What $100 from past decades buys in 2025
Run the calculator on $100 from a handful of start years and the pattern jumps out. Prices rose fastest in the 1970s. From 2020 to 2025 prices rose 24.4%, close to nine years of normal 2.5% inflation packed into five.
| Start year | Value in 2025 | Average yearly inflation to 2025 |
|---|---|---|
| 1950 | $1,335.86 | 3.52% |
| 1970 | $829.75 | 3.92% |
| 1980 | $390.71 | 3.07% |
| 1990 | $246.32 | 2.61% |
| 2000 | $186.96 | 2.53% |
| 2010 | $147.64 | 2.63% |
| 2020 | $124.39 | 4.46% |
Read the last row twice. A salary of $60,000 in 2020 needed to reach about $74,600 by 2025 to buy the same groceries, rent, and fuel. Anyone whose pay rose 10% over those five years took a real pay cut of roughly 12%.
The math behind each mode
Past years
The Consumer Price Index tracks the price of a fixed basket of goods for urban US households. The ratio between two years of the index is the whole answer:
value in target year = amount × CPI(target) ÷ CPI(start)
$1,000 × 321.943 ÷ 172.2 = $1,869.59The average yearly rate comes from the same ratio, taken to the power of one over the number of years. For 2000 to 2025 the result is 2.53%, even though single years swung from -0.4% in 2009 to 8.0% in 2022.
Future projection
No index exists for years still ahead, so projection mode compounds one rate you choose:
future price = amount × (1 + rate)^years
cash buying power = amount ÷ (1 + rate)^yearsBoth numbers describe the same event from two sides. The first tells you what a car, a tuition bill, or a monthly budget will cost later. The second tells you what money sitting in a zero-interest account will still buy.
Choosing a rate for projections
- 2.0% is the Federal Reserve target. Treat 2% as a floor, since the US has spent long stretches above target and few below.
- 2.5% matches the 2000 to 2025 average, which already includes the 2008 slump and the 2021 to 2023 spike.
- 3.2% is the 1913 to 2025 average. Good for retirement plans of 30 years or more, where one bad decade weighs heavily.
- 5% and above works as a stress test. Prices for college tuition and health care have run well above the overall CPI for decades, so a budget for those costs deserves a higher rate than a budget for groceries.
A quick sanity check: divide 72 by the rate to estimate how many years prices take to double. At 3%, about 24 years. At 6%, about 12.
Where the CPI answer misleads you
- Your basket is not the average basket. CPI-U weights housing near a third of spending. A renter in a tight city market, or a retiree with heavy medical costs, lives with a higher rate than the headline.
- Annual averages smooth out the year. A price from December 2021 converts with the 2021 average, which sits below the December level. For month-level precision, use the BLS monthly series instead.
- US data only. The figures here describe US urban prices. A conversion for pounds, euros, or rupees needs the index for the matching country.
- Quality changes are not visible. A $3,000 computer from 1995 converts to about $6,340 in 2025 dollars, though no buyer would trade a modern laptop for one. Inflation math compares price levels, not what the money bought.
- 2026 is a placeholder, not an official figure. BLS publishes the 2026 annual average in January 2027. Until then the page uses 332.889, the 2025 average of 321.943 raised by the 3.4% year-over-year change in the August 2026 index (334.980). Expect the final number to land a little different.