Savings Bond Calculator

Q: What bond types does this calculator support?

This calculator supports Series I , Series EE , Series E , and Savings Notes (Freedom Shares) . Pick the series printed on your bond from the dropdown menu.

Q: Where do I find the issue date on my bond?

The issue date is printed on the front of your paper bond. It shows only a month and year, not a specific day. Enter that month and year into the calculator.

Q: Where is the serial number on a savings bond?

The serial number is printed along the lower edge of your paper bond. It can be up to 13 characters long. This field is optional — leave it blank if you do not have the bond in front of you.

Q: How far back can I check a bond's value?

You can check values as far back as January 1996 . The U.S. Treasury does not provide redemption data before that date, so the calculator cannot go further back.

Q: Can I check a bond's value for a future date?

Yes, but only within the current six-month rate period. The calculator cannot project values beyond that because future interest rates have not been announced yet.

Q: What is the 3-month penalty shown on my bond?

If you cash a Series I or Series EE bond before holding it for 5 years , you lose the last 3 months of interest. The calculator applies this penalty automatically and shows the adjusted value.

Q: What does the next accrual date mean?

Savings bonds add interest every 6 months based on the month they were issued. The next accrual date is when your bond will next gain interest. If you cash out before that date, you only get the value from the previous accrual.

Q: What does a matured status mean?

A matured bond has reached its final maturity date and has stopped earning interest. You should redeem it because keeping it will not add any more value.

Q: How many bonds can I add to the inventory?

There is no limit. You can add as many bonds as you like. The calculator will track each one and give you a combined portfolio summary at the bottom.

Q: What does the weighted average rate in the portfolio summary mean?

It is the blended interest rate across all your bonds that are still earning interest. Bonds with a higher current value have more weight in the average. Matured bonds are not included because they earn 0%.

Savings Bond Calculator

Updated Jul 7, 2026 By Jehan Wadia

Introduction

This free Savings Bond Calculator helps you find the current value of your U.S. savings bonds. It works with Series I, Series EE, Series E, and Savings Notes. Just pick your bond type, enter the face value and issue date, and the tool does the math for you. It shows how much interest you have earned, what your bond is worth today, and when it will reach full maturity.

You can add more than one bond to build a full inventory. The calculator tracks each bond's interest rate history, next accrual date, and whether it still earns interest or has matured. It also gives you a step-by-step breakdown of how your bond's value is computed, so you can see exactly where the numbers come from. A portfolio summary ties everything together with your total return and blended rate across all bonds.

Whether you found old paper bonds in a drawer or you want to check on bonds you bought years ago, this tool gives you clear answers in seconds — no account login needed.

How to Use Our Savings Bond Calculator

Enter a few details about your U.S. savings bond below. The calculator will show you its current value, total interest earned, interest rate, and maturity date. You can add more than one bond to see a full portfolio summary.

Bond Series — Pick the series printed on your bond. Choose from Series I, Series EE, Series E, or Savings Notes. Each type earns interest in a different way.

Denomination — Select the face value printed on your bond, such as $50, $100, or $1,000. The choices update based on the series you picked.

Issue Date — Enter the month and year your bond was issued. You can find this date printed on the front of your bond.

Serial Number — This field is optional. Type the serial number found along the bottom edge of your bond. It helps you tell your bonds apart if you add more than one.

Calculate Value As Of — Choose the month and year you want to check your bond's value. You can pick today's date, a past date back to January 1996, or a near-future date. Press Update Date to recalculate all bonds in your list at once.

Click Add Bond to place your bond in the inventory table. You can add as many bonds as you like. The calculator will display each bond's issue price, total interest, year-to-date interest, current rate, next accrual date, and maturity status. It also provides a step-by-step breakdown of how your bond's value is calculated and a chart comparing issue price to interest earned.

What Are U.S. Savings Bonds?

U.S. savings bonds are a way to lend money to the federal government. In return, the government pays you interest over time. They are one of the safest investments you can make because they are backed by the full faith of the U.S. Treasury. If you are looking at other safe places to park cash, a CD Calculator can help you compare certificate of deposit returns side by side with your bond earnings.

Types of Savings Bonds

Series I bonds protect your money from inflation. They earn a fixed rate plus a rate that changes every six months based on how fast prices rise. If inflation goes up, your interest goes up too. You can use our Inflation Calculator to see how purchasing power has changed over the life of your bond, or check the latest consumer price trends with our CPI Inflation Calculator.

Series EE bonds earn a fixed interest rate set when you buy them. They also come with a guarantee: if you hold an EE bond for 20 years, the Treasury will double its value. Our Rule of 72 Calculator can show you how long it takes other investments to double at a given rate, making it easy to compare EE bonds with alternatives.

Series E bonds are older bonds sold between 1941 and 1980. They are no longer sold, but many are still held by families. All Series E bonds have now reached final maturity and have stopped earning interest.

Savings Notes (Freedom Shares) were sold from 1967 to 1970. Like Series E bonds, they have all matured and no longer earn interest.

How Savings Bonds Earn Interest

Savings bonds do not pay interest like a bank account. Instead, their value grows over time through compound interest. Interest is added every six months based on the month the bond was issued. This is called an accrual date. If you cash a bond between accrual dates, you only get the value from the last one. To understand how compounding frequency affects growth, our APY Calculator can help you compare the effective annual yield of your bonds with other savings products.

For Series I and EE bonds bought within the last five years, there is a penalty. You lose the last three months of interest if you cash the bond before holding it for five years. You cannot cash any I or EE bond at all during the first 12 months.

Issue Price vs. Face Value

Not all bonds cost the same as their face value. Series EE paper bonds were sold at half their face value. A $100 EE bond cost $50. Series I paper bonds were sold at full face value, so a $100 I bond cost $100. Series E bonds were sold at 75% of face value, and Savings Notes were sold at 81%. If you want to understand how the difference between purchase price and redemption value translates into yield, our Bond Yield Calculator can express that return as an annualized rate, and our Bond Value Calculator can help you price other types of bonds.

When Do Savings Bonds Mature?

Series EE and I bonds reach final maturity 30 years after their issue date. Series E bonds matured 40 years after issue. Savings Notes matured after 30 years (by the year 2000 at the latest). Once a bond matures, it stops earning interest completely. At that point, you should cash it in. After redeeming matured bonds, you might consider rolling the proceeds into a high-yield savings account, a Roth IRA, or other long-term vehicles — our Investment Calculator can help you model the growth.

Why Use a Savings Bond Calculator?

The value of a savings bond changes every six months, and the interest rates can shift with each new period. A savings bond calculator lets you look up exactly what your bond is worth on any given date. It shows you how much interest you have earned, what rate you are getting now, and when your next interest payment will be added. This helps you decide the best time to redeem your bonds. If your bonds are part of a larger financial picture, our Net Worth Calculator can help you see how they fit alongside other assets, and our Retirement Calculator can show whether your combined savings are on track for the future. For a broader look at how your money grows over time, try our Savings Calculator or Future Value Calculator.

Formulas used

Issue Price

P = \text{Face Value} \times f, \quad f \in \{0.50,\;0.75,\;0.81,\;1.00\}

Series I Composite Annual Rate

r = f + 2i + f \times i, \quad r = \max(r,\;0)

Six-Month Accrual Periods Held

n = \left\lfloor \frac{\text{Months Held}}{6} \right\rfloor

Bond Value (Semiannual Compounding)

V = P \times \prod_{k=1}^{n}\left(1 + \frac{r_k}{2}\right)

3-Month Early-Redemption Penalty (held < 5 years)

V_{\text{penalty}} = P \times \prod_{k=1}^{\left\lfloor (\text{months} - 3)/6 \right\rfloor}\left(1 + \frac{r_k}{2}\right)

Series EE 20-Year Doubling Guarantee

V_{20} = \max\!\left(V_{\text{compounded}},\; 2P\right)

Total Interest Earned

I = V - P

Portfolio Weighted Average Rate

\bar{r} = \frac{\displaystyle\sum_{i} r_i \times V_i}{\displaystyle\sum_{i} V_i}

Frequently asked questions

What bond types does this calculator support?

This calculator supports Series I, Series EE, Series E, and Savings Notes (Freedom Shares). Pick the series printed on your bond from the dropdown menu.

Where do I find the issue date on my bond?

The issue date is printed on the front of your paper bond. It shows only a month and year, not a specific day. Enter that month and year into the calculator.

Where is the serial number on a savings bond?

The serial number is printed along the lower edge of your paper bond. It can be up to 13 characters long. This field is optional — leave it blank if you do not have the bond in front of you.

How far back can I check a bond's value?

You can check values as far back as January 1996. The U.S. Treasury does not provide redemption data before that date, so the calculator cannot go further back.

Can I check a bond's value for a future date?

Yes, but only within the current six-month rate period. The calculator cannot project values beyond that because future interest rates have not been announced yet.

What is the 3-month penalty shown on my bond?

If you cash a Series I or Series EE bond before holding it for 5 years, you lose the last 3 months of interest. The calculator applies this penalty automatically and shows the adjusted value.

What does the next accrual date mean?

Savings bonds add interest every 6 months based on the month they were issued. The next accrual date is when your bond will next gain interest. If you cash out before that date, you only get the value from the previous accrual.

What does a matured status mean?

A matured bond has reached its final maturity date and has stopped earning interest. You should redeem it because keeping it will not add any more value.

How many bonds can I add to the inventory?

There is no limit. You can add as many bonds as you like. The calculator will track each one and give you a combined portfolio summary at the bottom.

What does the weighted average rate in the portfolio summary mean?

It is the blended interest rate across all your bonds that are still earning interest. Bonds with a higher current value have more weight in the average. Matured bonds are not included because they earn 0%.

Why does my Series EE bond show a different issue price than its face value?

Paper Series EE bonds were sold at half their face value. A $100 EE bond cost $50. The calculator shows $50 as the issue price because that is what was actually paid.

How is the interest rate calculated for Series I bonds?

Series I bonds use a fixed rate set when you buy the bond plus an inflation rate that changes every six months. The two rates are combined using a formula: fixed + (2 × inflation) + (fixed × inflation). The result cannot go below zero.

Will my Series EE bond really double in value?

Yes, but only if you hold it for at least 20 years. The Treasury guarantees that EE bonds issued from May 2005 onward will be worth at least twice their issue price at the 20-year mark. The calculator accounts for this guarantee.

What is year-to-date interest?

Year-to-date (YTD) interest is how much interest your bond has earned since January 1 of the year shown in the as-of date. It helps you estimate the taxable interest for that calendar year.

Is my bond data saved after I close the page?

No. The calculator runs in your browser only for the current session. If you close or refresh the page, your bond list will reset. Write down your results or take a screenshot if you need to keep them.

How do I update the as-of date for all my bonds at once?

Change the month and year in the Calculate Value As Of fields, then click the Update Date button. Every bond in your inventory will be recalculated to that new date.

What does the step-by-step section show?

It walks you through the math behind the most recently added bond. You can see the issue price calculation, the number of compounding periods, the rate used, the current value, total interest, and year-to-date interest — all broken into clear steps.

Why is my bond's value the same as last month?

Savings bonds only add interest every 6 months on their accrual date. Between accrual dates, the value stays the same. Check the next accrual date column to see when the value will change.

Can I use this calculator for electronic bonds bought on TreasuryDirect?

You can use it to estimate values, but electronic bonds purchased on TreasuryDirect may have custom denominations (any amount from $25 up). This calculator only lists the standard paper bond denominations. For exact values of electronic bonds, log in to your TreasuryDirect account.

What does the chart at the bottom show?

The stacked bar chart compares each bond's issue price (what you paid) to the interest earned (what the bond has gained). Together they equal the bond's current value. It gives you a quick visual of how much growth each bond has produced.

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