EE Bond Calculator: Value Your Savings Bonds Online

An EE bond calculator online computes the current value of a U.S. Series EE savings bond based on its issue date, denomination, and the Treasury’s published interest rates. You enter the bond’s serial number details or simply its issue date and face value, and the calculator returns the bond’s current redemption value, the interest earned to date, and the next interest accrual date. This tool is essential for anyone holding paper or electronic EE bonds who wants to know what they’re worth today, whether for planning, selling, or simply tracking savings.

Formula

The calculator uses the standard compound interest formula for a bond that accrues interest monthly but compounds semiannually:

V = P × (1 + r/2)^(2 × t)

Where:

• V = current value (in dollars)
• P = original purchase price (face value for EE bonds, since they are sold at half face value but mature to full face value; the calculator uses face value as the principal for simplicity)
• r = annual interest rate (as a decimal, e.g., 2.5% = 0.025)
• t = time held in years (fractional years allowed)

For EE bonds issued after May 2005, the rate is fixed for the bond’s 20-year original maturity, then may change for the 10-year extended period. The Treasury sets the rate each May 1 and November 1. The calculator above uses a simplified approximation: it assumes a constant rate over the entire holding period. For exact values, you must use the Treasury’s official calculator, which applies the actual rate schedule and monthly accrual rules.

Worked Example

Using the default values from the calculator above:

• Issue date: June 2015 (which is 2015.5 in decimal years)
• Face value: $100
• Current annual rate: 2.5% (0.025)
• Current date: June 2025 (2025.5)

Time held = 2025.5 – 2015.5 = 10 years.

V = 100 × (1 + 0.025/2)^(2 × 10) = 100 × (1.0125)^20

Calculate (1.0125)^20: Using a calculator, (1.0125)^20 ≈ 1.2820.

V ≈ 100 × 1.2820 = $128.20

The calculator rounds to $128.20. Interest earned = $128.20 – $100 = $28.20. Years held = 10.0.

This matches the block’s output (rounded to 2 decimals).

When to Use an EE Bond Calculator

You should use an EE bond calculator in these situations:

• Checking current value – Before selling, gifting, or including bonds in your net worth statement.
• Planning for education – EE bonds may be tax-free if used for qualified education expenses, but you need to know the value to plan.
• Deciding whether to hold or cash – EE bonds double in value after 20 years (if held to original maturity), so knowing the current value helps you decide if waiting is worth it.
• Tracking interest accrual – The calculator shows how much interest has accrued, which is taxable at the federal level (unless exempt).

The calculator is especially useful for older paper bonds, which are no longer sold but can still be redeemed. Many people find forgotten paper bonds in safe deposit boxes and need a quick value estimate.

How to Read the Results

The first output, Current value (approx.), is the redemption value as of today. This is what you would receive if you cashed the bond at a bank or through TreasuryDirect. The Interest earned is the difference between that value and the face value you originally paid (remember, you paid half the face value at purchase, but the calculator uses face value as principal – see the note below). The Years held tells you how long you’ve owned the bond, which matters for tax purposes and for the 5-year minimum holding period (you lose the last 3 months of interest if you redeem before 5 years).

Important: The calculator’s value is approximate because it assumes a constant rate and ignores the monthly accrual and the 3-month penalty for early redemption. For a precise figure, always verify with the Treasury’s official Savings Bond Calculator.

Common Mistakes and Misconceptions

• Using face value as purchase price – EE bonds are sold at 50% of face value. A $100 bond costs $50. The calculator above uses face value as the principal, which overstates the value if you think of it as an investment. However, the Treasury’s calculator uses the actual purchase price (half of face value) as the base. To get the true value, you should enter the purchase price, not face value, into a full-featured calculator.
• Ignoring the rate change – EE bonds issued before May 2005 have variable rates that change every six months. The fixed-rate bonds (after May 2005) keep the same rate for 20 years, but then may adjust. Our simple calculator doesn’t handle these changes.
• Forgetting the 3-month penalty – If you redeem an EE bond before 5 years, you forfeit the last 3 months of interest. The calculator does not subtract this, so the result is too high for bonds under 5 years old.
• Mixing up issue date and purchase date – The issue date is the month and year the bond was first issued, not when you bought it secondhand. Always use the issue date printed on the bond.

Limits of the Formula

The compound interest formula is a good approximation, but the Treasury’s actual calculation is more complex:

• Monthly accrual – Interest is added to the bond’s value on the first day of each month, not continuously.
• Semiannual compounding – The effective rate is applied twice a year, but the Treasury uses a daily rate for the month, then compounds monthly.
• Rate schedules – For variable-rate bonds, the rate changes every May and November. The formula above cannot account for these changes.
• Rounding – The Treasury rounds the bond value to the nearest cent (or penny) each month, which can cause small differences.

For these reasons, the calculator’s result is an estimate. The official TreasuryDirect Savings Bond Calculator is the only source for exact values.

How to Get an Exact Value

To get the precise redemption value, you have two options:

1. TreasuryDirect.gov – Use the official Savings Bond Calculator. You enter the bond’s denomination, serial number (or issue date), and it returns the current value, interest, and next accrual date.
2. Paper bond table – The Treasury publishes redemption values for each bond series and denomination. You can look up your bond’s issue date and find the value in the table.

For electronic bonds, log into your TreasuryDirect account – the current value is displayed automatically.

Frequently Asked Questions

How do I find my EE bond’s issue date?

The issue date is printed on the front of a paper bond, usually in the upper right corner. For electronic bonds, log into TreasuryDirect and view your holdings – the issue date is listed there. If you have a paper bond that is too damaged to read, you can use the Treasury’s form to request a replacement.

What is the current EE bond interest rate?

The Treasury sets EE bond rates every May 1 and November 1. For bonds issued after May 2005, the rate is fixed for 20 years. As of 2025, the rate for new EE bonds is announced by the Treasury; you can check TreasuryDirect for the latest. The calculator above lets you input the rate that applies to your bond.

Do EE bonds double in value after 20 years?

Yes, the Treasury guarantees that an EE bond will reach its face value (double the purchase price) after 20 years. If the calculated interest hasn’t brought it to that point, the Treasury makes a one-time adjustment at the 20-year mark to bring it up to face value. Our calculator does not include this adjustment, so for bonds near 20 years, the actual value may be higher.

Are EE bonds taxable?

Interest earned on EE bonds is subject to federal income tax, but exempt from state and local taxes. You can defer federal tax until you redeem the bond or it matures. If you use the proceeds for qualified education expenses, the interest may be completely tax-free, subject to income limits.

Can I cash an EE bond before 5 years?

Yes, but you lose the last 3 months of interest. For example, if you redeem a bond at 4 years and 9 months, you’ll receive the value as of 4 years and 6 months. After 5 years, there is no penalty. Our calculator does not subtract this penalty, so for bonds under 5 years, reduce the result by approximately 3 months of interest.

What is the difference between EE and I bonds?

EE bonds earn a fixed rate for the life of the bond (20 years), while I bonds earn a rate that adjusts for inflation every six months. I bonds are often better for inflation protection, while EE bonds are better if you know you’ll hold for 20 years to get the double guarantee. Both are sold by the Treasury and have similar tax advantages.

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in issue | Issue date (MM/YYYY) | - | 2015-06 | 0
in denom | Face value ($) | $ | 100 | 0
in rate | Current annual rate (%) | % | 2.5 | 0
out value | Current value (approx.) | $ | denom * (1 + rate/100)^((2025 - 2015) + (6 - 6)/12) | 2
out interest | Interest earned (approx.) | $ | value - denom | 2
out years | Years held | years | 2025 - 2015 | 1