$10,000 invested in the S&P 500 in 1966
$10,000 put into an S&P 500 index fund in January 1966 would be worth about $4,322,810 by Sep 2026, with dividends reinvested. That is 10.5% a year.
Real monthly S&P 500 data, updated monthly. How we calculate$10,000 put into the S&P 500 in Jan 1966 is now worth
S&P 500 came out on top, 12.8× 10-year Treasury bonds, which reached $338,332. Just keeping up with prices needed $105,340, and both did better. It ends in Aug 2026, the latest month with data for Bonds.
Full results by asset
| Asset | Worth now | Per year | Total return | Worst drop |
|---|---|---|---|---|
| S&P 500 | $4,343,190 | 10.5% | 43,332% | −49% (Mar 2009) |
| Bonds | $338,332 | 6.0% | 3,283% | −25% (Oct 2023) |
The chart uses a log scale: equal steps up mean equal percentage gains. What each line measures: S&P 500, S&P 500 monthly average level with dividends reinvested (an index fund, before its small fee); Bonds, total return of 10-year US Treasury bonds (interest plus price changes), modelled from the monthly 10-year yield. Inflation uses the US Consumer Price Index. Monthly averages, data through Aug 2026; no fees or taxes. Past returns do not predict future returns.
The result
Over 61 years the money doubled about 8.8 times. Without reinvesting dividends it would be $821,840: dividends account for 81% of the final value.
Inflation matters over this long. $10,000 in 1966 had the buying power of about $105,340 today, so the real gain is $4,322,810 against $105,340: still 41.0× the buying power, or 6.3% a year above inflation.
It was not a smooth ride. The value fell 49% from a high around Mar 2009, during the 2008 financial crisis. Holding through it was the price of the final number.
The same $10,000 in other assets from January 1966: 10-year Treasury bonds: $338,332. Compare more assets.
| After | Year | Worth |
|---|---|---|
| 5 years | 1971 | $11,826 |
| 10 years | 1976 | $14,620 |
| 20 years | 1986 | $50,432 |
| 30 years | 1996 | $202,434 |
| 40 years | 2006 | $493,356 |
| 50 years | 2016 | $910,726 |
| 60 years | 2026 | $3,880,996 |
| Now | Sep 2026 | $4,322,810 |
Value over time, with dividends reinvested. No fees or taxes.
Try other amounts and years
Common questions
How much would $10,000 invested in the S&P 500 in 1966 be worth today?
About $4,322,810 as of Sep 2026, with dividends reinvested and no fees or taxes. Without dividends, about $821,840.
What was the average yearly return since 1966?
10.5% a year before inflation and 6.3% after inflation.
How much is $10,000 from 1966 in today's money?
About $105,340, based on US consumer prices (CPI). See inflation since 1966.
Is a lump sum better than investing monthly?
Historically a lump sum came out ahead about two-thirds of the time, because markets rise more often than they fall. Spreading it out reduces regret if a crash comes right after. Test both with the lump sum vs DCA calculator.
Based on the S&P 500 monthly average level with dividends reinvested (an index fund before its small fee). Educational estimates, not investment advice. Past returns do not predict future returns.
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