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I have created a pivot table for the following data in excel:

enter image description here

But as you can see, the grand total is not being calculated correctly. What should I do to fix it? My second question is, how could I drop the duration column and use a formula in pivot table for that?

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It seems one should not really ask two separate questions in a single post. One queries time formats (extensively covered on Superuser (where queries of the nature of your post seems to belong) and the other deals with calculated fields in pivot tables (for which there are also many examples on SU). –  pnuts Oct 11 '12 at 12:21
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migrated from stackoverflow.com Oct 11 '12 at 14:38

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2 Answers

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I would guess you just need to format that cell (H5) as a time that can exceed 24 hours: http://support.microsoft.com/kb/266691 so you just need square brackets around the h in your custom formatting string.

For your second question, you need a calculated field. In 2010, click on the pivot table, go to the options tab in the ribbon, in the calculations group choose Fiels, Items & Set and then choose calculated field. I guess then you just need End Time - Start Time

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Use formatting as [h]:mm to the time field (Sum of Duration).

It worked for me, could for you as well.

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