Your Roth IRA balance depends on how much you contribute, how long you leave it invested, and what return your investments earn

There is no single answer to what your Roth IRA will be worth because the outcome depends entirely on three things you control or choose: how much money you put in each year, how many years you let it sit, and what you invest it in. A Roth IRA earning 5 percent annually will grow differently than one earning 8 percent. A $3,000 contribution grows differently than a $7,000 contribution. The math is straightforward, but the variables are yours to set.

This guide shows you how to think through the calculation yourself, what assumptions matter most, and where to find tools that do the math for you. It does not predict what the stock market will do or what your specific investments will return — nobody can.

Key Takeaways

  • Your final balance is the result of three things: total contributions, years of growth, and the annual return rate of your investments.
  • A $7,000 annual contribution invested for 30 years at a 7 percent average return grows to roughly $840,000, but this is an example, not a prediction.
  • The longer your money sits untouched, the more compound growth does the work for you — the last 10 years of a 30-year investment often produce more growth than the first 10 years.
  • Your actual return depends on what you invest in: money market funds return less than stock index funds, which return less than individual stocks, and all carry different risk.
  • Online calculators let you plug in your own numbers and see different scenarios, which is more useful than any single forecast.

How the three variables work together

Start with annual contribution. The IRS sets a limit on how much you can add to a Roth IRA each year. For 2024, that limit is $7,000 if you are under 50, and $8,000 if you are 50 or older. You do not have to contribute the maximum — you can put in $2,000, $4,000, or any amount up to the limit. The more you contribute each year, the larger your ending balance will be.

Next is time. A Roth IRA opened at age 25 and left untouched until age 65 has 40 years to grow. One opened at age 45 has 20 years. The longer the time horizon, the more opportunity for compound growth — meaning your money earns returns, and those returns earn returns on top of themselves. This effect accelerates in later years. In a 30-year investment, the growth in years 25 through 30 often exceeds the growth in years 1 through 10.

Third is the annual return rate. This is where uncertainty lives. If you invest your Roth IRA in a high-yield savings account earning 4 percent annually, your balance grows slowly. If you invest in a stock index fund that averages 8 percent annually over the long term, it grows much faster. Historical stock market returns average around 10 percent annually over very long periods, but individual years vary wildly — some years are up 20 percent, others are down 15 percent. You choose what to invest in, and that choice shapes your outcome.

A concrete example: $7,000 per year for 30 years

Assume you contribute $7,000 every year for 30 years and your investments return an average of 7 percent annually. Your total contributions are $210,000. The growth on top of those contributions — the compound returns — add roughly $630,000. Your ending balance is around $840,000.

Now change one variable. If your investments return 5 percent instead of 7 percent, your ending balance drops to roughly $600,000. If they return 9 percent, it rises to roughly $1,200,000. A 2 percent difference in annual return produces a $600,000 difference in the final balance. This is why the choice of what to invest in matters so much.

Change the contribution instead. If you contribute $3,500 per year instead of $7,000, your ending balance at 7 percent return is roughly $420,000 — half as much. If you contribute $10,000 per year (which exceeds the legal limit, but illustrates the math), your ending balance is roughly $1,200,000.

Change the time horizon. If you invest for 20 years instead of 30 at $7,000 per year and 7 percent return, your ending balance is roughly $320,000. If you invest for 40 years, it is roughly $1,500,000. The extra 10 years nearly doubles the outcome.

Why compound growth accelerates over time

In year one, you contribute $7,000 and earn 7 percent on it — $490 in growth. In year two, you contribute another $7,000 and earn 7 percent on the total balance of roughly $14,490 — $1,014 in growth. By year 10, you are earning 7 percent on a balance of roughly $90,000 — $6,300 in growth that year alone. By year 30, you are earning 7 percent on a balance of roughly $840,000 — $58,800 in growth that year alone.

This acceleration is the reason starting early matters so much. A person who starts at 25 and invests for 40 years ends up with far more than a person who starts at 35 and invests for 30 years, even if both contribute the same amount each year. The extra 10 years of compound growth in the early account produces outsized returns.

What return rate should you assume

This is the hardest part because it depends on what you invest in, and past performance does not may provide future results. Here are rough historical averages, not predictions: a diversified stock index fund has averaged around 10 percent annually over the past 50 years, though individual decades vary widely. A bond index fund has averaged around 5 to 6 percent. A money market fund or high-yield savings account currently earns 4 to 5 percent. A mix of stocks and bonds — say 70 percent stocks and 30 percent bonds — might average 7 to 8 percent.

Many financial planners use 7 percent as a conservative long-term assumption for a balanced portfolio, meaning stocks and bonds mixed together. Some use 6 percent to be extra cautious. Using a lower number is safer because it sets expectations lower; if your actual return is higher, you end up pleasantly surprised.

Do not assume you will pick individual stocks that beat the market. Most professional investors do not beat the market over long periods. A low-cost index fund that tracks the entire stock market is simpler and historically more reliable than trying to pick winners.

Using online calculators to test your own numbers

Rather than memorizing formulas, use a Roth IRA calculator. The Vanguard website, Fidelity website, and Schwab website all offer free calculators where you enter your contribution amount, years until retirement, and assumed return rate, and the calculator shows you the ending balance. You can run multiple scenarios — what if I contribute $5,000 instead of $7,000, or what if returns are 6 percent instead of 8 percent — and see how each choice affects the outcome.

The SEC website also hosts a compound interest calculator that works for any investment account. These tools are more useful than any single forecast because they let you explore the range of possibilities based on your own assumptions and choices.

Why your actual balance may differ from any projection

Market returns are not smooth. Some years your balance will jump 15 percent or more. Other years it will drop 10 percent or more. If you retire in a down year, your balance will be lower than a projection assumed. If you retire in an up year, it will be higher. This is called sequence-of-returns risk, and it is one reason people often keep some money in bonds or cash — to cushion the impact of a bad year early in retirement.

You may also contribute more or less than you plan. A job loss, medical emergency, or windfall can change how much you put in each year. You may change what you invest in — moving from stocks to bonds as you age, or shifting between funds. You may withdraw money before retirement for a first-home purchase (Roth IRAs allow this under certain rules) or for other reasons. Any of these changes alters the final balance.

Frequently Asked Questions

How much should I assume my Roth IRA will return each year?

If you invest in a diversified stock index fund, historical averages suggest 8 to 10 percent annually over very long periods, though individual years vary widely. Many planners use 7 percent as a conservative assumption. If you invest in bonds or a mix of stocks and bonds, assume 5 to 7 percent. Use a lower number if you want to be cautious — it is better to plan for less growth and be pleasantly surprised.

Does the order of returns matter if I am investing for 30 years?

Yes. If you experience large losses early in your investment period, you have time to recover. If you experience large losses late in your investment period, you have less time to bounce back. This is why many people shift toward bonds and cash as they approach retirement — to reduce the risk of a major loss in the final years.

What if I start late — can I still build a meaningful balance?

Yes, but the balance will be smaller than if you started earlier. Someone who starts at 45 with 20 years until retirement and contributes $7,000 per year at 7 percent return will have roughly $320,000. That is less than someone who started at 25, but it is still substantial. Starting late is better than not starting at all.

Should I use a calculator or hire someone to project my balance?

A free online calculator is sufficient for understanding the range of possibilities. You plug in your own numbers and see multiple scenarios. A financial advisor can provide more detailed planning that accounts for taxes, Social Security, and other income sources, but for a basic projection of what your Roth IRA balance could be, the math is straightforward enough to do yourself.