I am currently calculating the difference between created date and modified date in my SharePoint custom list.

Is it possible to also calculate the average of the # of days, totalled by month?

I am using Sharepoint 2013 on-premise with SharePoint Designer.


SharePoint does not natively provide rollup totals for calculated columns, but you do have some options on-prem.

You can get the total number of days between the two dates for each row with the following calculated column formula:


To emulate a rollup value, you will need to do some JavaScript trickery. This article provides a how-to create a javascript-based calculated "Total" column. You would of course need to modify the line of code the sets the var TotalSum= to calculate your average instead of a sum.

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