A Savings Bond Calculator That Actually Saves Your Inventory

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.

Same numbers, modern experience

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:

• Your inventory saves — in Chrome, Edge, Safari and Firefox alike, stored privately in your browser.
• Matured-bond alerts — every bond past final maturity is flagged so idle money is obvious.
• Totals at a glance — portfolio value, total interest earned, matured count.
• Estate-ready output — print a clean PDF report or export CSV for the bank, the attorney, or your records (Pro).
• Privacy by architecture — serial numbers and values never leave your device. There is no account and no server-side storage at all.

When to use TreasuryDirect instead

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.

→ Check your bond's value now (free)