"It only cost $20 back then." But how much is that really, now? Slide through time and watch inflation reveal the true value — based on US CPI.
Inflation is measured by the Consumer Price Index (CPI) — a basket of everyday goods and services tracked over time. To convert past money into today's value, you multiply by the ratio of today's CPI to the CPI of that year. This tool uses US CPI-U annual averages. Values between reference years are interpolated, so figures are close estimates rather than official numbers.