Calculations in Word are not dynamic. Try selecting the table then pressing F9.
To see how to do a wide range of calculations in Word, check out my Microsoft Word Field Maths Tutorial, at:
http://windowssecrets.com/forums/sho...Maths-Tutorial
or:
http://www.gmayor.com/downloads.htm#Third_party
To see how to do just about everything you might want to do with date calculations in Word, check out my Microsoft Word Date Calculation Tutorial, at:
http://windowssecrets.com/forums/sho...ation-Tutorial
or:
http://www.gmayor.com/downloads.htm#Third_party
Do read the document's introductory material.