How much will these savings bonds be worth once they reach they're full earning ability? (CLICK FOR MORE INFO)?

http://www.treasurydirect.gov/BC/SBCPric…
Using the calculator at the website listed above a $50.00 U.S. Series I Savings Bond issued 02/2001 is currently worth $84.58.


There is no hook to "accurately" predict what the final bearing will be once the loosen reaches final maturity in the year 2031 since, equally you mentioned, the interest duty is a combination connected with a fixed rate and a variable rate.