DEFINITION of 'Modified Duration'
A formula that expresses the measurable change in the value of a security in response to a change in interest rates. Calculated as:
Where:
n = number of coupon periods per year
YTM = the bond's yield to maturity
INVESTOPEDIA EXPLAINS 'Modified Duration'
Modified duration follows the concept that interest rates and bond prices move in opposite directions. This formula is used to determine the effect that a 100basispoint (1%) change in interest rates will have on the price of a bond.
RELATED TERMS

Coupon
The interest rate stated on a bond when it's issued. The coupon ... 
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The calculation of a bond's duration based on historical data. ... 
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RELATED FAQS

How do I calculate a modified duration using Matlab?
The modified duration gauges the sensitivity of the fixed income securities to changes in interest rates. To calculate the ... Read Full Answer >> 
For what financial instruments is a modified duration relevant?
The modified duration is a formula used to calculate the percent change in the price of a financial instrument when there ... Read Full Answer >> 
What is the average profit margin of a company in the chemicals sector?
Macaulay duration and modified duration are used in fixed income markets to determine a bond's duration. The Macaulay duration ... Read Full Answer >> 
What level of return on equity is average for companies in the chemicals sector?
The modified duration is an adjusted version of the Macaulay duration and takes into account how interest rate fluctuations ... Read Full Answer >> 
What is the risk return tradeoff for bonds?
Macaulay duration and modified duration are mainly used to calculate the durations of bonds. The Macaulay duration calculates ... Read Full Answer >> 
What is the relationship between modified duration and interest rates?
Modified duration is a formula that measures the value of a bond in relation to changes in interest rates. Modified duration ... Read Full Answer >>
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