I Bond Inventory Tracker

Valuation settings

Total value
Purchase amount
Total principal
Interest earned
Penalty impact
Only applies to bonds under 5 years
Blended rate
Current weighted composite rate

I Bond valuations

How to use this app…

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  1. Use the Add bond button to add your bonds. If you have many, you may also create a CSV file and import it.
  2. Use the Backup button to back up your inventory. Do this each time you make changes or additions.
  3. Use the Import button to restore or to create your inventory from a CSV file.
  4. You may see projected future or actual past valuations by changing the Valuation settings.
CSV format
One bond per line, format MM,YYYY,Amount, for example 03,2026,1000. Importing a CSV replaces your current entire inventory.
Privacy & Security
This app makes no external network requests except fetching public rate data from this site on load. Your bond inventory never leaves your browser — nothing is transmitted, logged, or tracked.

Month Fixed Inflation (semi) Composite Interest Value
New rate cycle starts Current valuation month Valuation month (bond matured) Blue text = penalty period (under 5 yrs)