Visualize the power of compound growth.
Use this free investment calculator to estimate the future value of your portfolio. By inputting your starting balance, recurring contributions, and expected rate of return, you can see how your wealth grows over time. If you're investing specifically for retirement, the retirement calculator adds Social Security, withdrawal planning, and a gap analysis on top of these projections.
Investment Returns
Project your portfolio growth based on market returns.
| Year | Contribution | Profit | Total Balance |
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How Investment Growth Works
The key to building wealth is the combination of regular contributions and compound returns. When your investment earns a return (like interest or stock appreciation), that return gets added to your principal. In the following year, you earn returns on your original money plus the returns from the previous year.
Key Factors
- Time Horizon: The longer your money stays invested, the more powerful the compounding effect becomes.
- Rate of Return: The annual percentage growth of your investment. Historically, the stock market (S&P 500) has returned about 10% annually on average, though it fluctuates year to year.
- Frequency: Contributing monthly helps smooth out market volatility (dollar-cost averaging) compared to lump-sum annual contributions.
How to Use the Investment Calculator
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Enter your starting balance
Type in the amount you have invested today. If you're starting from zero, enter $0 and rely on the contribution field to show how regular savings grow over time.
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Set your monthly contribution
Enter how much you plan to add each month. This is where most of the long-term growth comes from — consistent monthly investing matters more than picking a perfect starting amount.
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Choose an expected rate of return
For a diversified stock portfolio, 7% to 10% is a common benchmark. For more conservative mixes (bonds, CDs, money market), use 3% to 5%. To see your results in today's dollars, subtract 2% to 3% for inflation.
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Pick your time horizon
Enter the number of years you plan to invest. Even small differences matter: 30 years of compounding produces dramatically more than 20 years, because the largest growth happens in the final decade.
Where Should You Park Your Money?
The right home for your money depends on when you'll need it. Money you might need in the next year or two doesn't belong in the stock market — the swings are too large. Money you won't touch for a decade or more is wasted in cash. Most people need a mix:
Best for short-term money (under 5 years)
- High-yield savings accounts — FDIC-insured, fully liquid, currently around 4% to 5% APY
- Money market accounts — similar to HYSAs with check-writing privileges
- CDs and CD ladders — lock in higher rates, low risk, but less liquid
- Treasury bills — backed by the U.S. government, exempt from state tax
Best for long-term money (10+ years)
- Diversified stock index funds (S&P 500, total market) — historically ~10% annual return
- Target-date retirement funds — auto-rebalance from stocks to bonds as you age
- 401(k) and IRA accounts — tax-advantaged wrappers around the above investments
- Roth IRA — tax-free growth and withdrawals in retirement
The general rule: short-term money goes in safe, liquid accounts (compare today's savings rates to find a good one); long-term money goes in diversified investments. The boring middle ground — money you might need in 3 to 7 years — is the trickiest. A mix of bonds and conservative stock funds usually fits best.
Frequently Asked Questions
What is a good rate of return?
For long-term stock market investments, many experts use 7% to 10% as a benchmark (before inflation). For safer investments like bonds or CDs, rates are typically lower, often between 3% and 5%. The S&P 500 has averaged about 10% annual returns historically, though individual years range from -37% to +38%.
Does this include inflation?
No, this calculator shows the nominal future value of your money. To understand the purchasing power (real value), subtract the expected inflation rate (historically around 2% to 3%) from your rate of return. For example, if you expect 8% returns and 3% inflation, enter 5% to see results in today's dollars.
Are investment returns guaranteed?
No. Unlike savings accounts or CDs which have FDIC insurance up to $250,000, investments in stocks, mutual funds, and ETFs carry risk. You could lose money, and past performance does not guarantee future results. The 10% historical S&P 500 return is an average over decades — any given year can be sharply negative.
How much should I invest each month?
Most financial planners suggest investing 15% to 20% of your gross income for long-term goals like retirement, on top of any employer 401(k) match. If that's not feasible right now, start with whatever you can — even $50 a month invested for 30 years at 8% returns grows to roughly $75,000.
Should I invest a lump sum or contribute monthly?
If you have cash sitting on the sidelines, research consistently shows that lump-sum investing beats dollar-cost averaging about two-thirds of the time, because markets trend up over time. However, monthly contributions are easier psychologically and reduce the regret of investing right before a downturn. The best plan is usually whichever one you'll stick with.
What's the difference between an index fund and an individual stock?
An index fund holds hundreds or thousands of companies in a single fund (an S&P 500 fund holds all 500). It diversifies away the risk of any single company failing. An individual stock is a bet on one company. For most long-term investors, low-cost index funds are the simpler and safer choice — about 90% of professional fund managers fail to beat the index over 15 years.
How do taxes affect my investment returns?
Returns in a regular taxable brokerage account get hit with capital gains taxes (15% to 20% federal for most people, plus state). Returns inside an IRA or 401(k) grow tax-deferred, and Roth accounts grow completely tax-free. The order of operations most planners suggest: capture the full 401(k) employer match first, then max out a Roth IRA, then return to the 401(k), then use a taxable brokerage for anything beyond that.
What's a reasonable expense ratio for an index fund?
Look for index funds with expense ratios under 0.20%, ideally under 0.10%. Several major brokerages now offer total-market index funds at 0.03% or even 0.00%. A 1% expense ratio sounds small but compounds to roughly 25% less wealth over 30 years compared to a 0.05% fund — fees matter enormously over long time horizons.
