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Finance

How to Calculate the Bond Equivalent Yield

Patrick Harwood
· · Updated Jan 16, 2026 · 2 min read
There are 2 main ways to invest in a company; stocks or bonds. Stocks represent ownership and bonds represent debt for the company. One common calculation for measuring the annual return on a bond is the bond equivalent yield (BEY).

It is a way to turn a semi-annual, quarterly, or monthly paying bond yield into an annual bond yield, which allows investors to compare bond performance on equal terms.

 

5 Steps To Calculate The Bond Equivalent Yield

Bond Equivalent Yield

 

1. Review The Formula For Bey

The equation is: [(1000-Purchase Price)/Purchase Price)] x (365/days to maturity).

This assumes a par (stated) value of $1,000 which is the par value of most bonds.

 

2. Determine The Purchase Price

This is the price you paid for the bond. If you purchased at a "premium" it means the price is over par ($1,000), however, if you purchased the bond at a "discount" it means the price paid is under par. Let's assume you paid $950 for a bond.

 

3. Determine The Days Til Maturity

The days til maturity are the number of days before the bond matures. Let's say we have a bond with a maturity date of January 1, 2020 and the current date is January 1, 2015. This means we have 5 years until the bond mature or 1,825 days (365 x 5).

 

4. Calculate The Bey

Substitute the variables in purchase price and days til maturity into the equation. The equation is: [(1000-950)/950)] x (365/1825) = .0105. This is the simple (not compounded) rate of interest annualized.

 

5. Multiply The Answer By 100 For The Rate

For our example the answer is 1.05 percent.

 

You Might Also Like :: What Makes Bond Yields Go Up & Down?

 

How to Calculate the Bond Equivalent Yield

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Written by

Patrick Harwood

Patrick Harwood has been a professional writer and editor since 2004, specializing in articles about spectator sports, personal finance and law. He has contributed to family of magazines and websites.

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