Inflation and I Bond

The I Bond Calculator

Use the I Bond Calculator to get monthly values of your I bond investment. Get a graphical comparison of your I bond's growth to inflation. Download monthly values in CSV format.

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Inflation Calculator
Create a Summary of All Your I Bonds

Use this tool to generate a table summarizing all your I bonds as of the first of the current month. The table will list out the following information:

  • Purchase date
  • Purchase amount
  • Fixed interest
  • Accrued value, and
  • Redemption value.

An additional column will contain a link to the details of the individual I bonds. A copy button makes it easy to copy and paste the generated table into Microsoft Excel or other applications.

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Track I Bond in Quicken and Moneydance
Generate price history files for I bonds. Upload these files to Quicken or Moneydance to track them in these two programs.

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Replace Old I Bond with New I Bond
Evaluate if replacing an old I bond with a new I bond is more beneficial than holding onto the old I bond.

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