Purchasing Power Today* of a US Dollar Transaction in the Past
The answer you get will use the latest value of the CPI (published July 13, 2021) compared to the CPI in the year you are interested in.
It will also point out that this may not be the best answer and that you should consider other indexes of relative worth.
*To find the relative value in an earlier year, use
Seven Ways to Compute the Relative Value of a US
Dollar Amount, 1790 - Present. At this page, you will find a more extensive discussion of how to compute relative worth with many examples. That is also the comparator we recommend to be used for used in scholarly articles as the results from this comparator will change every month, and will not be reproducible.
Samuel H. Williamson, "Purchasing Power Today of a
US Dollar Transaction in the Past," MeasuringWorth,
Please let us know if and how this discussion has assisted you in using our comparators.