This tool takes input data that consists of dates and dollar amounts, and gives you back the dollar amounts adjusted for inflation using a date of your choice.
It uses the St. Louis FRED API to fetch the adjustment data. Data used is the Consumer Price Index for All Urban Consumers (a.k.a. CPIAUCSL or CPI-U), and is available dating back to 1947.
Both the text box and the file upload should understand csv and tsv data that consists of a date and a number that represents a US dollar amount. Make sure the name of the date column is "date". The other column can be called whatever you want.
Q: It said it couldn't handle my data!
A: Here are the most likely scenarios:
Q: I typed stuff in the text box and also chose a file. Which is it going to use?
A: The file.
Q: How does this work?
A: It adjusts prices using the US Consumer Price Index. Here is the annual CPI data. You can try adjusting this data--the adjusted values will all be the same.