You can check the value of your savings bond through the TreasuryDirect website. Even if you have paper savings bonds, you can check your value online, as long as you have the issue date, bond series ...
Apparently, they are valued at their redemption value on the applicable valuation date. In Revenue Ruling 55-278, 1 A, in 1948, bought Series E bonds with his own funds and had them registered in the ...