Roth IRA Calculator

What is a Roth IRA Calculator?

A Roth IRA calculator projects the future value of your retirement account by compounding your current balance and annual contributions at an estimated rate of return — showing your projected balance, total contributions, and how much of the account is pure tax-free growth.

What makes a Roth IRA different from a traditional IRA or 401(k) is when you pay taxes. Roth contributions are made with after-tax dollars, so there is no deduction today. In exchange, the money grows tax-free, and qualified withdrawals in retirement — including decades of earnings — are completely tax-free. A traditional account works the opposite way: contributions may be deductible now, but withdrawals are taxed as ordinary income later. Model that side with our Traditional IRA Calculator.

How to Use

1. Enter your current age and expected retirement age.
2. Input your current Roth IRA balance and planned annual contribution.
3. Provide an estimated annual rate of return.
4. Click Calculate to see your projected balance, total contributions, earnings, and tax-free growth.

The Roth IRA Growth Formula

The calculator combines two standard future-value formulas. Your existing balance compounds on its own:

FVbalance = P × (1 + r)t

and each annual contribution compounds from the year it is made:

FVcontributions = C × [((1 + r)t − 1) ÷ r]

Your projected balance is the sum of the two parts, where:

• P — current Roth IRA balance (principal)
• C — annual contribution, assumed to be deposited at the end of each year
• r — expected annual rate of return as a decimal (8% = 0.08)
• t — number of years until retirement

Contributions are treated as end-of-year deposits with annual compounding, so the projection is slightly conservative versus investing monthly — the same math as our Compound Interest Calculator.

Worked Example: $500 a Month from Age 25 to 60

Suppose you start at age 25 with a $0 balance, set aside $500 per month ($6,000 per year), and earn an average annual return of 8% until age 60. The calculator computes:

• Years of growth: 60 − 25 = 35
• Growth factor: (1.08)³⁵ ≈ 14.7853
• Future value of contributions: $6,000 × [(14.7853 − 1) ÷ 0.08] ≈ $1,033,900.82
• Total you contributed: 35 × $6,000 = $210,000
• Tax-free growth: $1,033,900.82 − $210,000 = $823,900.82

Roughly 80% of the final balance is earnings — every dollar withdrawable tax-free once withdrawals are qualified. Depositing $500 monthly rather than one annual lump sum would push the total higher, since each deposit compounds sooner. Compare the same savings in a taxable account with our Investment Calculator.

Roth IRA vs. Traditional IRA: Which Comes Out Ahead?

The answer depends almost entirely on your tax rate today versus your tax rate in retirement. Imagine you can set aside $6,000 of pre-tax income per year for 30 years, earn 7% annually, and pay 22% tax today.

• Roth IRA: you pay 22% tax first, invest $4,680 per year, and it grows tax-free to $442,076.48 of spendable money.
• Traditional IRA: you invest the full $6,000 per year pre-tax, it grows to $566,764.72, and you pay tax on every dollar withdrawn.

If your tax rate is the same at both ends, the two accounts leave you with identical after-tax income — paying 22% now or later makes no mathematical difference. A traditional IRA pulls ahead if your rate drops in retirement; a Roth wins if it rises. Real-world wrinkles like no RMDs and tax-free inheritance for heirs often tilt the scales toward the Roth. Compare both projections with our Traditional IRA Calculator and 401(k) Calculator.

Key Roth IRA Rules to Know

Income eligibility limits

Direct Roth IRA contributions phase out once your modified adjusted gross income exceeds certain thresholds, which vary by filing status and are adjusted annually for inflation. Above the top of the range, direct contributions are not allowed at all — check the current IRS figures for your tax year.

No required minimum distributions

Unlike traditional IRAs and 401(k)s, a Roth IRA has no required minimum distributions (RMDs) for the original owner. Your money can compound tax-free for as long as you live, and the account can pass to heirs, who generally must empty it within ten years but owe no income tax on qualified withdrawals.

The 5-year rule

Earnings are tax-free only if your first Roth IRA contribution was made at least five tax years ago and you are 59½ or older (or qualify for another exception). The clock starts on January 1 of the tax year of your first contribution, so opening an account early starts the timer. Your own contributions, however, can be withdrawn at any time without taxes or penalties.

The backdoor Roth

If your income is too high for direct contributions, a “backdoor Roth” — making a nondeductible traditional IRA contribution and then converting it to a Roth IRA — is a common, legal workaround.

Frequently Asked Questions