Savings iBond Calculator
Calculate the current value and returns of your US Treasury iBonds with our free calculator. Get accurate valuations based on official Treasury data, including inflation adjustments and interest earnings for your Series I Savings Bonds investment.
iBond Calculator Tool
Minimum holding period
12 months
Cannot be redeemed before 12 months
Interest accrual
Every 6 months
Interest compounds automatically
Purchase limits
$25 - $10,000/year
Per person per calendar year
Inflation protection
Rate adjusts automatically
Protects against inflation
Investment Amount
Enter your iBond purchase amount
Purchase Date
When did you buy the iBond?
Ready to Calculate Your iBond Value
Enter your investment amount and purchase date to see the current value of your iBonds.
Tip: Your iBond value is calculated using official US Treasury data and includes compound interest.
Frequently asked questions
Get answers to common questions about iBonds, calculations, and how to maximize your savings.