Is there a way to weight the average in a sheet summary report?

I have a report that pulls from the sheet summaries of multiple sheets. One of the fields divides two other fields to show the % of items completed. However, when grouping & adding summaries to each column, the % completed summary averages the values below it rather than showing the actual % of items completed. In the screenshot below, I would like the % Items Closed column to display 67% (32 closed items/48 total items), not 59%.

Essentially I'm looking for a way to either calculate based on adjacent summary values or assign some sort of weight to each % value. Last resort would be setting up a metric sheet.

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