Bond Accrued Interest Calculator
Use the Bond Accrued Interest Calculator with your own values for Day-count convention, Face value, Annual coupon rate, Clean price, Last coupon date, Trade / settlement date, Next coupon date, and Payments per year. It reports Accrued days, Coupon-period days, Accrued interest, and Dirty price, shows the formula and worked example, and does not fetch live market or account data.
Learn the method: step-by-step examples and practice ↓
Calculate, then understand
Step-by-step learning lab
Identify whose cash flow this is and when it occurs. Enter the given values, then follow the calculation as each number changes.
Given days: 360-day annual basis
When an exercise already gives the accrued days, how much interest and full price does the buyer pay?
When to use it and why it works
The buyer will receive the next full coupon, so the seller is compensated for interest already earned. Calculate the period’s coupon, allocate it by time, and add it to the clean price.
AI = F × c × d/360; P_dirty = P_clean + AI
Work through an example
Use the given 63 days, face value 100, annual coupon 6%, clean price 96, and the 360-day annual basis. Find accrued interest and full price.
Read this example’s explanation
Annual coupon = 100×6% = 6; 6×63/360 = 1.05; 96+1.05 = 97.05.
Your calculated answer
- Accrued day count
- 63days
- Day-count denominator
- 360days
- Coupon matching the denominator
- 6
- Accrued interest
- 1.05
- Dirty / settlement price
- 97.05
Follow each step
Use the given days without deriving calendar dates
d = 63 = 63Calculate the coupon matching the denominator period
100 × (6 ÷ 100) ÷ 1 = 6Find the elapsed fraction of the interest period
63 ÷ 360 = 0.175Allocate interest earned while the seller held the bond
6 × 63 ÷ 360 = 1.05Add accrued interest to the clean price
96 + 1.05 = 97.05
Intermediate calculations retain precision; displayed values are rounded. Follow the precision requested by your question.
What the result means
Accrued interest belongs to the seller’s holding period. The full price adds that amount to the quoted clean price. Retain precision until the exercise’s final rounding step.
Mistakes to watch for
- The exercise dates 2021-12-31 to 2022-03-05 do not imply 63 days: ordinary start-inclusive/end-exclusive counting gives 64, and the SSE trade-day model gives 65. Here 63 is a stated exercise input, not a calendar result.
- The denominator is the exercise’s annual basis, not the actual length of the calendar year.
- Use the same position scale for face value and price. Enter 6 for 6%, not 0.06, and do not round intermediate amounts to cents.
Try another question on your own
Try face value 200, annual coupon 6%, clean price 190, and 90 accrued days.
Set up the formula first. Answers rounded to two decimals are accepted; use six decimals for absolute values below 0.01. For percentages, enter the number before the percent sign.
How to use this calculator
Enter Day-count convention, Face value, Annual coupon rate, Clean price, Last coupon date, Trade / settlement date, Next coupon date, and Payments per year.
Review the model boundary before calculating: The selected day-count convention and governing market rules control the accrued-interest result.
Read Accrued days, Coupon-period days, Accrued interest, and Dirty price, then compare the result with the cited source and governing product terms.
Formula
Formula used: AI = FV × c × DCF; DCF_SSE = d_[start,trade] − d_Feb29 / 365; P_dirty = P_clean + AI. Percentages are converted to decimals before calculation.
Worked example
Example: with Face value = 100, Annual coupon rate = 8%, Clean price = 103.45, Last coupon date = 2022-01-01, and Trade / settlement date = 2022-03-05, the calculated Dirty price is 104.85273973.
Assumptions and limits
- The selected day-count convention and governing market rules control the accrued-interest result.
- Settlement must fall within the entered coupon period for a valid accrual.
- Recheck dated source rules, product documents, and market conventions before relying on the result.
Sources
- Shanghai Stock Exchange: 上海证券交易所债券净价交易投资者问答Exchange-market clean price, dirty price, and accrued-interest conventions. Reviewed 2026-08-24.
- Financial Industry Regulatory Authority: Accrued Interest CalculatorOfficial formula or method source used by this calculator. Reviewed 2026-08-24.
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Verification
How this calculator is checked
Trust comes from reproducible evidence, not model confidence. You can inspect the formula, assumptions, worked example, and cited sources on this page.
- Versioned calculationFormula logic is kept separate from the interface and covered by automated registry and behavior checks.
- Cited evidenceSources linked for independent checking: 2.
- Transparent AI useAI may assist drafting or adversarial review. Agreement between models is not proof, and no human expert review is claimed unless a named reviewer is shown.
Frequently asked questions
How does the Bond Accrued Interest Calculator work?
Formula used: AI = FV × c × DCF; DCF_SSE = d_[start,trade] − d_Feb29 / 365; P_dirty = P_clean + AI. Percentages are converted to decimals before calculation.
What should I enter in the Bond Accrued Interest Calculator?
Enter Day-count convention, Face value, Annual coupon rate, Clean price, Last coupon date, Trade / settlement date, Next coupon date, and Payments per year using one consistent currency and time basis.
What should I verify before using the Bond Accrued Interest Calculator result?
Verify these limits: The selected day-count convention and governing market rules control the accrued-interest result. Settlement must fall within the entered coupon period for a valid accrual.
Last updated 2026-08-25 · sse-actual-period-us-30-360-v1 · content-2026-08-24 · Published by YunFanLabs