The U.S. stock market's average annual return is one of the most cited and most misunderstood numbers in personal finance. The S&P 500 has returned approximately 10% per year in nominal terms over its long history — but that "average" hides enormous variation. Individual years have ranged from +38% to −38%. Any specific decade you pick may differ substantially from the long-run mean.
The calculator above runs the math for your specific amount and time horizon using those historical averages. The two rates — nominal (10%) and real/inflation-adjusted (7%) — show what your investment would be worth in raw dollars vs. in today's purchasing power. Thirty years at 10% turns $10,000 into $174,494; after adjusting for ~3% annual inflation, that $174,494 buys about what $76,000 does today.
What "average" means for stock market returns — and what it hides
The 10% long-run average is a geometric mean (CAGR) of the S&P 500 total return, calculated over rolling 30-year periods going back to the early 20th century. It is not the average of annual returns — it is the constant annual rate that produces the actual long-run outcome. This distinction matters: in volatile markets, the geometric mean is always lower than the arithmetic mean.
More importantly, that 10% average hides the starting-date problem. A 30-year period beginning in 1980 (the onset of a great bull market) produced far higher returns than a 30-year period beginning in 1966 (entering stagflation). Your specific 30-year window depends entirely on when you start investing — and no one knows in advance whether they are entering a favorable or unfavorable sequence.
Best and worst decades in U.S. stock market history
The 1990s were exceptional: the S&P 500 returned approximately 18% per year annualized, driven by the technology boom. The 2000s were the "lost decade": the S&P 500 produced a slightly negative return over the entire decade, including the dot-com crash (−49% from 2000–2002) and the financial crisis (−57% from 2007–2009). The 2010s recovered strongly at roughly 13% per year annualized.
These decade-level swings explain why financial planners use 6–7% as a conservative real-return assumption for retirement projections rather than the full historical average. A plan that works at 7% real return works in bad decades; a plan that requires 10% real return may fail in an unfavorable sequence.
Using the average return for financial planning
Financial planners use the historical average as a starting point, then apply a haircut for prudence. Common planning assumptions: 7% nominal for a diversified stock/bond portfolio (roughly 60/40), 10% nominal for 100% U.S. equity, and 4–5% for a bond-heavy portfolio. The choice depends on your risk tolerance and time horizon.
The most important variable is your time horizon. Over 1–3 years, stock market returns are highly unpredictable. Over 10 years, most long-run periods in U.S. history were positive, but there are exceptions (notably 2000–2010). Over 30 years, the U.S. stock market has never produced a negative real return in recorded history — though this does not guarantee it cannot happen.
Frequently asked questions
What has been the average stock market return over 30 years?
The S&P 500 has returned approximately 10% per year (nominal) over most rolling 30-year periods in its history, with some periods returning 8–12% depending on the start date. After inflation, the real annualized return has been closer to 7%. These figures assume dividends were reinvested. No specific 30-year window is guaranteed to match the historical average.
What is the stock market return in the last 10 years?
The S&P 500 returned approximately 12–13% per year annualized over the decade ending in 2024, well above the long-run average. This exceptional performance was driven by a broad economic expansion, low interest rates for much of the period, and strong technology sector growth. This above-average decade is one reason many forecasters expect the next 10 years to be more moderate.
Is 7% a safe assumption for stock market returns?
7% nominal is a conservative planning assumption for U.S. equity; 7% real (after inflation) is the historical average that has held over long periods. For diversified portfolios with bonds, 5–6% nominal is more appropriate. For retirement planning purposes, using 6–7% nominal (or 4% real) builds in a meaningful buffer against below-average sequences. Higher assumptions require larger portfolio margins of safety.
Does the stock market return include dividends?
The widely cited 10% long-run average is a total return figure that includes dividends reinvested. The price-only return (no dividends) is approximately 6–7% per year. Because dividends have historically represented 3–4 percentage points of the total return, reinvesting them is critical for achieving the long-run average. ETFs and mutual funds that track the S&P 500 automatically reinvest dividends in their total return figures.