Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Calculating Fractions of Years.

Calculating Fractions of Years

by Allen Wyatt
(last updated May 10, 2019)

5

One of the types of data that Excel allows you to store is, of course, dates. At some point you may wish to perform some calculations with the dates in your worksheet. It is not uncommon to need to figure out the percentage of a year represented by the difference between two dates. Excel allows you to calculate this easily using the YEARFRAC worksheet function.

To use the function, all you need to do is provide two dates and a value that specifies how Excel should calculate the fractional year:

=YEARFRAC(DateOne, DateTwo, Basis)

The dates used by YEARFRAC can be either static dates, or they can be references to cells that contain dates. The Basis value ranges between 0 and 4, with 0 being the default. The following are the different meanings for the Basis:

Basis Meaning
0 US 30/360
1 Actual/actual
2 Actual/360
3 Actual/365
4 European 30/360

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (9366) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. You can find a version of this tip for the older menu interface of Excel here: Calculating Fractions of Years.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

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What is 0 + 2?

2019-06-05 17:37:19

John E Hains Jr

The "actual/actual" in Basis 1 is "actual days in the month"/365.25 in case anyone was as curious as I was.


2014-08-04 08:02:47

Bryan

If you are going to use the results of the calculation in another formula it would be better to use cell formatting to change the number of decimal places instead of using a formula. This way you are using full precision and you won't get rounding errors down the road.


2014-08-03 08:26:37

Bob Beechey

Ray's suggestion could be simplified with:
=ROUND(YEARFRAC(Date1, Date2, Basis),2)
The most accurate basis for most applications is 1 where the actual dates for each relevant month is divided by the actual number of days for the years concerned.


2014-08-02 09:58:06

Ray

To display 2dp: Format the cell to 2 decimal places.
If you want to round the result to 2dp use =(INT(C3*100+0.5))/100 where the number to be rounded is in C3.
Or you can combine as
=(INT((YEARFRAC(DateOne, DateTwo, Basis)*100+0.5))/100


2014-08-02 08:10:11

Pete

How can I adapt this formula so that the result is to just two decimal places?


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