Bond Yield Calculator
This Bond Yield Calculator provides common yield measures used by investors and analysts: Current Yield, Yield to Maturity (YTM, approximate), Yield to Call (YTC, approximate), and Yield to Worst. Enter the clean price (price excluding accrued interest), coupon rate, face value, and term details. For callable bonds, provide the earliest call date and call price to compute call-related yields.
Results include conservative guidance and explicit accuracy caveats. The tool uses closed-form approximations for YTM and YTC; for exact yields a numerical root-finding solution to the bond price equation is required. See methodology and citations for standards, verification practices, and limitations.
Governance
Record e0b502b14ffd • Reviewed by Fidamen Standards Committee
Approximate YTM using the standard linear approximation. For exact YTM use numerical root-finding against the bond price equation; this tool provides a widely used approximation and guidance.
Inputs
Results
Yield to Maturity (%) (approx)
5.00%
| Output | Value | Unit |
|---|---|---|
| Yield to Maturity (%) (approx) | 5.00% | — |
Visualization
Methodology
Current Yield is calculated as annual coupon payment divided by the bond's clean price. It reflects income only and ignores time to maturity and capital gains/losses.
Yield to Maturity and Yield to Call are computed using a commonly used linear approximation: Y ≈ (C + (FV - P)/n) / ((FV + P)/2), where C is annual coupon, FV is face or call price, P is clean price, and n is the number of years to maturity or call. This is an approximation intended for quick estimates; precise values require solving the present value equation for yield via numerical methods.
Yield to Worst selects the lower of the YTM and YTC approximations to present a conservative yield estimate for callable bonds. The tool computes both approximations locally and returns the minimum.
Worked examples
Example 1: A 5% coupon bond with face value 1000, price 950, 5 years to maturity: Current Yield = (0.05*1000)/950 = 5.26%. Approximate YTM per formula will be reported as shown.
Example 2 (callable): Same bond with earliest call in 3 years at call price 1000: YTC will be approximated using years_to_call = 3; Yield to Worst will return the lower of the two approximations.
F.A.Q.
Are the YTM and YTC values exact?
No. This calculator returns widely used approximations for YTM and YTC for quick estimates. Exact yields require solving the bond price equation for the internal rate of return using iterative numerical methods. Use this tool for fast checks and consult precise solver methods when accuracy to basis points is required.
Should I enter clean price or dirty price?
Enter the clean price (excluding accrued interest). If you have the dirty price (including accrued interest), subtract accrued interest before using this calculator or use a dedicated price-to-yield function that accounts for accruals.
Does this handle floating-rate or zero-coupon bonds?
This calculator assumes fixed-rate coupon payments and constant nominal coupon rate. For floating-rate instruments or zero-coupon bonds, use a more specific valuation method; zero-coupon bonds have no coupon and YTM equals the implied annualized return derived from price and maturity.
What are the limits and verification recommendations?
For high-precision needs (e.g., regulatory reporting, trade confirmations), verify results using a numerical solver against the bond price equation and cross-check with independent systems. Validate inputs (e.g., payment frequency and whether price is clean) and perform sensitivity tests around small price changes to detect numerical instability.
How is callable bond logic handled?
Provide the earliest call date and call price. The calculator computes an approximate YTC and compares it to approximate YTM; Yield to Worst returns the conservative lower value. This approach assumes a single call date input (earliest call) and does not model multiple call schedules.
Sources & citations
- National Institute of Standards and Technology (NIST) - Guidance on algorithm verification — https://www.nist.gov
- International Organization for Standardization (ISO) - Risk management and numerical quality principles — https://www.iso.org
- IEEE Standards Association - Recommended practices for numerical accuracy and floating point — https://ieee.org
- Occupational Safety and Health Administration (OSHA) - General workplace data and process controls (for operational compliance) — https://www.osha.gov
- U.S. Securities and Exchange Commission - Investor information on bonds — https://www.sec.gov
- SEC — Securities and Exchange Commission Yield Calculation Guidance — https://www.sec.gov/rules/proposed/482.txt
- FINRA — Fixed Income and Bonds — https://www.finra.org/investors/investing/investment-products/bonds
- U.S. Treasury — Treasury Securities — https://www.treasurydirect.gov/marketable-securities/
Further resources
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: e0b502b14ffdWhat changed (latest)
v1.0.0 • 2025-11-13 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-13 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 13, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-13 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 2521842d6bb1