Why can the calculator adjust inflation for different months during the same year?
Tom’s Inflation Calculator uses annual inflation data, not monthly inflation data. Adding monthly data would make the program much larger (taking longer to download) and would not be useful for calculations spanning several years. Also, I don’t want to bother making updates every month! If you want to make monthly calculations within a year, try using the U.S. Bureau of Labor Statistics inflation calculator. It uses the same CPI-U (annual average) data that my Inflation Calculator uses by default, but it includes the latest monthly inflation data. For my calculator, I update the data only once a year (in January), when the data is more settled. (The government sometimes revises its monthly inflation data.) When converting between other years, rounding errors during calculations may cause insignificant differences between the answers from my calculator and the BLS calculator. Note that the BLS calculator covers only the years 1913 to present. Unlike my calculator, it doesn’t include his
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