401(k) Retirement Calculator

To use this 401(k) calculator effectively, follow these steps:

1. Enter your current age and planned retirement age to define your investment time horizon. The longer the horizon, the more time your money has to compound and grow.
2. Enter your current 401(k) balance. You can find this on your most recent 401(k) statement or by logging into your plan provider's website (such as Fidelity, Vanguard, or Schwab).
3. Enter your annual gross salary before taxes and deductions. This is the base figure used to calculate contribution amounts.
4. Set your employee contribution rate as a percentage of salary. Review the IRS limits to ensure your percentage does not exceed the annual maximum ($23,500 in 2025 for those under 50).
5. Set your employer match rate and match limit. Check your employer's benefits handbook or HR portal to find the exact matching formula. For example, if your employer matches 50% of contributions up to 6% of salary, the employer match rate is 3% and the match limit is 6%.
6. Adjust the annual salary increase to reflect expected raises. A 2% to 4% annual increase is typical for most industries.
7. Set the expected annual return. A 7% return is commonly used as a long-term average for diversified stock portfolios after inflation, while a more conservative balanced portfolio may return 5% to 6%.

The results update instantly and show your projected balance at retirement, total employee and employer contributions, investment growth, and estimated monthly retirement income based on the 4% withdrawal rule. To maximize your 401(k), always contribute at least enough to capture the full employer match, increase your contribution rate by 1% each year, and avoid early withdrawals that trigger penalties and taxes.

A 401(k) retirement calculator projects the future value of your 401(k) account based on your current balance, annual contributions, employer matching, salary growth, and expected investment returns. It helps you understand how much money you may have available when you retire and whether you are on track to meet your retirement goals.

A 401(k) is an employer-sponsored retirement savings plan that allows workers to contribute a portion of their pre-tax wages directly into a tax-advantaged investment account. The plan is named after Section 401(k) of the Internal Revenue Code, which was established in 1978 and has since become the most popular employer-sponsored retirement plan in the United States. As of 2025, more than 70 million American workers participate in a 401(k) plan.

One of the most valuable features of a 401(k) is employer matching. Many employers match a percentage of your contributions, which is essentially free money added to your retirement savings. A common match structure is 50% of contributions up to 6% of salary, or a dollar-for-dollar match up to 3% to 5% of salary. Financial advisors universally recommend contributing at least enough to capture the full employer match, as failing to do so means leaving compensation on the table.

For 2025, the IRS sets the employee contribution limit at $23,500 for workers under age 50. Workers aged 50 and older can make an additional $7,500 in catch-up contributions, bringing their total to $31,000. A new provision for 2025 allows workers aged 60 through 63 to contribute enhanced catch-up amounts of $11,250 for a total of $34,750. The combined employee and employer contribution limit is $70,000.

There are two main types of 401(k) plans. A traditional 401(k) uses pre-tax dollars, lowering your taxable income now but requiring you to pay ordinary income tax on withdrawals in retirement. A Roth 401(k) uses after-tax dollars, meaning you pay taxes now but qualified withdrawals in retirement are completely tax-free. Choosing between the two depends on whether you expect to be in a higher or lower tax bracket in retirement.

Another important concept is vesting. While your own contributions are always 100% yours, employer matching contributions may be subject to a vesting schedule. Cliff vesting means you become fully vested after a set period (often 3 years), while graded vesting gradually increases your ownership over several years. If you leave your employer before being fully vested, you may forfeit some or all of the employer match.

The calculator uses a year-by-year compounding model that accounts for employee contributions, employer matching, salary growth, and investment returns. For each year until retirement, the following calculations are performed:

Core formulas applied each year:

• Employee Contribution = Annual Salary × Employee Contribution Rate
• Employer Contribution = Annual Salary × Employer Match Rate (when Employee Rate ≥ Match Limit) OR Annual Salary × Employer Match Rate × (Employee Rate / Match Limit) when contributing less than the match limit
• End-of-Year Balance = (Previous Balance + Employee Contribution + Employer Contribution) × (1 + Annual Return Rate)
• Next Year Salary = Current Salary × (1 + Annual Salary Increase Rate)

Variable definitions:

The process repeats for each year until retirement age. After computing the final balance, the monthly retirement income is estimated using the 4% rule: Monthly Income = Balance × 0.04 / 12. This widely cited guideline suggests withdrawing 4% of your portfolio in the first year of retirement, adjusted for inflation thereafter, to sustain your savings for approximately 30 years.

Example 1: Young Worker Starting at Age 25

Sarah is 25 years old, earns $55,000 per year, and has just started contributing to her 401(k) with a $0 current balance. She contributes 10% of her salary ($5,500 per year), and her employer matches 100% up to 4% of salary ($2,200 per year). She expects 3% annual raises and a 7% average annual return. By age 65, after 40 years of contributions, Sarah's projected 401(k) balance is approximately $2,150,000. Her total employee contributions would be roughly $415,000, employer contributions around $166,000, and the remaining $1,569,000 comes from investment growth. Using the 4% rule, she could withdraw approximately $7,167 per month in retirement. This example illustrates the extraordinary power of starting early and letting compound growth work over four decades.

Example 2: Mid-Career Catch-Up at Age 45

Michael is 45 years old, earns $120,000 per year, and has $150,000 already saved in his 401(k). Realizing he needs to accelerate his savings, he increases his contribution to 15% of salary ($18,000 per year) and takes advantage of catch-up contributions once he turns 50. His employer matches 50% up to 6% of salary (a 3% match rate). With 2% annual raises and a 7% return, Michael's projected balance at age 65 is approximately $1,450,000. His monthly retirement income under the 4% rule would be about $4,833. While starting later means less total growth, his higher salary and aggressive contribution rate still build a substantial nest egg over 20 years.

Example 3: Employer Match Maximization

Lisa earns $90,000 per year and her employer offers a generous dollar-for-dollar match up to 6% of salary. She is currently contributing only 4% of her salary, which means she is receiving an employer match of only 4% instead of the full 6%. By increasing her contribution from 4% to 6%, she captures an additional $1,800 per year in employer matching. With a current balance of $50,000, 3% annual raises, and a 7% return over 25 years (age 35 to 60), her projected balance jumps from approximately $820,000 at the 4% contribution level to approximately $1,020,000 at 6%. That simple 2% increase in her contribution rate, combined with the full employer match, adds roughly $200,000 to her retirement savings. This demonstrates why financial advisors always emphasize contributing at least enough to capture the full employer match before directing savings elsewhere.