Bond Calculator: Is This Bond Worth Buying?
Is this bond a good investment?
Bond Yield, Duration & Return Analyzer
Enter bond details to get YTM, after-tax yield, modified duration, rate sensitivity, total return breakdown, and comparison vs alternative yield. Results update live.
Bond Details
Usually $1,000 or $10,000
Annual interest on face value
What you pay today
Results are estimates only and do not constitute financial, tax, or legal advice. Consult a qualified professional before making financial decisions.
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Bonds are one of the most widely held but least understood investments. A bond's listed coupon rate tells you what it pays relative to face value — but yield to maturity (YTM) is what you actually earn if you buy it today at market price and hold it until maturity. When a bond trades at a discount (below face value), YTM is higher than the coupon rate. When it trades at a premium (above face value), YTM is lower. This gap between coupon rate and YTM is the critical insight most bond buyers miss. This calculator computes yield to maturity using the standard approximation formula, current yield (annual coupon ÷ current price), total return (all coupon payments plus principal), and the break-even comparison against alternative investments. It also shows the interest rate sensitivity: how much your bond's price would change if interest rates rise or fall by 1%. Duration — a bond's sensitivity to interest rate changes — is one of the most important risk metrics for bond investors. A bond with a 7-year duration loses approximately 7% of its value for every 1% rise in interest rates. In a rising rate environment, understanding duration helps you manage the risk of holding long-term bonds that decline in price before maturity. Whether you're evaluating a corporate bond, Treasury, or municipal bond (which may offer tax-exempt income), the calculator gives you the comparable after-tax yield to make honest comparisons.
- →Evaluating whether a specific bond's yield justifies the risk vs. alternatives
- →Calculating yield to maturity on a bond trading above or below face value
- →Understanding how much your bond portfolio would lose if rates rise 1%
- →Comparing a taxable corporate bond vs. tax-exempt municipal bond on after-tax basis
- →Building a bond ladder and calculating total income at each maturity date
David is considering a corporate bond: face value $10,000, coupon rate 4.5%, current price $9,400, 6 years to maturity. The calculator shows: current yield 4.79% ($450 ÷ $9,400), yield to maturity 5.68% (accounting for the $600 discount recouped at maturity), total return $12,700 ($2,700 in coupons + $600 price appreciation + $10,000 principal). He compares the 5.68% YTM against a 5-year Treasury at 4.8% — the spread compensates for the credit risk. He buys.
What is the difference between coupon rate, current yield, and yield to maturity?
Coupon rate is fixed: it's the annual interest payment as a percentage of face value. A $10,000 bond with a 5% coupon pays $500/year regardless of what you paid for it. Current yield is the annual payment divided by the price you actually paid. Yield to maturity (YTM) is the total annual return including the coupon payments AND the gain or loss from holding the bond to maturity (since you paid more or less than face value). YTM is the most complete measure of a bond's return.
Why do bond prices fall when interest rates rise?
When new bonds are issued at higher rates, existing bonds with lower coupons become less attractive. To attract buyers, their prices fall until their yield equals the new market rate. A bond paying 3% when new bonds pay 5% must drop enough in price to make the 3% coupon deliver 5% on the actual purchase price. This is why existing bonds lose value in a rising rate environment — and why short-duration bonds are less sensitive to rate changes than long-duration bonds.
Are municipal bonds worth considering?
Municipal bonds pay interest that's exempt from federal income tax (and often state tax if you buy bonds from your state). The taxable equivalent yield tells you the before-tax return you'd need from a taxable bond to match a muni's after-tax return. Formula: muni yield ÷ (1 - your marginal tax rate). A 3.5% muni yield for someone in the 32% bracket equals a taxable equivalent of 5.15%. Munis are most valuable for high-income investors in high-tax states.
What is a bond ladder and why use one?
A bond ladder is a portfolio of bonds with staggered maturity dates (e.g., bonds maturing in 1, 2, 3, 4, and 5 years). As each bond matures, you reinvest at current rates. Ladders manage interest rate risk: you're never fully locked into one rate environment, and you have predictable cash flows at known dates. They're popular for near-term funding needs, retirement income planning, and conservative investors who want predictable returns without market volatility.