401(k) Calculator
Estimate how much your 401(k) will grow by the time you retire and see the power of employer matching and compound interest.
Basic info
Projections
Retirement Planning
What Is a 401(k) Calculator?
A 401(k) is an employer-sponsored retirement savings plan that allows employees to save and invest a portion of their paychecks before or after taxes. Over time, these savings compound through investment returns, creating a robust financial cushion for retirement.
A 401(k) calculator estimates how your workplace retirement account may grow over time. It lets you simulate different contribution rates, salary increases, and investment return scenarios, helping you determine how much your account might be worth by the time you retire.
The Inputs Explained
Anatomy of a 401(k) Projection
To estimate your long-term growth, the calculator utilizes key variables related to your career and savings behaviors. Understanding these inputs helps you run more accurate projections:
- Current Age & Retirement Age
- Defines the length of the accumulation phase. The longer the timeline, the more time your investments have to compound.
- Annual Salary & Growth Rate
- Your starting salary and the rate at which it increases annually. As your salary grows, your contributions grow proportionally.
- Employee Contribution (%)
- The percentage of your gross salary you choose to defer into your 401(k) account from each paycheck.
- Employer Match & Limit (%)
- The formula used by your employer to match your savings. e.g. 50% match of your contributions up to 6% of your salary.
- Expected Return (%)
- The estimated annual interest rate or return your investments earn inside the 401(k) portfolio.
- Inflation Rate (%)
- The rate at which purchasing power decays. Used to calculate the 'Today's Value' of your future retirement nest egg.
The Mathematical Model
How Are Projections Calculated?
Retirement growth is simulated month-by-month to capture compounding interest and frequent contributions. Lenders and financial institutions use these standard formulas:
Calculates matching company funds per year
Calculates the total additions sent to the account monthly
Compounding math applied monthly over the timeline
Adjusts the final balance for the decay of purchasing power
Typical 401(k) Calculation Example
Let's look at a standard example: a 30-year-old worker earning $80,000, contributing 10% of their salary, receiving a 50% match up to a 6% limit, with 3% annual salary growth and an expected 7% return until retiring at age 67.
| Metric | Value |
|---|---|
| Employee Contribution (Year 1): | $8,000 |
| Employer Match (Year 1): | $2,400 |
| Accumulated Balance at age 67: | ~$1,586,211 |
| Inflation-Adjusted Value (Today's Money): | ~$532,410 |
Traditional vs. Roth 401(k)
Many employer plans offer both Traditional and Roth contribution options. Choosing the correct structure depends on your current tax bracket versus your expected bracket in retirement:
Traditional 401(k)
Best if taxes are higher nowContributions are made with pre-tax dollars, reducing your taxable income today. However, your withdrawals in retirement will be taxed as ordinary income.
Roth 401(k)
Best if taxes will be higher laterContributions are made with after-tax dollars. You get no immediate tax relief, but all qualified withdrawals in retirement are 100% tax-free.
2026 IRS 401(k) Contribution Limits
The IRS regulates annual employee contributions to prevent excessive tax shelter abuse. Ensure you structure your savings inside these bounds:
| Age group | Limit |
|---|---|
| Under Age 50 | $24,500/year |
| Age 50 or Older (Catch-up) | $32,500/year |
| Age 60 to 63 (Super Catch-up) | $35,750/year |
Strategies to Maximize Your 401(k)
Small alterations to your contribution schedule can lead to dramatic differences in your retirement balance over 20-30 years:
- Get the Full Employer Match
- Always contribute at least enough to capture your employer's full match limit.
- Enable Auto-Escalation
- Configure your contributions to increase automatically by 1% each year.
- Minimize Portfolio Fees
- Select low-cost index funds inside your plan rather than high-fee actively managed funds.
- Avoid Loans & Early Cashouts
- Withdrawing money early triggers a 10% penalty and halts the compounding growth of your money.
- Use Salary Increases to Save More
- Direct half of any salary raises straight to your 401(k) before you become accustomed to spending it.
- Contribute to a Roth or Traditional IRA
- Once matching limits are achieved, consider routing excess funds to an IRA.
Comprehensive Retirement Planning
A 401(k) plan is usually just one piece of your overall retirement portfolio. For more thorough financial mapping, combine your calculations with our other tools:
Retirement Income Planner
Combine your 401(k), Social Security payouts, IRA holdings, and pension income streams into a single timeline.
Open Retirement PlannerMortgage & Amortization Calculator
Balance your home payments and mortgage interest with your long-term retirement savings target.
Open Mortgage CalculatorFrequently Asked Questions
An employer match is when your employer contributes money to your 401(k) plan. Typically, it is based on a matching percentage of your own contributions up to a set limit of your annual salary.
This is the maximum percentage of your salary your employer will match. For example, if the limit is 6%, any contributions you make above 6% of your salary will not receive matching company funds.
No. The $24,500 limit (for 2026) applies strictly to your own employee elective deferrals. The combined limit for employer + employee contributions is much higher ($70,000 for 2026).
Inflation gradually decreases the value of a dollar. A million dollars in 30 years will not buy nearly as much as a million dollars today. Inflation adjustments help you see the real buying power of your future balance.
Traditional contributions reduce your taxes now but are taxed when you withdraw in retirement. Roth contributions do not save you taxes today, but withdrawals in retirement are completely tax-free.
Normally, early withdrawals trigger a 10% IRS penalty in addition to regular income tax. However, exceptions exist for hardship withdrawals, loans, or the IRS Rule of 55.
💡 Have an Idea?
Can't find the calculator you're looking for or want to suggest improvements? Let us know and we'll build it for you!