the final balance, total employee contributions, total employer match, and the implied investment growth.
Employee contributions
Employee contributions are usually expressed as a percent of salary, so the dollar amount scales as you get raises. A $75,000 salary with a 10 percent contribution rate sends $7,500 into the plan in the first year. Contributions can be pre-tax (traditional 401k) or after-tax (Roth 401k), depending on the plan; the calculator handles only the balance projection, not the tax treatment.
Employer match
Many employers match part of what the employee puts in, up to a cap. A common pattern is 50 percent match up to 6 percent of salary. That means the match rate is 50 percent and the match limit is 6 percent. If the employee contributes 10 percent of salary, only the first 6 percent is eligible for the match. The match dollars are: salary times the eligible rate (6 percent in that case) times the match rate (50 percent).
Employer match rules vary widely. Some employers match 100 percent up to a low cap; some use a tiered formula; some do not match at all. Enter the rates that match your plan.
Annual return and compounding
Annual return is the assumed average growth rate of the investments inside the 401k. The calculator applies the return to the starting balance each year before adding the year's contributions. Compounding does the heavy lifting in long projections: even modest yearly returns build up over decades, which is why early contributions matter so much.
Real returns are not constant. Markets go up and down, and a single average is a planning estimate, not a forecast. Consider running scenarios at different return assumptions to see how sensitive the final balance is.
Salary growth
Salary growth raises the dollar amount of contributions each year because contributions are a percent of salary. Even a small annual raise compounds over a 30-year career. The default 3 percent is roughly long-run wage growth in the U.S.; raise or lower it to match your situation.
401k balance projection
The calculator carries balance and salary forward year by year. The annual sequence is: grow balance by return, add employee and match contributions, raise salary for the next year. The result panel shows the first three years and the final year so you can see how the balance scales. For comparing percentage scenarios in plain math, the percentage calculator and percentage increase calculator can help.
Worked example
Current 401k balance $25,000, annual salary $75,000, employee contribution 10 percent, employer match 50 percent, match limit 6 percent, annual return 7 percent, salary growth 3 percent, 30 years.
- First year employee contribution: 75,000 × 10% = $7,500
- First year employer match: 75,000 × 6% × 50% = $2,250
- First year total contribution: $9,750
- Final year salary (year 30): ≈ $176,742
- Total employee contributions over 30 years: ≈ $356,816
- Total employer match over 30 years: ≈ $107,045
- Investment growth: ≈ $965,288
- Estimated final 401k balance: ≈ $1,454,148
The calculator produces these same numbers for these inputs. The bulk of the final balance comes from investment growth, which is the practical reason starting early and capturing the full employer match matters so much.
Common mistakes
- Leaving employer match on the table. If the match limit is 6 percent of salary and you contribute less than 6 percent, you are giving up matching dollars.
- Confusing match rate and match limit. The rate is how much the employer adds (50 percent, 100 percent). The limit is the cap on the eligible contribution (6 percent of salary, for example).
- Treating a single average return as a guarantee. Markets fluctuate; the average is only an estimate.
- Forgetting that a 401k has annual contribution limits set by the IRS. The calculator does not enforce them; check your plan.
- Ignoring fees. Plan and fund fees compound against you the same way returns compound for you.
Related tools
- Roth IRA calculator for projecting an individual after-tax retirement account.
- Paycheck calculator for estimating gross and take home pay, including pre-tax 401k deductions.
- Percentage calculator for percent-of-a-number questions.
- Percentage increase calculator for comparing growth rates side by side.
- Dividend calculator for projecting dividend income from a holding.
- All money calculators.
Disclaimer. This calculator is an estimate for general planning. Actual 401k balances can vary based on market returns, fees, contribution limits, employer match rules, vesting, taxes, withdrawals, plan rules, and timing of contributions. It is not investment, tax, or retirement advice, and it does not guarantee any return.
Frequently asked questions
A 401k calculator estimates the future balance of a 401k account by projecting year by year. Each year it adds employee contributions and any employer match, then applies the expected annual return. Salary can grow each year, which gradually raises the dollar amount of contributions. The result is an estimate based on the assumptions you provide.
Employee contribution dollars = salary × contribution rate. For example, a $75,000 salary with a 10% contribution rate puts $7,500 into the plan per year. Most calculators express the contribution as a percent of salary so the amount scales with raises.
Many employers match a portion of what the employee contributes, up to a cap. A common pattern is 50% match up to 6% of salary, which means the employer adds 50 cents for every dollar the employee contributes, but only on the first 6% of salary. If the employee contributes 10% of salary, the match only applies to the first 6%.
The match limit is the maximum percentage of salary the employer is willing to match. A 6% match limit means the employer only matches contributions up to 6% of salary. Anything the employee contributes above the limit is still pre-tax (or Roth) but it is not matched. Match limits and rates vary widely by employer.
Annual return is the average rate the investments in the 401k earn each year. A higher long-run return increases the final balance through compounding. Real returns are not constant; some years are higher, some are negative. A 401k projection that assumes a single average return is a planning estimate, not a forecast.
Salary growth raises the dollar amount of contributions each year because employee and employer match contributions are usually a percent of salary. Even a small annual raise compounds, so contributions in the final years are typically much larger than in the first year.
No. The calculator uses the employee contribution percent you enter and does not cap contributions at the annual IRS limit. If you want to model the IRS limit, set the employee contribution percent so that the dollar amount stays under your plan's allowed maximum. Real plans enforce the IRS limit automatically.
No. A 401k is an employer-sponsored retirement plan with payroll contributions and often an employer match. A Roth IRA is an individual account funded with after-tax dollars. The two can be used together. The Roth IRA calculator projects after-tax retirement savings on the individual side.
No. The result is an estimate based on the assumptions you enter. Real investment returns vary, fees apply, salary growth changes, plan rules differ, contribution limits move over time, and life events affect contributions. Use the estimate for planning, not as a guarantee.
A yearly check-in is usually enough. Update sooner if your salary, contribution rate, or employer match changes, if your investment mix shifts, or if your target retirement timeline moves. Big changes in assumptions can move the projection a lot.
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