$100 in 1984 has the buying power of $324.29 in September 2026. Prices are 224.3% higher, an average of 2.83% a year, by the official Consumer Price Index (CPI-U): 1984's average index was 103.9 and September 2026's is 336.940. Put the other way, $100 in September 2026 buys what $30.84 did in 1984.
Inflation in 1984 was 4.3% (the change in the year's average CPI from 1983; December to December, 3.9%), the 30th highest of the 112 years since 1914.
| Year | Average CPI-U | Inflation | $100 then is worth today |
|---|---|---|---|
| 1979 | 72.6 | +11.3% | $464.10 |
| 1980 | 82.4 | +13.5% | $408.91 |
| 1981 | 90.9 | +10.3% | $370.67 |
| 1982 | 96.5 | +6.2% | $349.16 |
| 1983 | 99.6 | +3.2% | $338.29 |
| 1984 | 103.9 | +4.3% | $324.29 |
| 1985 | 107.6 | +3.6% | $313.14 |
| 1986 | 109.6 | +1.9% | $307.43 |
| 1987 | 113.6 | +3.6% | $296.60 |
| 1988 | 118.3 | +4.1% | $284.82 |
| 1989 | 124.0 | +4.8% | $271.73 |
2.83% a year, compounded from the middle of 1984 to September 2026: prices are 224.3% higher in all, so a dollar from 1984 is worth $3.24 today.
The Bureau of Labor Statistics' Consumer Price Index for All Urban Consumers (CPI-U), all items, U.S. city average, not seasonally adjusted, which runs back to January 1913. A year's figure is the average of its monthly indexes, as BLS computes annual averages; today's figure is the latest month, September 2026, so the answer moves each month when BLS publishes a new CPI.
1983 · Inflation calculator, any month since 1913 · 1985
Source: BLS CPI-U, all items, U.S. city average, not seasonally adjusted (FRED CPIAUCNS); through 2006, BLS's official annual averages. The answer moves each month, when BLS publishes a new CPI.