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Free Investment Return Calculators (2026)

Q: What is a realistic investment return to expect?

Historically, the S&P 500 has returned about 10% nominal and about 7% after inflation over long periods. A balanced 60/40 portfolio has returned roughly 7% to 8%. Bonds currently yield about 4.5%. For planning, 6% to 8% is a reasonable long-term assumption, and being conservative is safer.

Q: What is the difference between ROI and CAGR?

ROI is total growth divided by the amount invested, expressed as a percentage, and it ignores time. CAGR, the compound annual growth rate, is the single annual rate that grows a starting value into an ending value, so it can be compared across different periods. Use ROI for simple comparisons and CAGR for anything involving time.

Q: How do index funds work?

An index fund holds the same investments as a market index, like the S&P 500, in the same proportions. It is passively managed, so costs stay near 0.03% to 0.15%. By holding hundreds of stocks, it diversifies away single-company risk and historically outperforms most active managers over long periods.

Q: What is the average stock market return over 10 years?

Rolling 10-year US stock market returns have averaged roughly 10% nominal, with a wide range depending on the starting point. Some 10-year windows returned 15% or more, and rare ones were negative. Longer horizons produce more consistent results, which is why stocks suit money you will not need for a decade.

Q: How do investment fees affect my returns?

Fees compound against you. On $100,000 at 7% over 30 years, a 1% fee costs roughly $139,000 compared with a 0.03% fee. Every 0.1% of annual fee reduces your final balance by about 2.5% over 30 years. Low-cost index funds are the default choice for exactly this reason.

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Investment returns are expressed three ways, and confusing them causes bad decisions. Nominal return is the raw percentage change. Real return subtracts inflation, so a 10% nominal return with 3% inflation is about a 7% real return. CAGR, the compound annual growth rate, is the single rate that would grow your starting value into your ending value, which is the honest way to compare investments over time. The investment return calculator on this page reports all three so you see what your money will actually be worth in purchasing power.

Asset Class Performance Comparison (2026 Historical Data)

Asset class	10-year average return	Risk level
US large cap (S&P 500)	12.6%	Medium-high
US total market	12.1%	Medium-high
International stocks	6.8%	Medium-high
US bonds (AGG)	1.8%	Low-medium
Real estate (REITs)	8.4%	Medium
Gold	8.1%	Medium
Cash (high-yield savings)	4.5% (current)	Very low

Past performance does not guarantee future results, but the ordering is consistent over long periods: stocks grow the most with the most volatility, bonds smooth the ride, and cash preserves value.

The Fee Effect: How Expense Ratios Destroy Returns

Fees compound against you exactly as returns compound for you. On a $100,000 portfolio earning 7% over 30 years, a 0.03% expense ratio leaves about $756,000, while a 1% ratio leaves about $617,000. The difference is roughly $139,000, almost entirely fees on fees. Every 0.1% of annual fee costs about 2.5% of your final balance over 30 years. This is the strongest argument for low-cost index funds, which is why they are the default recommendation throughout this guide.

Dollar Cost Averaging vs Lump Sum Investing

Dollar cost averaging invests a fixed amount on a regular schedule regardless of price. Lump sum invests everything available immediately. Historical research shows lump sum wins about two-thirds of the time in rising markets because markets trend upward. But lump sum requires tolerating immediate drawdowns, which is where dollar cost averaging earns its keep: it removes market timing risk and makes investing automatic. Most people already dollar cost average through 401(k) paycheck contributions, and that habit beats any strategy you abandon.

How to Build a Simple Investment Portfolio in 2026

A strong starter portfolio needs three decisions: the account, the asset mix and the fund. Use a Roth IRA or 401(k) for tax advantages. Set an allocation of broad index funds, commonly 60% to 100% stocks depending on time horizon, with bonds for stability. Choose total market funds with expense ratios under 0.15%. Rebalance once a year back to your target, ignore short-term noise, and increase contributions with raises. The investment return calculator lets you model the portfolio before you fund it.