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DURATION function: Description, Usage, Syntax, Examples and Explanation

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What is DURATION function in Excel?

DURATION function is one of the Financial functions in Microsoft Excel that returns the Macauley duration for an assumed par value of $100. Duration is defined as the weighted average of the present value of cash flows, and is used as a measure of a bond price’s response to changes in yield.

Syntax of DURATION function

DURATION(settlement, maturity, coupon, yld, frequency, [basis])

The DURATION function syntax has the following arguments:

  • Settlement: The security’s settlement date. The security settlement date is the date after the issue date when the security is traded to the buyer.
  • Maturity: The security’s maturity date. The maturity date is the date when the security expires.
  • Coupon: The security’s annual coupon rate.
  • Yld: The security’s annual yield.
  • Frequency: The number of coupon payments per year. For annual payments, frequency = 1; for semiannual, frequency = 2; for quarterly, frequency = 4.
  • Basis (Optional): The type of day count basis to use.
Basis Day count basis
0 or omitted US (NASD) 30/360
1 Actual/actual
2 Actual/360
3 Actual/365
4 European 30/360

DURATION formula explanation

  • Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2018 is serial number 43101 because it is 43,101 days after January 1, 1900.
  • The settlement date is the date a buyer purchases a coupon, such as a bond. The maturity date is the date when a coupon expires. For example, suppose a 30-year bond is issued on January 1, 2018, and is purchased by a buyer six months later. The issue date would be January 1, 2018, the settlement date would be July 1, 2018, and the maturity date would be January 1, 2048, which is 30 years after the January 1, 2018, issue date.
  • Settlement, maturity, frequency, and basis are truncated to integers.
  • If settlement or maturity is not a valid date, DURATION returns the #VALUE! error value.
  • If coupon < 0 or if yld < 0, DURATION returns the #NUM! error value.
  • If frequency is any number other than 1, 2, or 4, DURATION returns the #NUM! error value.
  • If basis < 0 or if basis > 4, DURATION returns the #NUM! error value.
  • If settlement ≥ maturity, DURATION returns the #NUM! error value.

Example of DURATION function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Data Description
07/01/2018 Settlement date
01/01/2048 Maturity date
8.0% Percent coupon
9.0% Percent yield
2 Frequency is semiannual (see above)
1 Actual/actual basis (see above)
Formula Description Result
=DURATION(A2,A3,A4,A5,A6,A7) The duration, for the bond with the terms above 10.9191453

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