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Editorial Team
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Asked: 2026-05-23T21:01:29+00:00

I need to calculate the average value for each month. Currently I have 2

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I need to calculate the average value for each month. Currently I have 2 columns “DATE” (date value e.g 01/01/2010) and AccOpen (number value). So for all dates within January I need to return the average value of all numbers contained in the corresponding AccOpen rows for January dates.

Is it possible to use the CALCULATED option and input a FORMULA that will return the average for all itmes within each months period (when adding a column to the list ?

DATE ACCOPEN AVERAGE
01/01/2010 2 2
02/01/2010 2
03/01/2010 2
04/01/2010 2
01/02/2010 2 2
02/02/2010 2
03/02/2010 2
04/02/2010 2

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1 Answer

  1. Editorial Team

    You’re not going to be able to do this OOTB without writing event receiver code (or other custom code running in a batch mode).

    To get you started

    This will need to hook into the list item update and then consolidate your list into a separate summary list with the calculations you need.

    The brute force approach would be to run the calculation afresh for every item in the group when an item is inserted/updated.

    A smarter approach would be to just update the delta (the difference between the old and the new record) which is easier to do if you store components of the calculation – so in your case

    Month – NumRecords – TotalValue

    and work out the Average on the fly (as its easy to delta the NumRecords/TotalValue but impossible to apply it directly to the average)

    One 3rd party web part which may fit your need is PivotPoint – it allows you to do things like sum/count/avg over groups like Month & Year (disclaimer – I work for the company)

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