Updated August 2026
The Treasury's own Savings Bond Calculator is accurate — but it warns, in its own words, that inventories it creates “cannot be saved” when using Google Chrome or Microsoft Edge. That's roughly 9 out of 10 visitors, left retyping every bond on every visit. The tool dates from an era of Internet Explorer HTML-file tricks, and the bank-facing companion (Savings Bond Pro) was retired in May 2025.
This site reads the same official dataset — the Treasury's public-domain Savings Bonds Value Files, updated every May and November — so the values match the government calculator penny for penny. The difference is everything around the numbers:
For electronic bonds, log in to your TreasuryDirect account — electronic holdings show their value there natively. And when you're ready to cash paper bonds, treasurydirect.gov explains the bank and mail-in options. For valuing and organizing paper bonds, start here.
Neither tool invents its own values. Both read the Bureau of the Fiscal Service's published Savings Bond Value Files, so a correctly entered bond returns the identical figure on either site. The difference this site adds is entirely on top of that shared data — inventory that survives a browser refresh, matured-bond flags, and portfolio totals — not a different or "unofficial" number. See exactly how the lookup works on the How We Calculate page.
If you've been re-entering the same bonds on TreasuryDirect every few months because the browser warning wiped your list, the switch is a one-time copy: for each bond, note the series, denomination, and issue month (serial numbers are optional, for your own reference only — they aren't used in the value lookup) and add it here once. From then on the list persists in your own browser without needing to retype anything.
No. SavingsBondValues.com is an independent site, not operated by or affiliated with the Treasury, the Bureau of the Fiscal Service, or TreasuryDirect. It's built specifically to fix the two practical gaps in the official calculator — inventories that don't persist in modern browsers, and the retired bank-facing Savings Bond Pro tool — while using the same public-domain data. Full detail on independence and data handling is on the About page.
Will the value shown here ever differ from TreasuryDirect's? It shouldn't, for the same bond entered the same way — both pull from the same published tables. If you ever see a discrepancy, let us know the bond's series, denomination, and issue date and we'll check it.
Do I need an account to use this? No — there's no login, no account, and nothing is sent to a server. Your inventory lives only in your own browser's local storage.