$100 in 1978 is worth $536 today
$100 in January 1978 had the same buying power as $536 in Aug 2026. Prices have risen 436% since then. Change the amount or the months below.
US CPI data through Aug 2026, updated monthly. How we calculate$100 in Jan 1978 is worth, in Aug 2026
Prices rose 436.0% in total, about 3.52% a year. Cash kept under the mattress since Jan 1978 now buys only 19% of what it used to.
US Consumer Price Index (CPI-U, all items, not seasonally adjusted), Bureau of Labor Statistics. Data through Aug 2026. Oct 2025 was not published and is estimated from the months around it.
What $100 from 1978 is worth now
Prices in the US have risen 436% since 1978, so it takes $536 today to buy what $100 bought then. Put the other way, $100 kept in cash since 1978 now buys only 19% of what it did.
That is an average of 3.5% a year over 49 years. This period includes the high inflation of the 1970s and early 1980s, when prices rose over 10% in some years.
For contrast, $100 put into the S&P 500 in January 1978, with dividends reinvested, would be worth about $29,206 today, 54× what inflation alone requires. Cash loses buying power; invested money has historically outgrown it.
| Year | Same buying power |
|---|---|
| 1978 | $100 |
| 1980 | $124 |
| 1990 | $204 |
| 2000 | $270 |
| 2010 | $347 |
| 2020 | $413 |
| Aug 2026 | $536 |
CPI in January of each year; the last row uses the latest month.
Other years
Common questions
How much is $100 from 1978 worth today?
About $536 in Aug 2026 dollars, based on the US Consumer Price Index (CPI-U) from January 1978.
How much have prices gone up since 1978?
436% in total, or about 3.5% a year on average.
What would $100 in 1978 buy today?
It buys about 19% of what it bought in 1978. You would need $536 to buy the same things.
How is this calculated?
Today's value = $100 × (latest CPI ÷ CPI in January 1978). CPI is the Bureau of Labor Statistics measure of the prices US households pay.
Based on the US Consumer Price Index for All Urban Consumers (CPI-U), all items, from the Bureau of Labor Statistics. Individual prices, such as homes, college or healthcare, rose faster or slower than the average.
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