While Word can do even complex calculations, they're far less straightforward than using Excel.

To see how to do a wide range of calculations in Word, check out my Microsoft Word Field Maths Tutorial: https://www.msofficeforums.com/word/...-tutorial.html

To see how to do just about every date-based calculation you might want to in Word, check out my Microsoft Word Date Calculation Tutorial: https://www.msofficeforums.com/word/...-tutorial.html
Do read the document's introductory material.

A better solution, though, might be to use an external workbook for the calculations, then link that to your Word document (i.e. copy the Excel data, then use Paste Special>Paste Link. Linking provides a number of display formats you can choose from and allows you to keep the document up to date with changes in the workbook.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]