This is a python library that calculates the current value of a Series I Savings Bond. The historic rates are supplied via a data file which is updated every time a new rate is released by Treasury Direct.

This project can be installed via pip. To install the library, run:

pip install ibonds

If you are interested in tracking more than one I Bond, and would prefer a command line interface, please check out lakshmi. If you like a spreadsheet instead, eyebonds.info is a great resource.

I would like to acknowledge eyebonds.info and Bogleheads websites which I used to understand I Bond interest rate calculations.

This library has no link to official Treasury Direct website. No claim is made for any accuracy of data that you generate using this code. Although I have tried my best to implement the formula presented in Tresury Direct, the values returned by this module might be incorrect. When in doubt, go to the official Treasury Direct website to verify any and all information.