S&P 500
since-inception calculator
What if you'd put money into the S&P 500 every single year since 1928 — through the Depression, the wars, the crashes and the booms? This runs the real annual returns, dividends reinvested, from any year you pick.
Investing through everything, since 1928
This calculator uses the real, published annual total returns of the S&P 500 and its predecessor index — dividends reinvested — for every year from 1928 through 2025. Not an average, not a smooth assumed rate: the actual sequence, including the −43.8% of 1931, the −36.6% of 2008, and the +52.6% of 1954. Pick a start year, choose a yearly contribution or a single lump sum, and it compounds your money through each year in order.
= $98,000 of your own money in
→ over a quarter of a billion dollars out, dividends reinvested.
Run it above — the exact figure is on the dial.
What "total return" means
Price charts of the index understate what an investor actually earned, because they ignore dividends. Reinvested dividends have historically supplied around 40% of the market's total gain over the last century. This tool uses total returns throughout, which is the honest basis for "what would I have."
A note on "inception"
The 500-stock index as we know it launched in 1957. Before that, its direct predecessor — the S&P Composite of 90 stocks, tracked from 1928 — carries the series back, and that spliced history is the standard one used across finance. Start the calculator at 1957 if you want the strict 500-company era; at 1928 for the full published record.
Why buying every year works
Contributing a fixed sum annually — dollar-cost averaging — means you automatically buy through crashes, when everything is cheap, and those bear-market purchases do outsized work later. Someone who kept buying through 1929–1932, or 1973–74, or 2008, was buying the fuel for the recoveries that followed. The sequence matters less than the discipline.
The honest caveats
Three things this clean arithmetic leaves out. Inflation: a 1928 dollar bought far more than a 2025 dollar, so real (inflation-adjusted) growth is meaningfully lower than the nominal figures shown — the long-run real total return is roughly 7% a year versus about 10% nominal. Costs and taxes: index funds barely existed before the 1970s, and fees, taxes and tracking error would have trimmed real-world results. Survivorship: the US market is history's best performer; not every country's index compounded like this. Past returns don't promise future ones — this is a record, not a forecast. For the mirror-image mechanics, see the compound interest calculator, and for what happens if you only ever bought the biggest company instead, the S&P 1 vs S&P 500 page tells that story.
S&P 500 since inception FAQ
You would have put in $98,000 of your own money across 98 years, and with dividends reinvested it would have compounded to roughly a quarter of a billion dollars by the end of 2025 — the earliest contributions alone grew more than 11,000-fold. Run the calculator for the exact figure — it applies each year's real return in sequence.
Yes. It uses annual total returns, which assume every dividend is reinvested. Dividends have contributed roughly 40% of the market's total gain over the past century, so price-only calculations badly understate history.
The 500-company index launched in 1957. Its history is conventionally extended back to 1928 via its predecessor, the S&P Composite of 90 stocks — that spliced series is the standard one used in finance and in this calculator.
About 10% a year with dividends reinvested over the long run — roughly 7% after inflation. The year-to-year reality is violent, from −43.8% in 1931 to +52.6% in 1954, which is why the average alone is misleading.
No — figures are nominal. A dollar in 1928 bought far more than a dollar today, so real purchasing-power growth is lower than the raw numbers. The long-run real total return is roughly 7% a year.
No. This is a historical record of one market — the most successful one in history — and includes no fees or taxes. It shows what happened, not what will happen.