Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Referencing the Last Six Items in a Formula.
Darryl needs to find the average of the last six entries in a column. The number of items in the column can vary over time as more information is added, but he always wants the average of those last six items.
There are a number of different formulas you can use, probably too many to go over here in detail. With that in mind, it is instructive to look at two particular formulas. The one you choose to use will depend on the characteristics of the data in the column. If there are no blank cells in the column, then finding the average can be done with a relatively simple formula:
=AVERAGE(OFFSET(A1,COUNT(A:A)-6,0,6,1))
This formula uses the OFFSET function to calculate the proper cells to examine, at the bottom of the column. This formula won't work if there are blank cells in the column. In that case you will need to use a formula that examines the contents of each cell and determines, as part of the calculation process, whether it is blank or not. Array formulas or regular formulas using array functions are great for this purpose. The following example uses the SUMPRODUCT function to accomplish the task:
=SUMPRODUCT((A1:A30*((MAX(ROW(A1:A30)*(A1:A30<>""))-ROW(A1:A30))<6))/6)
This formula assumes that the cells to be evaluated are in the range of A1:A30; it doesn't matter if there are blank cells in this range. The ROW functions are used to create arrays that determine if the individual cells contain values or not. Only those rows containing values end up being counted, and those are divided by 6 and summed, providing the desired average.
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (3370) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Referencing the Last Six Items in a Formula.
Program Successfully in Excel! John Walkenbach's name is synonymous with excellence in deciphering complex technical topics. With this comprehensive guide, "Mr. Spreadsheet" shows how to maximize your Excel experience using professional spreadsheet application development tips from his own personal bookshelf. Check out Excel 2013 Power Programming with VBA today!
If you have a bunch of ZIP Codes or part numbers in a list, you may want to "condense" the list so that sequential series of ...
Discover MoreWhen working with names or a different series of words, you may need to pull the initial letters from each word in the ...
Discover MoreISBN numbers are used to denote a unique identifier for a published book. If you remove the dashes included in an ISBN, you ...
Discover MoreFREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."
There are currently no comments for this tip. (Be the first to leave your comment—just use the simple form above!)
Got a version of Excel that uses the menu interface (Excel 97, Excel 2000, Excel 2002, or Excel 2003)? This site is for you! If you use a later version of Excel, visit our ExcelTips site focusing on the ribbon interface.
FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."
Copyright © 2017 Sharon Parq Associates, Inc.
Please Note:
This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: 
Comments