So... The past 3 months, inflation has been 7.24%

[progree]

2. To get more accuracy, I put in $100 rather than $1

($10,000 is even better, but in the below I used $100)

https://data.bls.gov/cgi-bin/cpicalc.pl?cost1=100&year1=202303&year2=202403

Result: $103.48 which is a 3.48% increase which matches the below:

CPI: https://data.bls.gov/timeseries/CUSR0000SA0

Click on "MORE FORMATTING OPTIONS" and click the following checkboxes: "original data value", "3 month percent change", and "12 month percent change" checkboxes, and then click the Retrieve Data button.

On the 12 month one it shows 3.5% for March 2024 which is 3.48% rounded.

Using the original data values
The 12 months Mar'23-Mar'24 is 312.230/301.744 = 1.03475 -> 3.475% -> 3.48% -> 3.5%

Graphs of all the inflation measures through March (month by month and rolling 3 month averages)
https://www.democraticunderground.com/10143231474#post1

Edited to add: On my graphs the numbers are all annualized (for easy comparisons to each other and to the 2% Fed target), so that has to be taken into account when comparing to CUSR0000SA0 or the inflation calculator, neither of which annualizes.