Roth IRA Growth
Calculator

Ask most people how much their Roth IRA will actually be worth by the time they retire, and you'll usually get a vague gesture toward "whatever it grows to" rather than an actual number. That's not a knowledge gap so much as a math gap — compounding is one of those concepts everyone nods along to in theory but almost nobody sits down and runs the real numbers on, mostly because doing it by hand across thirty or forty years of contributions, market swings, and reinvested growth is genuinely tedious. So the balance in most people's heads stays fuzzy: "it'll probably be fine," "I'll figure it out later," "I put money in every year, so it's growing." All true, and all far too vague to actually plan around.

This guide exists to replace that vagueness with an actual mental model. We'll walk through what makes a Roth IRA different from a Traditional IRA or a regular brokerage account, how compounding turns a modest annual contribution into something much larger over a long enough runway, why the order and timing of your contributions matters more than most people assume, what the 2026 contribution and income limits actually are, and how to think about withdrawal rules so the tax-free growth you're building today is still tax-free when you actually need it. None of this replaces a conversation with a financial advisor or your plan provider, but it should make the number your projection spits out make real sense.

What actually makes a Roth IRA different

An Individual Retirement Account, or IRA, is simply a tax-advantaged account you open yourself, outside of any employer, specifically to invest for retirement. The "Roth" designation refers to how it's taxed, and that distinction is the entire point of the account. With a Traditional IRA, you typically contribute pre-tax dollars, the money grows tax-deferred, and you pay ordinary income tax on withdrawals in retirement. With a Roth IRA, the relationship is flipped: you contribute money that's already been taxed, it grows completely tax-free inside the account, and — provided you meet a couple of straightforward conditions — you owe no tax at all when you withdraw it in retirement, not on your contributions and not on decades of accumulated growth.

That last part is the detail that makes Roth accounts worth understanding deeply rather than glossing over. A dollar of growth inside a Roth IRA is fundamentally different from a dollar of growth inside a taxable brokerage account or even a Traditional IRA, because it's a dollar you get to keep in full. Every calculation this tool runs — projected balance, total growth, total contributions — represents money that, under current rules and a qualified withdrawal, you would never have to hand a portion of back to the IRS.

Why compounding is the real engine, not your contribution

It's tempting to think of a retirement account as a simple deposit box: you put money in every year, and the total is just the sum of what you've deposited. That mental model badly undersells what's actually happening. Once money is inside the account and invested, any growth it generates itself starts generating more growth, and that snowball effect — growth building on growth, not just on your original contributions — is compounding. Early in the life of an account, compounding looks unimpressive, because there simply hasn't been much time for growth to build on itself yet. Given enough years, though, the growth portion of the balance can eventually dwarf the sum of everything you actually contributed.

This is precisely why the "Total Contributions" and "Total Growth" figures in the calculator above are shown separately rather than folded into one number. Seeing exactly how much of your projected balance came from money you actually put in, versus money the market generated on your behalf, is the clearest way to internalize why starting early carries so much more weight than most people intuitively give it credit for.

Why an early dollar is worth more than a later one

Two people can contribute the exact same total amount to a Roth IRA over their working lives and end up with meaningfully different balances, purely because of when those dollars went in. A dollar contributed at age 25 has roughly forty years to compound before a typical retirement age; the identical dollar contributed at age 45 has maybe twenty. Because compounding is exponential rather than linear, that difference in time isn't twice as valuable — depending on the assumed rate of return, it can be worth several times more.

This is the mathematical reason financial writers so often repeat some version of "start now, even with a small amount," and it isn't just a motivational line — it's a direct consequence of how exponential growth works. A modest contribution started in your twenties, left alone, frequently outperforms a much larger contribution started in your forties, simply because of the additional stretch of compounding time the earlier dollar was given.

Monthly deposits versus a single annual lump sum

How you deliver your annual contribution — spread evenly across twelve monthly deposits, or dropped in as a single lump sum early in the year — changes your outcome slightly, and it's worth understanding why. A lump sum contributed in January has the maximum possible number of months to compound that year, since the entire amount is invested and working from day one. Monthly contributions, by contrast, mean each deposit only has partial exposure to that year's growth — your January deposit gets a full year of compounding, but your December deposit gets essentially none of that calendar year's growth.

In practice, the difference between the two approaches over a full multi-decade horizon is usually smaller than people expect, and monthly contributions carry a real practical advantage: they're far easier to sustain as a habit tied to a paycheck than trying to assemble a lump sum once a year. Dollar-cost averaging through monthly deposits also smooths out the effect of buying at any single, potentially poorly timed moment in the market. This calculator lets you model either approach so you can see the actual gap for your own numbers rather than relying on a general rule of thumb.

The 2026 Roth IRA contribution limits

The IRS sets an annual dollar limit on how much you're allowed to contribute across all of your IRAs combined, Roth and Traditional together, and that limit is adjusted periodically for inflation. For the 2026 tax year, the combined annual IRA contribution limit is $7,500 for anyone under age 50. Savers who are age 50 or older by the end of the calendar year are allowed an additional "catch-up" contribution on top of that base amount, bringing their total allowable limit to $8,600 for 2026. These limits apply across all of your personal IRAs together — if you have both a Traditional and a Roth IRA, your combined contributions to both cannot exceed the single limit for your age group.

It's worth being precise about one more detail: you can never contribute more to an IRA than you actually earned in taxable compensation that year. If your earned income for the year is lower than the IRS limit — say, a student or part-time worker who earned $4,000 — your maximum allowable contribution is capped at that lower income figure, not the full IRS limit.

Income limits: who can actually contribute directly

Unlike a Traditional IRA, eligibility to contribute directly to a Roth IRA phases out entirely once your income crosses a certain threshold, based on your Modified Adjusted Gross Income, commonly abbreviated MAGI. For 2026, single filers and heads of household can make a full Roth IRA contribution if their MAGI is under $153,000, with the ability to contribute phasing out completely once MAGI reaches $168,000. For married couples filing jointly, the full-contribution threshold is a MAGI under $242,000, phasing out completely at $252,000. Between the lower and upper bounds of each range, the maximum contribution you're allowed to make is reduced proportionally rather than cut off abruptly.

This calculator does not check your income against these thresholds, since doing so accurately would require your specific MAGI and filing status, both of which involve tax details well outside the scope of a simple growth projection. If your income is near or above these ranges, it's worth confirming your actual eligibility using the IRS's published worksheets, or with a tax professional, before assuming you can contribute the full amount this tool projects.

The backdoor Roth: a workaround worth knowing about

Savers whose income exceeds the direct contribution limits aren't necessarily locked out of Roth accounts entirely. A commonly used strategy, often called a "backdoor Roth," involves contributing to a Traditional IRA — which has no income limit on contributions, only on the tax deductibility of those contributions — and then converting those funds into a Roth IRA shortly afterward. Because the contribution was made with after-tax dollars in the first place, in the simplest version of this strategy little or no additional tax is owed on the conversion itself, though the details get considerably more complicated if you already hold other pre-tax Traditional IRA balances. This is a strategy with real tax nuance attached to it, and it's generally worth discussing with a tax professional rather than executing purely off a general description like this one.

Catch-up contributions and the final stretch before retirement

The extra $1,100 catch-up allowance available to savers age 50 and older in 2026 exists specifically because it's common to have more disposable income and fewer competing financial priorities — a paid-off mortgage, kids through college — in your fifties and sixties than earlier in your career, precisely when there's also less runway left for compounding to work its usual magic. Because catch-up contributions arrive so late in the timeline, the growth they generate is naturally smaller in dollar terms than an equivalent contribution made decades earlier, but they still represent a meaningful, tax-advantaged way to accelerate a balance that may be behind where you'd like it in the final working years before retirement.

Choosing a realistic rate of return

The rate of return you assume is, by a wide margin, the single input with the biggest effect on your projected balance, and it's also the input nobody can know with certainty in advance. Broad, diversified stock market indexes have historically delivered average annual returns in roughly the high single digits to low double digits over many multi-decade periods, though any individual year — or even any individual decade — can and does deviate significantly from that long-run average in either direction. A portfolio weighted more heavily toward bonds or cash equivalents will typically show a lower, steadier historical average; a portfolio weighted more heavily toward stocks will typically show a higher average paired with considerably more year-to-year volatility along the way.

Because no one can reliably predict which specific years will be strong and which will be weak, the most useful way to use a return assumption is as a planning range rather than a single confident forecast. Try running your own numbers through this calculator at a conservative rate, a moderate rate, and a more optimistic rate, and pay attention to how wide the resulting range of outcomes actually is — that spread is a more honest picture of your likely future than any single number could be on its own.

Why "past performance" disclaimers actually matter here

Every legitimate investment platform includes some version of the disclaimer that past performance doesn't guarantee future results, and it's worth taking that seriously rather than skimming past it as boilerplate. A calculator like this one necessarily assumes a smooth, constant rate of return applied evenly across every single year of your projection, because that's the only way to produce a clean, readable number. Real markets don't behave that way — actual returns arrive as a genuinely unpredictable sequence of up years, down years, and flat years, and the specific order those returns arrive in can meaningfully affect your real-world outcome even when the long-run average ends up identical to what you modeled. Treat every projected balance here as an illustration of how compounding behaves under a given assumption, not as a promise about your actual future account value.

Qualified withdrawals and the five-year rule

The tax-free treatment that makes a Roth IRA valuable only applies to a "qualified" withdrawal, and qualifying requires meeting two separate conditions at once. First, you generally need to be at least age 59½. Second, your Roth IRA needs to satisfy what's commonly called the five-year rule, meaning at least five tax years must have passed since your very first Roth IRA contribution, regardless of which specific Roth IRA account currently holds the money. Meet both conditions, and withdrawals of both your original contributions and all the growth on top of them come out completely free of federal income tax.

Because contributions themselves were already made with after-tax money, you're generally allowed to withdraw an amount equal to your original contributions at any time, for any reason, without tax or penalty — it's specifically the earnings portion of an early or non-qualified withdrawal that can trigger both income tax and a 10% early withdrawal penalty, subject to a handful of specific exceptions the IRS outlines, such as a first-time home purchase up to a set limit.

No required minimum distributions during your lifetime

Traditional IRAs and most employer retirement plans force you to begin withdrawing a minimum amount each year once you reach a certain age, known as a Required Minimum Distribution, or RMD. Roth IRAs are a notable exception: as the original account owner, you are not required to take any distributions from a Roth IRA during your own lifetime, regardless of your age. That means a Roth IRA balance can simply keep compounding tax-free for as long as you choose to leave it invested, which is part of why some savers treat a Roth IRA not just as retirement income but as a flexible, tax-efficient asset to potentially pass on to heirs.

How inflation quietly erodes a nominal projection

A projected balance stated in raw dollars can be genuinely misleading over a multi-decade horizon, because a dollar thirty years from now simply won't buy what a dollar buys today. This is the reason the calculator above includes an optional inflation adjustment: it takes your projected nominal balance and expresses it in terms of today's purchasing power, using whatever inflation rate you assume. Seeing both numbers side by side — the raw projected balance and the same balance in today's dollars — gives a far more honest sense of what that future balance will actually be able to buy, rather than letting a large nominal number create a false sense of security.

Common mistakes people make when projecting Roth growth

Assuming a single optimistic return rate is the only outcome worth modeling. As covered above, running the numbers at more than one rate gives a far more realistic sense of the range of outcomes you might actually experience.

Assuming last year's contribution limit still applies. The IRS limit is adjusted periodically, and quietly under-contributing because you're still budgeting around an old number leaves real tax-advantaged growth on the table.

Confusing the Roth IRA contribution limit with the income phase-out range. These are two entirely separate numbers governing two different things — how much you're allowed to contribute, and whether you're eligible to contribute at all — and mixing them up can lead to either an accidental excess contribution or an unnecessarily conservative one.

Ignoring the five-year rule when planning an early retirement. Meeting the age 59½ threshold alone isn't sufficient for a fully qualified withdrawal if your account hasn't also cleared the five-year mark, which matters most for anyone who opened their first Roth IRA relatively late.

Forgetting to revisit the projection after a raise or life change. A salary increase, a new job, or a shift toward a higher contribution can all meaningfully change your trajectory — rerunning the numbers periodically keeps the projection useful rather than stale.

Building a habit around your projection

The most useful way to treat a tool like this isn't as a one-time calculation you run once and forget, but as something you revisit every year or two, updating your current balance, your contribution amount, and your age as they change. Watching the "Total Growth" figure climb relative to your "Total Contributions" over successive check-ins is a genuinely motivating way to see compounding do its work in real time, rather than something you only appreciate in the abstract, decades from now.

How this calculator's numbers work — and their limits

The figures above are calculated using standard compound growth math applied to your chosen contribution schedule, return rate, and time horizon, with monthly compounding underlying every calculation regardless of whether you contribute monthly or as an annual lump sum. It does not connect to any brokerage or payroll system, does not know your actual income or filing status for phase-out purposes, and does not account for account fees, fund expense ratios, taxes on a non-qualified withdrawal, or any specific investment's real historical performance, since all of those depend on choices this private, browser-based tool has no way of knowing. What it reliably does is apply the underlying compounding math consistently and completely, including flagging a contribution that exceeds the 2026 IRS limit for your entered age.

The most useful way to use this tool is as a planning aid: confirm your actual eligibility and limit against the IRS's published figures or a tax professional, run the projection at a few different return assumptions, and use the timeline to get a genuine feel for how much of your eventual balance will come from your own contributions versus the growth compounding generates on top of them.

Putting it all together

A Roth IRA's real advantage isn't just that it's tax-free — it's that tax-free growth, given enough years to compound, tends to produce a meaningfully larger real-world balance than the same contributions would generate in a taxable account, purely because none of the annual growth is ever quietly reduced by a tax bill along the way. Understanding how compounding actually behaves, why early contributions carry outsized weight, what the current contribution and income limits are, and how the five-year rule interacts with qualified withdrawals is the difference between a vague sense that "it's probably growing fine" and an actual number you can plan a retirement around.

Use the calculator above to run your specific numbers, compare a conservative assumption against a more optimistic one, and treat the growth timeline as a genuine planning tool — then confirm your contribution eligibility and any tax specifics with your plan provider or a tax professional before finalizing how much you actually contribute this year.