Roth Ira Calculator: The Complete Guide

A Roth IRA calculator tells you exactly what your tax-free retirement account will be worth — based on what you contribute today, how long you invest, and what growth rate you assume. Put in $200 a month starting at age 25, assume a 7% annual return, and most calculators will show you a balance north of $525,000 by age 65 — all of it tax-free. The tool takes seconds to use, but the numbers it produces can reshape how you think about retirement entirely.

All rates and return assumptions mentioned in this article are for illustration purposes only. Actual investment returns vary and are never guaranteed — always verify projections with a licensed financial advisor before making decisions.

The challenge is that not every Roth IRA calculator is built the same. Some are bare-bones. Others let you model income phase-outs, catch-up contributions, Roth conversions, and even tax bracket comparisons. This guide compares the best free Roth IRA calculators available in 2026, breaks down real growth scenarios by contribution amount and age, and shows you which tool to use depending on your exact situation. If you want to understand the IRS contribution limits that cap what you can put in each year, that context matters before you run your first projection.

Contents

1. Bankrate Roth IRA Calculator: Best Overall Free Tool
2. Calculator.net Roth IRA Calculator: Best for Detailed Projections
3. Charles Schwab Roth vs. Traditional IRA Calculator: Best for Tax Comparison
4. NerdWallet Roth IRA Calculator: Best for Beginners
5. Fidelity Roth Conversion Calculator: Best for Conversion Decisions
6. Roth IRA Growth by Contribution Amount and Age: Real Numbers
7. Quick Comparison of the Best Free Roth IRA Calculators
8. Watch This First
9. What Real People Are Saying
10. How We Chose These Calculators
11. Frequently Asked Questions
12. Final Verdict

Roth IRA Calculator: Best Overall Free Tool

The Bankrate Roth IRA calculator is the most widely used free tool for a reason: it balances simplicity with enough depth to be genuinely useful. You enter your current age, the age you plan to retire, your annual contribution, and an assumed rate of return. The calculator spits out your projected balance at retirement, broken down year by year if you want to see the compounding happen in real time.

What sets apart from generic compound interest tools is that it's specifically designed for Roth IRA modeling. It accounts for contribution frequency — monthly versus annually — and shows your total contributions alongside your total growth, so you can see exactly how much of that final balance the market built versus what you put in yourself. For someone contributing $500 a month starting at 30 with a 7% assumed return, the calculator shows a balance of roughly $1.2 million by age 65. Your actual contributions over that period would be around $210,000. The rest — over $990,000 — is compounded growth. That visual alone changes how most people think about starting early.

The tool doesn't require an account or email. No paywall, no signup form. You run the numbers, adjust the inputs, and leave. That frictionless experience makes it the first recommendation for anyone doing a quick gut-check on their savings plan.

One limitation: 's calculator doesn't model income-based phase-outs, which matter if your modified adjusted gross income is approaching the Roth IRA eligibility threshold ($150,000 for single filers, $236,000 for married filing jointly in 2026). For that level of detail, the Schwab or Fidelity tools are better fits.

Pros

• Completely free, no signup required
• Year-by-year growth breakdown available
• Clean interface, mobile-friendly
• Separate view for contributions vs. Growth

Cons

• Doesn't model income-based contribution limits
• No Roth vs. Traditional comparison built in
• Assumed return is a fixed number, not range-based

Who It's For

Anyone who wants a fast, accurate projection of how their Roth IRA will grow over time — especially first-timers who just want to understand the power of compounding without getting lost in tax complexity. A 28-year-old starting with $0 who can contribute $300/month will see a projected balance near $750,000 by retirement. That number is often enough motivation to open the account the same day.

Calculator.net Roth IRA Calculator: Best for Detailed Projections

The Calculator.net Roth IRA calculator is the most feature-rich free option available without logging into a brokerage. It goes well beyond basic growth projection. You can model tax savings, estimated total return, year-by-year balance tables, and compare what your money would look like in a taxable account versus inside a Roth IRA. That tax-equivalent comparison is the tool's real differentiator — it shows you not just what you'll have, but what you'll actually keep.

The interface lets you set contributions as monthly or annual, choose a starting balance, set a retirement age, and define an assumed rate of return. But what separates it from the tool is the output. Calculator.net generates a detailed amortization-style table showing your beginning balance, annual contribution, interest earned, and ending balance for every single year between now and retirement. That granular view is valuable if you're trying to model specific milestones — like "what will my balance be at 50 when I start making catch-up contributions?"

It also shows estimated tax savings — meaning the taxes you avoid by using a Roth IRA instead of a taxable brokerage account. This isn't a perfect science (it depends on your tax rate at withdrawal), but having that figure in front of you makes the case for a Roth IRA in concrete dollar terms rather than abstract tax theory. Understanding how compound interest works mechanically helps you interpret these year-by-year tables with more confidence.

The downside: the interface looks dated, and there's no mobile optimization. On a phone, the tables can be hard to read. But for desktop users who want the most complete free Roth IRA growth calculator available, this is the one.

Pros

• Year-by-year detailed balance table — most granular free option
• Shows tax savings estimate alongside growth
• Taxable vs. Roth IRA comparison built in
• Supports starting balance input (not just $0 starts)

Cons

• Dated, clunky UI — not optimized for mobile
• No income phase-out modeling
• Tax savings estimate is approximate, not personalized

Who It's For

Spreadsheet-oriented people who want to see every year of their Roth IRA growth laid out in a table. If you already have a balance — say, $15,000 from three years of contributions — and you want to see exactly where that gets you at age 55 and 65 with different monthly contribution amounts, this calculator is more useful than any other free option. A 35-year-old with $15,000 already saved contributing $500/month at 7% sees a balance over $890,000 at 65 — and the table shows every step of that journey.

Charles Schwab Roth vs. Traditional IRA Calculator: Best for Tax Comparison

The Charles Schwab Roth vs. Traditional IRA calculator answers a fundamentally different question than the other tools on this list. Instead of asking "how much will my Roth IRA grow?", it asks "should I use a Roth IRA or a Traditional IRA at all?" That's the more important question for millions of Americans who have access to both account types.

Schwab's calculator factors in your current tax bracket, your expected tax bracket in retirement, your annual contribution, and your time horizon. It then shows you the projected after-tax value of both a Roth IRA and a Traditional IRA side by side. The results are sometimes surprising. For people who expect to be in a lower tax bracket in retirement — common for those with moderate 401(k) balances and no pension — a Traditional IRA can produce a higher after-tax balance. For younger workers in the 22% bracket today who expect to stay there or move higher, the Roth IRA typically wins.

The calculator also accounts for Required Minimum Distributions (RMDs), which kick in for Traditional IRAs starting at age 73 but don't apply to Roth IRAs during the owner's lifetime. That RMD difference is substantial for people who don't need their retirement account money right at 73 — the Roth IRA continues to compound tax-free indefinitely. Schwab's tool surfaces this trade-off clearly without requiring you to do manual math.

You don't need a Schwab account to use this tool, though Schwab clearly hopes the results will push you toward opening one. The calculator is legitimately objective — it will tell you a Traditional IRA is better if your numbers support that conclusion.

Pros

• Side-by-side Roth vs. Traditional after-tax comparison
• Accounts for RMDs in Traditional IRA modeling
• Tax bracket inputs make projections more realistic
• Free, no account required

Cons

• Requires you to estimate your retirement tax bracket — hard to know in advance
• Doesn't show year-by-year growth tables
• Less useful for pure growth projections

Who It's For

Anyone who's debating whether to use a Roth IRA or a Traditional IRA — particularly people in their 30s and 40s who have access to both and want to make a data-driven decision. A 40-year-old in the 24% bracket who expects to drop to 12% in retirement will likely find the Traditional IRA produces a better after-tax outcome. Schwab's tool shows that math clearly.

Roth IRA Calculator: Best for Beginners

The NerdWallet Roth IRA calculator is designed for people who have never used a Roth IRA calculator before. The interface is clean, the inputs are minimal, and the output is presented in plain English with a clear chart. There's no overwhelming table of numbers, no jargon-heavy footnotes. You enter three things — your current age, how much you'll contribute monthly, and when you want to retire — and you get a projected balance with a visual graph showing the growth curve over time.

What makes this tool especially useful for beginners is the way it contextualizes the result. Rather than just showing you a lump sum, shows you the breakdown between what you contributed and what you earned through investment gains. For a 25-year-old putting in $200/month until age 65 at a 6% assumed return, the tool shows approximately $399,000 in total — with about $96,000 in contributions and $303,000 in growth. Seeing that growth-to-contribution ratio visually is often more persuasive than any text explanation.

's calculator also includes a contribution limit check. If you enter a monthly amount that would push you over the annual IRS contribution limit ($7,000 in 2026, or $8,000 if you're 50 or older), it flags the issue and explains the limit. That's a genuinely useful guard rail for people who are new to IRAs and don't yet know the rules.

The trade-off is depth. The tool doesn't model starting balances beyond $0, doesn't have a Roth vs. Traditional comparison, and doesn't handle the income phase-out ranges. It's a one-question tool: "How much will my Roth IRA be worth?" If that's your question, it answers it well.

Pros

• Cleanest, most beginner-friendly interface of any free tool
• Visual growth chart included
• Automatically flags if your input exceeds IRS contribution limits
• No account or signup required

Cons

• No starting balance input — assumes $0
• No Roth vs. Traditional comparison
• No income phase-out modeling
• Fixed return assumption, not adjustable range

Who It's For

People who just opened a Roth IRA (or are seriously considering it) and want a quick, visually clear answer to "is this worth it?" A 22-year-old who just started their first real job and wants to know what $50 or $100 a month means over 40 years will get exactly the clarity they need from this tool — fast.

Fidelity Roth Conversion Calculator: Best for Conversion Decisions

The Fidelity Roth conversion calculator solves a specific problem that the other tools on this list don't touch: should you convert money from a Traditional IRA, SEP IRA, SIMPLE IRA, or 401(k) rollover into a Roth IRA? Conversion is a fundamentally different decision than regular contributions. You're paying taxes now, in exchange for tax-free growth and withdrawals later. Whether that trade makes sense depends heavily on your current tax situation, your expected retirement income, and how you'll pay the tax bill on the converted amount.

Fidelity's tool asks you to input your current account balance, your marginal tax rate, how you plan to pay the conversion tax (from the IRA itself vs. From other funds — which makes a significant difference), and your time horizon. It then shows you the projected after-tax value of converting versus keeping the money in a Traditional IRA, broken down by scenario.

One nuance Fidelity's calculator handles that most people miss: if you pay the conversion taxes out of the IRA funds themselves, you're actually reducing the invested principal, which hurts long-term growth. Paying the tax bill from outside funds (a savings account, for instance) is almost always more efficient. The calculator shows both scenarios side by side so you can see the dollar difference clearly. This is also where proper budgeting discipline matters — having cash available to cover conversion taxes without touching the IRA itself is what makes conversions truly worthwhile.

This tool does require a Fidelity account to access the full version, though a simplified version is available to non-customers. For anyone seriously considering a Roth conversion — especially in a low-income year after a job change or early retirement — this is the most important calculator to run.

Pros

• Only free tool specifically designed for Roth conversion analysis
• Models the critical difference between paying taxes from IRA vs. Outside funds
• Handles Traditional, SEP, SIMPLE, and rollover IRA conversions
• Built by a major brokerage with institutional-grade assumptions

Cons

• Full version requires a Fidelity account
• More complex — not suitable for beginners
• Focused on conversion only, not ongoing contribution growth

Who It's For

Anyone with a pre-tax retirement account — Traditional IRA, old 401(k), SEP IRA — who is evaluating whether a Roth conversion makes sense in their current tax situation. Particularly valuable for people in a transitional year: recently retired, between jobs, or a business owner with an unusually low-income year who can convert at a lower effective tax rate. A 55-year-old with $200,000 in a Traditional IRA who retires early and has two years of lower income before Social Security kicks in might convert $30,000-$40,000 per year at 12%, rather than waiting until RMDs force withdrawals at 22% or higher.

Roth IRA Growth by Contribution Amount and Age: Real Numbers

Running a Roth IRA calculator is useful. But having benchmark numbers already in front of you is faster. The table below uses a 7% annual return assumption — a commonly used long-term stock market average — to show projected balances at age 65 based on monthly contribution and starting age. These figures assume no starting balance and contributions made monthly throughout the entire period.

Monthly contribution amounts and starting ages are the two variables that matter most. Starting 10 years earlier has roughly the same impact as doubling your monthly contribution — which is why every personal finance professional emphasizes starting young over contributing large amounts later.

A few things jump out immediately. First, $100 a month in a Roth IRA for 30 years (starting at 35) produces roughly $122,000 — a meaningful sum on its own. Start that same $100/month at 22, and you end up with $349,000 — nearly three times as much, from just 13 extra years of contributions. Second, maxing out your Roth IRA at $7,000/year ($583/month) starting at 25 produces over $1.5 million by retirement — fully tax-free. That's the compounding math that makes the Roth IRA one of the most powerful accounts available to ordinary Americans.

The "$100 a month in a Roth IRA for 40 years" scenario — starting at 25 — yields roughly $262,000 at a 7% return. Many people are surprised that $100/month over 40 years "only" produces that amount. The reason: $100/month is just $1,200/year, and total contributions over 40 years would be $48,000. The market multiplies that by roughly 5.5x at 7% growth, which is the compounding engine doing its job. Increase that to $200/month and you're looking at roughly $524,000 — same time horizon, same return, just twice the input. The relationship is linear on contributions but not on time.

Quick Comparison of the Best Free Roth IRA Calculators

Watch This First

Watch: the Marriage Kids and Money YouTube channel on top retirement calculators for 2026 →

According to the Marriage Kids and Money YouTube channel, most people don't realize how dramatically their Roth IRA projections change when they use a tool that accounts for tax bracket optimization rather than a fixed assumed return. The key insight: a Roth IRA calculator that only shows you a lump-sum retirement balance is telling you half the story. The other half is what tax strategy you use to get there — because the same dollar invested through a Roth IRA versus a Traditional IRA produces a very different after-tax result depending on when you expect to be in a higher bracket. Running both scenarios side-by-side before choosing is the move most calculators don't prompt you to make.

This matters more in 2026 than it did even five years ago. Current federal tax rates, set by the Tax Cuts and Jobs Act, are scheduled to revert to higher levels after 2025 unless Congress acts. That means locking in today's rates through Roth conversions or Roth contributions — especially for people in the 22% or 24% bracket — could be worth tens of thousands of dollars in avoided taxes over a 20–30 year retirement. No standard Roth IRA calculator will model this automatically. You have to use the Schwab or Fidelity tools alongside a basic growth calculator to see the full picture.

What Real People Are Saying

The gap between what calculators show and what people actually do with that information is a recurring theme in personal finance communities. In r/personalfinance, one user described running a basic Roth IRA growth calculator and finding that $50/week over 25 years at 7% growth produces approximately $177,000. Their reaction: they hadn't realized such a small weekly commitment could build to that amount, and they set up automatic contributions the same week. That's the practical value of a good calculator — it converts an abstract savings goal into a number that feels real and achievable.

In r/personalfinance, another user asked which calculator could tell them how much they'd need to contribute per month to reach $1 million. The thread responses pointed toward Calculator.net and as the most capable free tools — specifically because they let you work backward from a target balance rather than just forward from a contribution amount. That reverse-calculation feature is something most beginners don't know to look for, but it's extremely useful once you have a specific retirement goal in mind.

Users in r/personalfinance also raised a limitation that standard calculators miss entirely: what happens when your contributions increase over time as your salary grows? A 26-year-old contributing $200/month today might reasonably expect to contribute $400/month by 35 and max out at $583/month by 40. Static calculators assume a fixed contribution forever. For more dynamic modeling, users recommended building a simple spreadsheet or using a tool like projecting savings growth in stages. The limitation is real — no free tool models contribution escalation automatically.

One thread in r/personalfinance tackled whether Roth IRA calculators are actually reliable. The consensus: they're reliable for illustration purposes, not prediction. The 7% return assumption is a long-run average that smooths over years where the market dropped 30% and years where it gained 25%. A calculator can't tell you what the market will do — but it can tell you that staying invested consistently over decades is what drives the outcome, regardless of short-term volatility.

How We Chose These Calculators

Selecting the best free Roth IRA calculators required evaluating dozens of options across major financial institutions, personal finance sites, and credit union tools. The field is crowded with low-quality clones that use outdated tax assumptions or don't disclose their calculation methodology. Our selection criteria focused on four core factors.

Accuracy of calculation methodology. Every calculator was tested against manual compound interest calculations using the standard future value formula. Tools that produced results more than 2% off from hand-calculated figures were excluded. Several bank-branded calculators (including a few community bank tools) failed this test by rounding aggressively or using annual compounding instead of monthly compounding — which understates final balances.

Depth of inputs and outputs. A basic calculator that only accepts "monthly contribution" and "years" doesn't serve the full range of people who need Roth IRA guidance. We weighted tools more heavily when they allowed starting balance inputs, tax bracket modeling, Roth vs. Traditional comparisons, and year-by-year output tables. Tools that only produce a single final number — with no breakdown — were ranked lower.

Accessibility without account creation. A surprising number of brokerage calculators require you to log in before accessing their Roth IRA projections. We prioritized tools that are fully functional without an account, on the grounds that most people searching for a free Roth IRA calculator are in the research phase — not yet customers of any specific brokerage.

Institution credibility and transparency. Calculators from major regulated institutions (, Schwab, Fidelity, ) were given preference over anonymous third-party tools, because their methodologies are more likely to be professionally reviewed and updated when IRS limits or tax brackets change. Outdated calculators using the 2021 contribution limits ($6,000) were excluded entirely.

Tools excluded from this list included several community bank and credit union calculators — such as Valley Bank and Landmark Credit Union's tools — which are functional for basic use but aren't updated consistently with current IRS limits and lack the depth to serve people with more complex situations. They're fine for a rough estimate but aren't what you should rely on for serious planning.

Frequently Asked Questions

How much will a Roth IRA grow in 20 years if I contribute $200 a month starting at age 35?

At a 7% annual return, $200/month contributed for 20 years produces approximately $104,000. Total contributions would be $48,000, meaning about $56,000 came from compounded growth. At a slightly higher 8% return, that number climbs to roughly $117,000. The growth accelerates significantly in the final five years of any 20-year period — which is why stopping contributions early is disproportionately costly.

If I put $6,000 in a Roth IRA once and never contribute again, how much will it be worth in 30 years?

A single $6,000 contribution at a 7% annual return grows to approximately $45,700 after 30 years — entirely tax-free. That's a 7.6x return on a one-time deposit. At 8%, the same $6,000 becomes roughly $60,400. This is why people who hit unexpected windfalls — a bonus, an inheritance, a tax refund — should consider maxing out their Roth IRA for the year before spending elsewhere. The compounding on even a one-time contribution is substantial.

Are these Roth IRA calculators showing permanent returns, or are the growth rates promotional?

The return rates used in Roth IRA calculators are not promotional or guaranteed — they are user-adjustable assumptions, typically set to 6% or 7% as a default. These defaults reflect long-run historical average stock market returns, not a promise from any financial institution. Actual returns in any given year may be higher, lower, or negative. The calculator projections are planning tools, not contracts. Always run multiple scenarios (5%, 7%, and 9%) to understand the range of possible outcomes.

Can I use a Roth IRA calculator to figure out if I'm eligible to contribute at my income level?

Most free Roth IRA calculators don't include income eligibility checks. For 2026, the ability to contribute to a Roth IRA phases out for single filers between $150,000 and $165,000 MAGI, and for married filing jointly between $236,000 and $246,000 MAGI. Above those limits, you cannot contribute directly — though the backdoor Roth IRA strategy remains an option. The IRS website publishes the exact phase-out ranges each year, and the Schwab Roth vs. Traditional IRA calculator is the only free tool on this list that attempts to factor income eligibility into its recommendations.

What's the difference between a Roth IRA calculator and a 401(k) calculator, and should I be using both?

A Roth IRA calculator models after-tax contributions that grow and withdraw tax-free. A 401(k) calculator typically models pre-tax contributions with taxable withdrawals in retirement. They solve different parts of the same problem. Most financial planners recommend using both — your 401(k) for the employer match first, then a Roth IRA if you're under the income limit, then back to the 401(k) for additional pre-tax savings. Running both calculators lets you see what your combined retirement picture looks like from multiple account types, which is almost always more realistic than modeling a single account in isolation.

Can a Roth IRA calculator tell me the right asset allocation inside the account?

No. A Roth IRA calculator only models the growth of whatever return rate you input — it doesn't know whether you're invested in a target-date fund, index funds, bonds, or cash. The calculator assumes you earn that 7% (or whatever rate you enter) consistently. In practice, your actual return depends entirely on what you own inside the Roth IRA. Most experts recommend broadly diversified index funds for long-term Roth IRA investing, because they closely track the overall market return that the 7% assumption is based on. The calculator is only as useful as the return assumption you give it. For a deeper look at low-cost fund options, the index funds vs. ETF comparison covers the structural differences that affect long-term Roth IRA performance.

How does the 5-year rule affect what a Roth IRA calculator shows me?

Standard Roth IRA calculators don't model the 5-year rule — and they should. To take any distribution that includes earnings tax-free, your Roth IRA must have been open for at least five tax years, and you must be at least 59½. If you open a Roth IRA at 58 and withdraw at 62, the earnings may still be subject to tax if the five-year clock hasn't run. The fix: open a Roth IRA as early as possible, even with a small contribution, to start that five-year timer. A calculator showing a large balance at 60 doesn't tell you whether that balance is actually accessible tax-free — the five-year rule is a separate check you need to verify manually.

Final Verdict

The best overall free Roth IRA calculator is Bankrate's tool — it's accurate, requires no account, shows the contribution-versus-growth breakdown clearly, and works on any device. Start there for your first projection.

If you want more depth — year-by-year tables, tax savings estimates, or a taxable account comparison — upgrade to the Calculator.net Roth IRA calculator. If you're deciding between a Roth and a Traditional IRA, Charles Schwab's comparison tool is the most rigorous free option available. And if you're evaluating a Roth conversion from a pre-tax account, Fidelity's conversion calculator is purpose-built for that specific decision.

The numbers in this guide are projections, not guarantees — but they're grounded in realistic long-term return assumptions that have held across decades of market history. The most important variable isn't which calculator you use. It's whether you start contributing today versus next year. At 7% growth, waiting one year to begin costs you roughly 7% of your entire final balance — compounded over 30 or 40 years, that one-year delay can mean $50,000 or more in missed growth. Run the numbers. Then open the account.

About the Author
Written by Varn Kutser
Personal finance writer covering savings, investing, and budgeting with a data-first approach. Every rate, limit, and claim is verified against official sources — FDIC, IRS, and Federal Reserve. No clickbait, no guesswork, just numbers.

Disclaimer: Rates and terms mentioned in this article are subject to change. Verify current rates directly with financial institutions before opening any account.

Last updated: April 22, 2026 · fabelo.io