Roth IRA Calculator

What Is a Roth IRA Calculator?

A Roth IRA Calculator is a free online tool that estimates how much your Roth Individual Retirement Account (IRA) could be worth when you retire. It uses your current balance, annual contributions, expected investment return, and retirement age to project your future savings.

A Roth IRA lets you invest after-tax money and make tax-free qualified withdrawals in retirement.

Our calculator applies the 2026 age-based IRA contribution limits to its projections and compares your estimated Roth IRA balance with a taxable investment account.

How to Use the Roth IRA Calculator

Follow these steps to estimate your future retirement savings:

1. Current Balance: Enter the amount already saved in your Roth IRA. Enter $0 if you're starting from scratch.

2. Annual Contribution: Enter the amount you want to contribute each year. The calculator applies the 2026 age-based contribution limits.

3. Maximize Contributions: Select Yes to calculate using the maximum annual contribution limits, or No to use your custom contribution amount, subject to those limits.

4. Expected Rate of Return: Enter your estimated annual investment return, such as 6%.

5. Current Age: Enter your current age.

6. Retirement Age: Enter the age when you plan to retire.

7. Marginal Tax Rate: Enter your estimated tax rate to compare your Roth IRA with a taxable investment account.

8. Calculate: Click Calculate to see your projected retirement balance.

Understanding Your Results

The calculator displays the following results:

You can also view the Yearly Schedule, Balance Breakdown, and Roth IRA Growth Over Time to understand how your savings may change before retirement.

Roth IRA Calculator Formula

The Roth IRA growth calculator uses compound interest to estimate how your existing savings and future contributions may grow.

Compound Interest Formula

For a fixed annual contribution, the future value formula is:

$FV=P(1+r)^n+C\left(\frac{(1+r)^n-1}{r}\right)$

Where:

• FV = Future Roth IRA balance

• P = Current account balance

• C = Annual contribution

• r = Expected annual return (decimal)

• n = Number of years until retirement

When annual contributions change because of age-based limits, the calculator projects each year separately.

$B_{t+1}=B_t(1+r)+C_t$

Where:

• Bₜ = Account balance at the beginning of the year

• Cₜ = Contribution for that year, subject to the applicable age-based limit

This approach allows the calculator to apply different contribution amounts before and after age 50.

Total Principal and Roth Interest

$\text{Total Principal}=P+\sum_{t=1}^{n}C_t$

$\text{Roth Interest}=FV-\text{Total Principal}$

These calculations assume a constant annual return and end-of-year contributions. Actual investment returns will vary.

Roth IRA Calculation Example

Suppose you're 25 years old and plan to retire at age 65.

Your investment details are:

Step 1: Calculate the investment period

$65-25=40\text{ years}$

Step 2: Apply age-based contribution limits

The calculator uses the 2026 contribution limits throughout the projection.

Including the initial $20,000 balance:

$\text{Total Principal}=20000+316500$

$\text{Total Principal} = \$336{,}500$

Step 3: Review the projected results

Result Explanation

With an initial balance of $20,000 and consistent contributions, your Roth IRA could grow to approximately $1.39 million by age 65, assuming a 6% annual return.

Of that amount, $336,500 comes from your starting balance and contributions, while approximately $1.06 million represents investment growth.

The calculator also estimates a Roth IRA advantage of $450,115.49 compared with its simplified taxable account scenario.

These are projected values, not guaranteed returns or actual tax savings.

Roth IRA Contribution Limits for 2026

The IRS sets annual contribution limits for Roth and Traditional IRAs.

For 2026, the limits are:

The additional $1,100 available at age 50 or older is called a catch-up contribution.

How Does the Calculator Apply These Limits?

The calculator adjusts projected contributions based on your age.

For example, if you're 30 and enter an annual contribution of $8,600:

• From ages 30–49, the calculator uses a maximum of $7,500 annually.

• Beginning at age 50, it allows up to $8,600 annually.

• These 2026 limits remain constant throughout the projection.

When you select Maximize Contributions = Yes, the calculator uses the applicable age-based maximum for each projected year.

Important: The calculator does not determine your personal Roth IRA eligibility. Your actual contribution limit may be lower depending on your taxable compensation, modified adjusted gross income (MAGI), and contributions to other IRAs.

Roth IRA Income Limits for 2026

Your ability to contribute directly to a Roth IRA also depends on your income and filing status.

If your income falls within the applicable phase-out range, your allowed contribution may be reduced.

For official information, visit the IRS 2026 retirement contribution limits.

Roth IRA vs. Taxable Investment Account

A Roth IRA and a taxable brokerage account can both help you build long-term savings, but they have different tax rules.

A Roth IRA may provide greater after-tax retirement savings because qualified withdrawals are tax-free.

However, the calculator's taxable account comparison is a simplified estimate. Actual taxes depend on investment types, dividends, capital gains, holding periods, and applicable tax rates.

Tips to Grow Your Roth IRA Savings

• Start early: More time allows your investments to benefit from compounding.

• Contribute regularly: Consistent annual contributions can increase your retirement balance.

• Use catch-up contributions: Consider the higher contribution limit once you reach age 50.

• Compare different returns: Test multiple investment return assumptions to understand possible outcomes.

• Review your investment strategy: Choose investments that match your retirement goals and risk tolerance.

• Check IRS limits annually: Contribution limits and income eligibility rules may change.

Conclusion

Our Roth IRA Calculator helps you estimate retirement savings, understand compound investment growth, and compare the potential tax benefits of a Roth IRA.

Enter your current savings, annual contribution, and retirement goals to see how your investments may grow over time.

Disclaimer: This calculator provides educational estimates and does not offer personalized financial, investment, or tax advice. Actual Roth IRA eligibility and contribution limits depend on IRS rules and your financial circumstances.