I'm not sure why a custom calculation wouldn't work.
You may want to look at how Debra Dalgleish explains it:
http://contextures.com/xlPivot10.html
astrodon wrote:
I have five data items in a pivot table for which two are
1. Average of AdjustedPrice
2. Average of MarketPrice
Is it possible to create a formula that would show the difference of
these two summaries within the PivotTable?
(Field Settings | Options | Differnce From will not work for rows)

TIA
astrodon
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astrodon
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