Savings Bond Calculator
United States Uses U.S. IRS retirement-account and federal deposit rules. Figures are in U.S. dollars.
Savings bond calculator: value a Series I or EE bond from the TreasuryDirect rates, with the rate for each six months, the early-cashing penalty and the EE doubling.
Educational estimate only. Not a lending decision. Your numbers stay in this browser.
Results
How to read this: the verdict describes how much room your numbers leave, not a decision or an offer. Change any input to see how much the result moves.
Investing and retirement guides
These guides explain compounding, contribution projections, retirement targets, inflation, and real returns.
- Compound interest explained
- Investment return with contributions
- Retirement savings target
- Inflation and real returns
For all guide topics, open Guides. For source and estimate boundaries, read Calculation Methodology and Sources and Assumptions.
Assumptions and formula
Each bond earns interest monthly and compounds every six months from its issue month. A Series I bond’s rate for each six months is its fixed rate plus an inflation rate reset every May and November: fixed + 2 × semiannual inflation + fixed × semiannual inflation, never below zero. A Series EE bond issued since May 2005 earns the fixed rate set when it was bought for 20 years.
Values are worked as TreasuryDirect does: per $25 of face value, the monthly value is the value at the start of the six months × (1 + rate ÷ 2) to the power months ÷ 6, rounded to the cent, then scaled to the bond. Before five years the last 3 months of interest are forfeited, and a bond cannot be cashed in its first 12 months. EE bonds are worth at least double their price at 20 years. Bonds stop earning at 30 years. The rate tables run to October 2026.
Worked example
A $50 Series I bond issued in January 2020 has a 0.20% fixed rate. Its rate has ranged from 1.26% to 9.83% (July 2022: 0.20% + 2 × 4.81% + 0.20% × 4.81%); in October 2026 it is worth $65.32, $15.32 of interest, about 4.0% a year. A $50 paper EE bond bought for $25 in May 2010 at 1.40% is worth $31.44 and will be worth $50 in May 2030.
Frequently asked questions
What is a $50 I bond from 2020 worth?
A $50 Series I bond issued in January 2020 is worth $65.32 in October 2026, about 4.0% a year, and earns 3.54% for its current six months.
How much is my savings bond worth?
Enter the series, the issue month and what was paid. A $50 Series I bond bought in January 2020 is worth $65.32 in October 2026; a $50 paper EE bond bought for $25 in May 2010 is worth $31.44. The calculator works these from the TreasuryDirect rates and matches Treasury’s redemption values.
How is the I bond rate calculated?
From a fixed rate set when the bond is bought and an inflation rate reset every May and November: fixed + 2 × semiannual inflation + fixed × semiannual inflation. For May to October 2026 that is 0.90% + 2 × 1.67% + 0.90% × 1.67% = 4.26%. Each bond uses the new rate from its own six-month anniversary.
Should I cash an I bond before 5 years?
You lose the last 3 months of interest. On a $50 I bond bought in May 2023 that is $0.60 in October 2026, against holding it to May 2028 to avoid it. If you can get more elsewhere for the time left, cashing may still pay; the calculator shows the penalty in dollars.
When does an EE bond double?
At 20 years for EE bonds bought since June 2003: Treasury adds whatever is needed for the bond to be worth twice its price. A paper $50 EE bond bought for $25 in May 2010 is worth $31.44 in October 2026 and will be worth $50 in May 2030.
Which savings bonds does this calculator cover?
Series I bonds from September 1998 and Series EE bonds issued from May 2005, valued to October 2026, the last month the published rates cover. For Series E, HH, savings notes and EE bonds issued before May 2005, use TreasuryDirect’s savings bond calculator.
Is this an I bond calculator or an EE bond calculator?
Both: a savings bond calculator, I bond calculator and EE bond calculator that values each bond from its rate history and shows the rate for every six months. It is a savings bond value calculator, Series I bond calculator and US savings bond calculator.
How do I look up a savings bond value?
Enter the series, the issue date and the face value: the calculator gives the current value of Series EE and Series I bonds from the Treasury’s own redemption tables, the same US savings bond valuation TreasuryDirect uses.
Sources
Sources reviewed 3 October 2026: checked against their current editions on that date.
- TreasuryDirect, I bonds interest rates: fixed rates and semiannual inflation rates from September 1998, and the composite rate formula.
- TreasuryDirect, EE bonds issued May 2005 and later: fixed rates, semiannual compounding and the 20-year doubling guarantee.
- TreasuryDirect, Savings bond calculator: values for bonds under five years exclude the last 3 months of interest.
This page is an educational estimate, not personal financial or tax advice. Eligibility and individual circumstances can change the result.