Average S&P 500 Return: What the Long-Term Data Shows
The S&P 500 has historically returned about 10% per year on average before inflation when dividends are included, or roughly 6%–7% after inflation, over long periods. The exact average depends on the start and end dates and on whether you mean a simple annual average or the compounded return an investor would actually experience.
What “average S&P return” means
The S&P 500 is a stock-market index tracking shares of 500 large U.S. companies. It is commonly used as a broad indicator of U.S. large-company stock performance, although it does not represent every U.S. business or the whole global market.
When someone asks for its average return, they may mean one of two calculations:
- Arithmetic average: Add each year’s returns and divide by the number of years. This describes the average of the annual figures but does not show the compounded growth of money over the entire period.
- Geometric average, or compound annual growth rate (CAGR): The constant annual rate that would turn the starting value into the ending value, accounting for compounding. This is generally the more useful measure for describing long-term investment growth.
Those figures can differ substantially because strong and weak years compound rather than simply cancel each other out. A statement such as “the S&P averages 10%” is therefore a rough historical shorthand, not a promise of a 10% gain in a typical year.
Price return versus total return
The index’s price return measures changes in share prices and excludes dividends. Its total return assumes dividends are reinvested. Since companies in the index pay dividends, the total return over a long period is higher than the price return.
For historical comparisons, make sure the quoted figure refers to the same kind of return. The often-cited figure near 10% is generally a long-run nominal total return, with dividends reinvested. It should not be read as the index’s price-only gain or as the return every investor receives after taxes, fees, and inflation.
Why the average changes with the time period
There is no single fixed historical average. The result changes with the chosen dates because market performance varies widely from year to year and across decades. A period that begins after a market decline can look unusually strong; one that starts near a peak may show a more modest result for a while.
For example, an investor measuring from the start of one calendar year to its end is answering a different question from someone calculating growth over several decades. A long period smooths some short-term volatility, but it does not remove market risk or guarantee a positive result over every possible holding period.
Historical averages also depend on data conventions: whether dividends are reinvested, whether returns are nominal or inflation-adjusted, and whether annual observations or exact start and end dates are used. A reliable comparison states these assumptions rather than presenting a percentage without context.
Nominal returns, inflation, and purchasing power
A nominal return is the percentage increase before adjusting for inflation. An inflation-adjusted, or real, return estimates the change in purchasing power. Over long historical periods, the S&P 500’s annualized total return is often summarized as about 10% nominal and around 6%–7% real, though both numbers vary with the period measured.
The difference matters because a dollar received decades from now may buy less than a dollar today. As a simplified illustration, if an investment earns 10% nominal while prices rise 3%, its real return is about 6.8%, not exactly 7%; the exact relationship is calculated by dividing the nominal growth factor by the inflation growth factor.
These are historical estimates, not forecasts. Future inflation and stock returns are unknown, and a real return calculation does not account for an individual investor’s taxes or costs.
How compounding affects an investment
Compounding means that gains and reinvested dividends can themselves generate returns. If an amount grows at a steady annual rate, the compound growth formula is starting value × (1 + annual rate)number of years. Actual market returns are not steady, but the formula illustrates why the annualized rate is different from the arithmetic mean of yearly returns.
As a hypothetical illustration, $10,000 growing at a constant 10% annually would become about $25,937 after 10 years before taxes and costs. This is a mathematical example, not a prediction of what an S&P 500 investment will earn. Real returns fluctuate, and the order of gains and losses can matter, particularly when money is withdrawn along the way.
Investors cannot buy an index directly. A fund that tracks it may aim to follow the index, but its actual result can differ because of expenses, tracking differences, taxes, and the timing of purchases and sales.
How to use the figure responsibly
The historical average can provide context for long-term planning, but it is not a reliable estimate of next year’s return. Stocks can fall sharply, and positive long-run averages include periods of losses. Averages also do not describe the path an investor experiences: two investments with similar annualized returns may have very different interim declines.
- Check whether the figure includes reinvested dividends.
- Check whether it is nominal or inflation-adjusted.
- Look at the measurement period and whether the rate is arithmetic or compounded.
- Remember that an index return is not necessarily an investor’s after-cost, after-tax return.
- Do not treat past performance as a guarantee of future results.
Frequently Asked Questions
What is the average annual return of the S&P 500?
The commonly cited long-run figure is about 10% a year nominally when dividends are reinvested. The precise result depends on the dates and calculation method.
Is the S&P 500 average return 10% or 7%?
Both can be reasonable shorthand for different measures. About 10% refers to a nominal total return; roughly 6%–7% is a commonly cited long-run inflation-adjusted estimate.
Does the S&P 500 average include dividends?
Not always. Price-return figures exclude dividends, while total-return figures include them, usually assuming reinvestment. Always check which measure is being quoted.
Does the S&P 500 return 10% every year?
No. Annual returns vary considerably and may be positive or negative. The long-term average summarizes a selected history; it does not describe a typical year or guarantee a future result.
What is the difference between average return and CAGR?
The arithmetic average is the sum of annual returns divided by the number of years. CAGR is the compounded annual rate linking the initial and final values, making it more informative about long-term growth.
Is the S&P 500 return after fees and taxes?
Usually, quoted index returns are not an individual investor’s net return. Fund expenses, tracking differences, taxes, and personal timing can affect what an investor actually keeps.
Related
Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.