Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Yield to maturity (approx.)
5.729%
Current yield
4.891%
Annual coupon income
$450.00
Total coupons to maturity
$3,600.00
Gain at maturity vs price paid
$800.00
Total return to maturity
$4,400.00
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter face value ($).
- 2Enter purchase price ($).
- 3Enter coupon rate (%).
- 4Enter years to maturity.
- 5Enter number of bonds.
- 6Read your yield to maturity (approx.) on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
A bond bought below par yields more than its coupon; bought above par it yields less. Yield to maturity blends the coupon stream with that price difference.
Worked example
Using the values the calculator loads with:
Inputs
- Face value: 1000 $
- Purchase price: 920 $
- Coupon rate: 4.5 %
- Years to maturity: 8
- Number of bonds: 10
Results
- Yield to maturity (approx.): 5.729%
- Current yield: 4.891%
- Annual coupon income: $450.00
- Total coupons to maturity: $3,600.00
- Gain at maturity vs price paid: $800.00
- Total return to maturity: $4,400.00
What each field means
Inputs
- Face value ($)
- The face value used in the calculation, measured in $. Starts at 1000 $ so you have a working example on load.
- Purchase price ($)
- The purchase price used in the calculation, measured in $. Starts at 920 $ so you have a working example on load.
- Coupon rate (%)
- The coupon rate used in the calculation, measured in %. Starts at 4.5 % so you have a working example on load. Accepted range: 0–25 %.
- Years to maturity
- The years to maturity used in the calculation. Starts at 8 so you have a working example on load. Accepted range: 0.5–40.
- Number of bonds
- The number of bonds used in the calculation. Starts at 10 so you have a working example on load.
Results
- Yield to maturity (approx.)
- Returned as a percentage and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Current yield
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual coupon income
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total coupons to maturity
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gain at maturity vs price paid
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total return to maturity
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the bond yield calculator work?
A bond bought below par yields more than its coupon; bought above par it yields less. Yield to maturity blends the coupon stream with that price difference. The underlying maths is: Current yield = Annual coupon ÷ Price; YTM approximated by the standard analytic formula.
What do I need to enter?
5 values: face value, purchase price, coupon rate, years to maturity, and number of bonds. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the yield to maturity (approx.) result mean?
It is returned as a percentage and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Bond Yield Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/bond-yield-to-maturity
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/bond-yield-to-maturity" target="_blank" rel="noopener">Bond Yield Calculator — RevenueLab</a> (2026).</p>
Source: [Bond Yield Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/bond-yield-to-maturity) (2026).