Bond Equivalent Yield Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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When comparing scenarios with Bond Equivalent Yield Calculator, consistency matters as much as the number itself. Applying the same formula to each set of displayed inputs makes the comparison easier to audit.

What this calculator does

Bond Equivalent Yield Calculator annualizes the holding-period return on a short-term discount instrument using a 365-day year. It works from face value at maturity, purchase price, and days to maturity. For Bond Equivalent Yield Calculator, the calculator does not pull live quotes or analyst estimates, which keeps the scenario reproducible with the numbers you supply.

How to use it

Start with Face value at maturity, Purchase price, and Days to maturity. Use the time unit shown for Days to maturity in Bond Equivalent Yield Calculator; do not silently switch between years, months, or days. Use one currency for all monetary fields in Bond Equivalent Yield Calculator; the currency selector formats the result and does not convert exchange rates. Before calculating, recheck Face value at maturity, Purchase price, Days to maturity against the source numbers you intend to analyze.

How the calculation works

BEY = [(face value − purchase price) ÷ purchase price] × (365 ÷ days to maturity). Bond Equivalent Yield Calculator substitutes the relevant form values into this equation without adding an unstated market assumption. For Bond Equivalent Yield Calculator, an unusual result is a reason to verify the entered values and the formula shown here before drawing a conclusion.

Example

Buying a $1,000 instrument for $980 with 90 days to maturity gives a holding-period return of about 2.04% and a bond-equivalent yield of about 8.28%. Use the same Bond Equivalent Yield Calculator steps with your own form values rather than treating the sample as a target.

How to interpret the result

BEY puts a short holding-period return onto a simple annualized basis, which can make discount instruments easier to compare with annual percentage quotes. For a clean comparison with Bond Equivalent Yield Calculator, keep the displayed input definitions and measurement basis consistent across scenarios.

Limitations and notes

This is a simple annualization, not an effective compound yield. It assumes the entered discount is realized at maturity and does not include reinvestment, transaction costs, taxes, default risk, or alternative day-count conventions. A fresh Bond Equivalent Yield Calculator calculation is appropriate whenever the values or timing represented by its displayed inputs change.