31 C.F.R. § 359.40 – How can I find out what my definitive Series I savings bonds are worth?

(a) Redemption values. Redemption values are available for definitive bonds in various formats and media.
1. (1) You may determine the redemption value for definitive bonds on the Internet at www.savingsbonds.gov.
2. (2) You may download savings bonds calculators from the Internet at www.savingsbonds.gov.
3. (3) You may obtain paper tables from the Bureau of the Fiscal Service, Parkersburg, West Virginia 26106-1328. We reserve the right to cease making paper tables of redemption values available.
(b) Redemption penalty. Redemption values published in the tables reflect the three-month interest penalty applied to bonds redeemed prior to five years from the date of issue.