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 Months of Tenure.
If you are in charge of tracking employees in your department or company, you might want to know if you can use Excel to calculate the months of tenure for those employees, given the date at which the employee started. This can be done very easily.
For the sake of this example, let's assume that column C contains the starting date for a list of employees. You could use the following formula in column D to determine each employee's tenure:
=DATEDIF(C3,NOW(),"M")
The DATEDIF function calculates the difference between a starting date and an ending date. The "M" used in the formula indicates that you want the result in completed months.
To calculate the average tenure for your series of employees, simply include the following formula at the bottom of column C:
=AVERAGE(C3:C174)
Of course, you should replace the range in the function (C3:C174) with the actual range of employee tenures as determined by the DATEDIF formula.
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (9605) 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 Months of Tenure.
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2019-09-10 19:35:46
Peter Atherton
Dave
The DATEDIF function is an old Lotus 123 function that Excel can use but there has never, I think, been any help on this function. However there is a very good page on this site, see:
https://excelribbon.tips.net/T011360_Elapsed_Days_as_Years_Months_and_Days.html The DATEDIF returns a string that is very easy to understand.
Excel's version is the YEARFRACT function. This reurn the difference as a decimal fraction and has the advantage that it is easy to do further calculations on the result. If you want to use it then check the help page as there are five options on calculating the result, so choosing the right basis is crucial to getting the answer you want.
2019-09-09 14:31:49
Dave Bonin
Oddly, there is no Excel Help for the DATEDIF() function. I wonder why. Is the function no longer supported or is it in an add-in?
Personally, if the calculation is not too critical, I tend to subtract the newer date from the older and then divide by 30.4. This gets me close enough for most purposes. It also works nicely for providing results in decimal months when the number of months is not exactly an integer.
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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: 
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